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Riley BJ, Canfield NL, Chong S, Crum JV. Metal-Encapsulated, Polymer-Containing Halide Salt Composites as Potential Long-Term Hosts for Radioiodine: Evaluating Halmets, Polyhalmets, and Halcermets. ACS OMEGA 2024; 9:34661-34674. [PMID: 39157085 PMCID: PMC11325406 DOI: 10.1021/acsomega.4c03378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 06/19/2024] [Accepted: 07/31/2024] [Indexed: 08/20/2024]
Abstract
This paper presents composite waste form concepts for radioiodine immobilization including halide-metal (halmet) composites, polymer-halide-metal (polyhalmet) composites, and halide-ceramic-metal (halcermet) composites with data from experiments to evaluate these ideas. The encapsulant metal of choice for the pellets was Bi0, and a cold-press-and-sinter approach was used for creating the pellets. A polymer (i.e., polyacrylonitrile or PAN) phase was included in some composite forms because this porous, passive polymer is used as a host matrix for active chemisorption-based getters. Metals of Ag0, Bi0, and Cu0 were separately embedded into PAN beads, which were loaded with iodine in static tests. Included are details of experiments where PAN removal from the iodine-loaded composite beads was evaluated to reduce the overall volume of the final waste requiring immobilization and to improve the thermal stability of the final composite form. While these experiments demonstrate new concepts for radioiodine immobilization, more work is needed to fully understand the limitations of these approaches and further optimizations are needed before implementation at larger scales is feasible.
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Affiliation(s)
- Brian J. Riley
- Pacific Northwest National
Laboratory, 902 Battelle Blvd. Richland, Washington 99354, United States
| | - Nathan L. Canfield
- Pacific Northwest National
Laboratory, 902 Battelle Blvd. Richland, Washington 99354, United States
| | - Saehwa Chong
- Pacific Northwest National
Laboratory, 902 Battelle Blvd. Richland, Washington 99354, United States
| | - Jarrod V. Crum
- Pacific Northwest National
Laboratory, 902 Battelle Blvd. Richland, Washington 99354, United States
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Wei Y, Dewji S. A comprehensive review of dose limits, triage systems and measurement tools for consequence management of nuclear and radiological emergencies. Radiat Phys Chem Oxf Engl 1993 2024; 217:111533. [PMID: 38882716 PMCID: PMC11170981 DOI: 10.1016/j.radphyschem.2024.111533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
During a radiological or nuclear emergency, occupational workers, members of the public, and emergency responders may be exposed to radionuclides, whether external or internal, through inhalation, ingestion, or wounds. In the case of internalized radiation exposure, prompt assessment of contamination is necessary to inform subsequent medical interventions. This review assembles the constituent considerations for managing nuclear and radiological incidents, focused on a parallel analysis of the evolution of radiation dose limits - notably in the emergency preparedness and response realm - alongside a discussion of triage systems and in vivo radionuclide detection tools. The review maps the development of international and national standards and regulations concerning radiation dose limits, illuminating how past incidents and accumulated knowledge have informed present emergency preparedness and response practices, specifically for internalized radiation. Additionally, the objectives and levels of radiation triage systems are explored in-depth, along with a global survey of practices and protocols. Finally, this review also focuses on in vivo detection systems and their capacities for radionuclide identification, prioritizing internalized gamma-emitting isotopes due to their broader relevance. Collectively, this study comprehensively addresses the intricacies of triage management following radiation emergencies, emphasizing the imperative for enhanced standardization and continued research in this critical domain.
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Affiliation(s)
- Y. Wei
- Nuclear and Radiological Engineering and Medical Physics Programs, Georgia Institute of Technology, 770 State Street NW, Atlanta, GA, 30332-0405, USA
| | - S.A. Dewji
- Nuclear and Radiological Engineering and Medical Physics Programs, Georgia Institute of Technology, 770 State Street NW, Atlanta, GA, 30332-0405, USA
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Kim E, Hashimoto S, Tani K, Naito M, Takashima Y, Ishikawa T, Yasumura S, Kamiya K, Kurihara O. Relationship between the Residual Cesium Body Contents and Individual Behaviors among Evacuees from Municipalities near the Fukushima Daiichi Nuclear Power Plant. HEALTH PHYSICS 2024; 126:141-150. [PMID: 38252947 DOI: 10.1097/hp.0000000000001781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
ABSTRACT To support estimations of early individual internal doses to residents who suffered from the 2011 accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP), we have sought to use whole-body counter (WBC) measurement results of subjects who lived in municipalities neighboring the FDNPP at the time of the accident. These WBC measurements started several months after the accident; the targeted radionuclides were 134Cs and 137Cs. Our previous study had analyzed the relationship between the residual Cs contents of individuals and evacuation behaviors in the period immediately after the accident for residents of Namie-town, one of the most radiologically affected municipalities. Those results suggested that the first major release event at the FDNPP on 12 March 2011 caused significant exposure, particularly to those who delayed evacuation on that day. The present study expanded its scope to include subjects from four towns neighboring the FDNPP (Namie, Futaba, Okuma, and Tomioka) to gather additional evidence of the exposure that took place on 12 March 2011. Additionally, we investigated the relationship between individual cesium doses and subjects' destinations following the largest release event on 15 March 2011. The study population was 1,145 adults. We first divided the subjects into two evacuation groups depending on the distance from the FDNPP and their evacuation whereabouts (25-km boundary) as of 15:00 on 12 March 2011: the G1 group (≥25 km) and the G2 group (<25 km). We further divided these two subject groups into seven subgroups based on the subjects' destinations as of 0:00 on 16 March 2011. Our four main findings are as follows. (1) The 137Cs detection rate was significantly different between the G1 and G2 groups of Namie-town and Futaba-town but not for those of Okuma-town and Tomioka-town. This result corresponds to the plume passage (flowing toward the northwest to the north) in the afternoon of 12 March 2011 and supports our previous study. (2) The upper-percentile committed effective doses (CEDs) of the G2 groups were higher than those of the G1 groups for all four towns, although the between-group difference varied with the town. The highest CEDs were found in the G2 group of Futaba-town, and the lowest CEDs were in the Namie-town G1 group: 0.16 mSv and 0.04 mSv at the 90th percentile, respectively. The CEDs for both the G1 and G2 groups were relatively high for Okuma-town and Tomioka-town compared to those of the G1 group of Namie-town, although the former subjects were expected to be less exposed on 12 March 2011 and then evacuated to remote places, as did the residents of the other towns. (3) The CEDs of the G1 subgroup that evacuated outside Fukushima Prefecture were extremely low, suggesting that these subjects were little exposed on both 12 and 15 March 2011. However, the CEDs of the same G1 subgroup were rather higher than those of the corresponding G2 subgroup for Futaba-town and Okuma-town. We thus speculate that the WBC measurements were likely to have been affected by the contamination occurring in the second-round temporary re-entry (except for the Namie-town residents). (4) The analyses of the Namie-town evacuees indicated that the area including the middle and northern parts of Fukushima Prefecture was relatively more affected by the major release event on 15 March 2011. In conclusion, the early cesium intake due to the FDNPP accident remained detectable in the WBC measurements of certain present subjects; however, further analyses of the available data are necessary for a full understanding of the WBC measurement results.
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Affiliation(s)
- Eunjoo Kim
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Shozo Hashimoto
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Kotaro Tani
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Masayuki Naito
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Yoshio Takashima
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Tetsuo Ishikawa
- Fukushima Medical University, 1-Hikarigaoka, Fukushima-city, Fukushima 960-1247, Japan
| | - Seiji Yasumura
- Fukushima Medical University, 1-Hikarigaoka, Fukushima-city, Fukushima 960-1247, Japan
| | | | - Osamu Kurihara
- National Institutes for Quantum Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
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Narita M, Tani K, Kunishima N, Kim E, Kurihara O. Uncertainties associated with direct thyroid measurements using an NaI(Tl) survey meter: the effect of anatomical differences among individuals. RADIATION PROTECTION DOSIMETRY 2023; 199:1802-1806. [PMID: 37819325 DOI: 10.1093/rpd/ncac265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 10/12/2022] [Accepted: 11/19/2022] [Indexed: 10/13/2023]
Abstract
Photon detectors utilised for direct thyroid measurements to determine the radioiodine content in the thyroid are normally calibrated using a phantom that mimics the human neck, including the thyroid. However, such measurements are necessarily subject to uncertainty because of the difference between the phantom and the real human subject and also the morphological differences among individuals. In this study, personal voxel phantoms were created from magnetic resonance images of the necks of 24 adult volunteers (15 males and 9 females), and numerical simulations using these phantoms were performed to examine the variation in a conversion factor (131I kBq in the thyroid per μSv h-1) for a conventional NaI(Tl) survey meter among the individuals and also to confirm the suitability of reference Japanese voxel phantoms as a calibration standard for such measurements. As a result, it was found that the conversion factor obtained from the reference Japanese male (female) phantom was 1.29 (1.18) times larger than the average conversion factor for the male (female) subjects, suggesting that the conversion factors of the reference Japanese adult male and female phantoms would generally overestimate the 131I thyroidal contents and that the thyroid volume would be one of the factors influencing the conversion factor. This study also revealed a wide difference in the thyroid volume among individuals, which would be of concern when performing specific dose assessments for heavily exposed persons.
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Affiliation(s)
- Masato Narita
- Naka Fusion Institute, National Institutes for Quantum Science and Technology, Ibaraki, Japan
| | - Kotaro Tani
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Naoaki Kunishima
- Department of Radiology, Self-Defense Forces Central Hospital, Tokyo, Japan
| | - Eunjoo Kim
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology, Chiba, Japan
| | - Osamu Kurihara
- National Institute of Radiological Sciences (NIRS), National Institutes for Quantum Science and Technology, Chiba, Japan
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Non-Toxic and Flexible Radiation-Shielding Composites Based on Natural Rubber Containing Elemental W Fillers for Efficient Shielding against X/γ-rays. Processes (Basel) 2023. [DOI: 10.3390/pr11030674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
Abstract
Conventional radiation-shielding composites usually contain lead, which results in high toxicity and poor portability. Tungsten (W) is an ideal radiation-shielding element that can replace lead due to its high atomic number and non-toxicity. In this work, radiation-shielding composites were prepared using natural rubber (NR) as a matrix and three different particle size powders, namely W, WO3 and WC, as fillers. The results show that, for X-rays, the linear attenuation coefficient of radiation-shielding composites based on natural rubber containing WC with a particle size of 50 μm (50 WC/NR) is 27.005 cm−1 at an X-ray tube voltage of 40 kV, which is more than 14 times the linear attenuation coefficient of NR. For γ-rays, a linear attenuation coefficient of 50 WC/NR achieves 8.320 cm−1 at 81 keV, which is over 55 times the linear attenuation coefficient of NR. In addition, 50 WC/NR had the highest elongation at break at 548.989% and had the lowest hardness at 62 HA. In summary, 50 WC/NR can be used as an alternative to traditional radiation-shielding materials containing lead and has wide application prospects.
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The effect of exposure on cattle thyroid after the Fukushima Daiichi nuclear power plant accident. Sci Rep 2022; 12:21754. [PMID: 36526648 PMCID: PMC9758204 DOI: 10.1038/s41598-022-25269-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 11/28/2022] [Indexed: 12/23/2022] Open
Abstract
Nuclear plant accidents can be a risk for thyroid cancer due to iodine radioisotopes. Near the Fukushima Daiichi nuclear power plant, cattle were exposed to radiation after the accident occurred in May 2011. Here we estimated the total radiation exposure to cattle thyroid and its effects on thyroid function. Until October 2016, the estimated external exposure dose in Farm A was 1416 mGy, while internal exposure dose of 131I, 134Cs, and 137Cs were 85, 8.8, and 9.7 mGy in Farm A and 34, 0.2, and 0.3 mGy in Farm B, respectively. The exposed cattle had thyroid with relatively lower weight and lower level of stable iodine, which did not exhibit any pathological findings. Compared with the control, the plasma level of thyroid-stimulating hormone (TSH) was higher in Farm A cattle born before the accident, while the plasma thyroxine (T4) was higher in Farm A cattle born after the accident, suggesting that exposed cattle showed slight hyperactivation of the thyroid gland. In addition, Farm A cattle have higher level of cortisol, one of the anterior pituitary gland-derived hormones. However, we did not observe a causal relationship between the radiation exposure and cattle thyroid.
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Suzuki G, Ishikawa T, Ohba T, Hasegawa A, Nagai H, Miyatake H, Yoshizawa N. Estimation of children's thyroid equivalent doses in 16 municipalities after the Fukushima Daiichi Nuclear Power Station accident. JOURNAL OF RADIATION RESEARCH 2022; 63:796-804. [PMID: 36109336 PMCID: PMC9726711 DOI: 10.1093/jrr/rrac058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 07/26/2022] [Indexed: 06/15/2023]
Abstract
To elucidate the association between radiation dose and thyroid cancer after the 2011 Fukushima Daiichi Nuclear Power Station (FDNPS) accident, it is essential to estimate individual thyroid equivalent doses (TEDs) to children. In a previous study, we reported a methodology for reconstructing TEDs from inhalation. That methodology was based on individual behavioral survey sheets of the Fukushima Health Management Survey (FHMS) combined with a spatiotemporal radionuclides database constructed by an atmospheric transport, diffusion, and deposition model (ATDM)-the Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI) in seven municipalities. In the present study, we further refined our methodology and estimated the combined TEDs from inhalation and ingestion among children in 16 municipalities around the nuclear power station utilizing 3256 individual whereabouts questionnaire survey sheets. Distributions of estimated TEDs were similar to estimates based on direct thyroid measurements in 1080 children in Iwaki City, Kawamata Town, Iitate Village, and Minamisoma City. Mean TEDs in 1-year-old children ranged from 1.3 mSv in Date City to 14.9 mSv in Odaka Ward in Minamisoma City, and the 95th percentiles varied from 2.3 mSv in Date City to 28.8 mSv in Namie Town. In the future, this methodology can be useful for the epidemiological studies of thyroid cancer after the FDNPS accident.
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Affiliation(s)
- Gen Suzuki
- Correspondence author: Kitakanemaru, Ohtawara City, Tochigi Prefecture, 324-8501, Japan. , Tel: +81-0287-24-1001, FAX: +81-0287-24-1003)
| | - Tetsuo Ishikawa
- Radiation Medical Science Centre for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1247, Japan
- Department of Radiation Physics and Chemistry, School of Medicine, Fukushima Medical University, Fukushima 960-1247, Japan
| | - Takashi Ohba
- Department of Radiation Health Management, School of Medicine, Fukushima Medical University, Fukushima 960-1247, Japan
| | - Arifumi Hasegawa
- Department of Radiation Disaster Medicine, School of Medicine, Fukushima Medical University, Fukushima 960-1247, Japan
| | - Haruyasu Nagai
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
| | - Hirokazu Miyatake
- Societal Safety and Industrial Innovation Division, Mitsubishi Research Institute, Inc., Tokyo 100-8141, Japan
| | - Nobuaki Yoshizawa
- Societal Safety and Industrial Innovation Division, Mitsubishi Research Institute, Inc., Tokyo 100-8141, Japan
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Riley BJ, Chong S, Schmid J, Marcial J, Nienhuis ET, Bera MK, Lee S, Canfield NL, Kim S, Derewinski MA, Motkuri RK. Role of Zeolite Structural Properties toward Iodine Capture: A Head-to-head Evaluation of Framework Type and Chemical Composition. ACS APPLIED MATERIALS & INTERFACES 2022; 14:18439-18452. [PMID: 35412785 DOI: 10.1021/acsami.2c01179] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This study evaluated zeolite-based sorbents for iodine gas [I2(g)] capture. Based on the framework structures and porosities, five zeolites, including two faujasite (FAU), one ZSM-5 (MFI), one mesoMFI, one ZSM-22 (TON), as well as two mesoporous materials, were evaluated for I2(g) capture at room temperature and 150 °C in an iodine-saturated environment. From these preliminary studies, the three best-performing zeolites were ion-exchanged with Ag+ and evaluated for I2(g) capture under similar conditions. Energy-dispersive X-ray spectroscopy data suggest that Ag-FAU frameworks were the materials with the highest capacity for I2(g) in this study, showing ∼3× higher adsorption compared to Ag-mordenite (Ag-MOR) at room temperature, but X-ray diffraction measurements show that the faujasite structure collapsed during the adsorption studies because of dealumination. The Ag-MFI zeolites are decent sorbents in real-life applications, showing both good sorption capacities and higher stability. In-depth analyses and characterizations, including synchrotron X-ray absorption spectroscopy, revealed the influence of structural and chemical properties of zeolites on the performance for iodine adsorption from the gas phase.
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Affiliation(s)
- Brian J Riley
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Saehwa Chong
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Julian Schmid
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - José Marcial
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Emily T Nienhuis
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Mrinal K Bera
- NSF's ChemMatCARS, Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States
| | - Sungsik Lee
- X-Ray Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Nathan L Canfield
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Sungmin Kim
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Miroslaw A Derewinski
- Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Cracow, Poland
| | - Radha Kishan Motkuri
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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Kim E, Igarashi Y, Hashimoto S, Tani K, Ishikawa T, Kowatari M, Kurihara O. Estimation of the Early Cs-137 Intake of Evacuees from Areas Affected by the 2011 Fukushima Daiichi Nuclear Power Plant Accident Based on Personal Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation. HEALTH PHYSICS 2021; 121:133-149. [PMID: 34028388 DOI: 10.1097/hp.0000000000001429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
ABSTRACT More than 9 y have passed since the 2011 nuclear disaster in Fukushima Prefecture, Japan. During this period, much effort has been spent on the dose reconstruction for Fukushima residents; however, the estimation of the internal dose due to the potential intake of the short-lived radionuclides (mainly iodine-131) has been challenging because of the lack of direct human measurements at the early phase of the accident. Our previous study revealed that the residual cesium body contents observed in delayed whole-body counter (WBC) measurements of residents from Namie-town, one of the most affected municipalities, varied greatly with the timepoint of their evacuations on 12 March 2011 when the first explosive event occurred at the accident site; i.e., the late evacuees had much higher residual cesium body contents compared to the prompt evacuees. The present study thus aimed to clarify this finding by reproducing the exposure situation based on the evacuees' personal behavioral data in combination with the latest atmospheric transport and dispersion model (ATDM) simulation for 356 selected subjects in adult and 15-y (13-17 y) age groups. The results demonstrated that the ATDM simulation-based method could reasonably reproduce the subjects' exposure situation, supporting the previous finding. However, the residual cesium-137 body contents calculated by this method were only 10%-20% of those in the subjects' WBC measurements. This large discrepancy was considered to be caused by both the present method's underestimation and the overestimation of the subjects' early intake in the WBC measurements due to a conservative intake scenario not assuming potential additional intake. Additional studies are needed to further clarify the reasons for the discrepancy and to evaluate the magnitude of the inhalation dose in the accident.
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Affiliation(s)
- Eunjoo Kim
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | | | - Shozo Hashimoto
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Kotaro Tani
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Tetsuo Ishikawa
- Fukushima Medical University, 1-Hikarigaoka, Fukushima-city, Fukushima, Japan
| | - Munehiko Kowatari
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Osamu Kurihara
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
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Tani K, Igarashi Y, Kim E, Kowatari M, Iimoto T, Kurihara O. PROBABILISTIC ANALYSES OF 131I THYROID ACTIVITY IN PERSONS WITH SURFACE CONTAMINATION IN DIRECT MEASUREMENT WITH A STANDING-TYPE WHOLE-BODY COUNTER AS AN EMERGENCY RESPONSE IN A RADIOLOGICAL INCIDENT. RADIATION PROTECTION DOSIMETRY 2021; 194:65-75. [PMID: 34027550 DOI: 10.1093/rpd/ncab074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/23/2021] [Accepted: 04/24/2021] [Indexed: 06/12/2023]
Abstract
The authors' previous study suggested that a simple standing-type whole-body counter called FASTSCAN (Canberra, Meriden, CT, USA), widely installed throughout Japan after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in March 2011, could be used for thyroid measurements in internal dose assessment after a future radiological incident accompanied by the release of 131I into the environment. The present study performed Monte-Carlo simulations using a computational human phantom with several patterns of body surface contamination and used the results to formulate a method for probabilistic analyses of 131I thyroid activity in persons with surface contamination. The major advantage of this method is that the upper limit of the thyroid activity can be determined from the relative frequency distribution without identifying where body surface contamination remains. Therefore, this method is especially effective for use in the early phase of a radiological incident when time and resources are limited, making it difficult to physically remove all body surface contamination for the purpose of gaining more accurate population-wide thyroid screening measurements. As a case study of the FDNPP accident, the proposed method was applied to the results of in vivo measurements for a male subject with body surface contamination. In comparing the probabilistic analyses before and after removal of the subject's contaminated work clothes, the uncertainty of the relative frequency distribution of 131I thyroid activity was reduced by their removal. Therefore, in terms of accurate estimates and avoidance of radiation exposure from their contaminated clothes, efforts to remove body surface contamination still should be made as much as possible in the chaotic situation of the early phase of a radiological incident.
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Affiliation(s)
- Kotaro Tani
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Yu Igarashi
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
- Department of Environment Systems, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8563, Japan
| | - Eunjoo Kim
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Munehiko Kowatari
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
| | - Takeshi Iimoto
- Department of Environment Systems, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8563, Japan
| | - Osamu Kurihara
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan
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11
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Kim E, Yajima K, Igarashi Y, Tani K, Hashimoto S, Nakano T, Akashi M, Kurihara O. Intake Ratio of 131I to 137CS Derived from Thyroid and Whole-body Doses to Residents of Iwaki City in Japan's Fukushima Prefecture. HEALTH PHYSICS 2021; 120:387-399. [PMID: 33229943 DOI: 10.1097/hp.0000000000001345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
ABSTRACT It is very important to determine the precise internal thyroid doses of Fukushima residents involved in the 2011 Fukushima nuclear disaster, particularly for small children. This has been challenging due to the lack of direct human measurements to identify 131I, the biggest contributor to the thyroid doses. We previously used a dataset of late whole-body counter (WBC) measurements targeting 134Cs and 137Cs for the thyroid dose estimation in comparison with the intake ratios of 131I to 137Cs (or 134Cs) derived from thyroid and whole-body doses individually obtained from different subject groups, assuming simultaneous acute intake via inhalation. Herein, we applied the same method to the doses of residents in Iwaki city (located south of the Fukushima Daiichi Nuclear Power Plant) with a relatively high activity ratio (131I/137Cs) for the ground deposition density. Our analyses revealed that the intake ratio (131I/137Cs) for the Iwaki residents was 4.2-4.3, which is relatively consistent with the values obtained in other studies (average 3.0-5.0). No regional difference in the intake ratios from other areas was observed, but further studies are required to determine the accurate intake ratio in the early phase of the accident, in particular focusing on the reasonable interpretation of results of the late WBC measurements to evaluate the actual Cs intake.
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Affiliation(s)
- Eunjoo Kim
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Kazuaki Yajima
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | | | - Kotaro Tani
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Shozo Hashimoto
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | - Takashi Nakano
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
| | | | - Osamu Kurihara
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba 263-8555, Japan
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Ogura K, Hosoda M, Tamakuma Y, Suzuki T, Yamada R, Negami R, Tsujiguchi T, Yamaguchi M, Shiroma Y, Iwaoka K, Akata N, Shimizu M, Kashiwakura I, Tokonami S. Discriminative Measurement of Absorbed Dose Rates in Air from Natural and Artificial Radionuclides in Namie Town, Fukushima Prefecture. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18030978. [PMID: 33499401 PMCID: PMC7908574 DOI: 10.3390/ijerph18030978] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/17/2021] [Accepted: 01/18/2021] [Indexed: 11/16/2022]
Abstract
Ten years have elapsed since the accident at the Fukushima Daiichi Nuclear Power Plant in 2011, and the relative contribution of natural radiation is increasing in Fukushima Prefecture due to the reduced dose of artificial radiation. In order to accurately determine the effective dose of exposure to artificial radiation, it is necessary to evaluate the effective dose of natural as well as artificial components. In this study, we measured the gamma-ray pulse-height distribution over the accessible area of Namie Town, Fukushima Prefecture, and evaluated the annual effective dose of external exposure by distinguishing between natural and artificial radionuclides. The estimated median (range) of absorbed dose rates in air from artificial radionuclides as of 1 April 2020, is 133 (67–511) nGy h−1 in the evacuation order cancellation zone, and 1306 (892–2081) nGy h−1 in the difficult-to-return zone. The median annual effective doses of external exposures from natural and artificial radionuclides were found to be 0.19 and 0.40 mSv in the evacuation order cancellation zone, and 0.25 and 3.9 mSv in the difficult-to-return zone. The latest annual effective dose of external exposure discriminated into natural and artificial radionuclides is expected to be utilized for radiation risk communication.
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Affiliation(s)
- Koya Ogura
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Masahiro Hosoda
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (N.A.); (M.S.)
| | - Yuki Tamakuma
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (N.A.); (M.S.)
| | - Takahito Suzuki
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Ryohei Yamada
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Ryoju Negami
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Takakiyo Tsujiguchi
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Masaru Yamaguchi
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Yoshitaka Shiroma
- Faculty of Education, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan;
| | - Kazuki Iwaoka
- National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage, Chiba 263-0024, Japan;
| | - Naofumi Akata
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (N.A.); (M.S.)
| | - Mayumi Shimizu
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (N.A.); (M.S.)
| | - Ikuo Kashiwakura
- Graduate School of Health Sciences, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (K.O.); (M.H.); (Y.T.); (T.S.); (R.Y.); (R.N.); (T.T.); (M.Y.); (I.K.)
| | - Shinji Tokonami
- Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan; (N.A.); (M.S.)
- Correspondence:
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Sakamoto A, Matsuzuka T, Yamaya Y, Suzuki S, Iwadate M, Suzuki S, Hashimoto Y, Suzuki O, Suzuki S, Yokoya S, Ohira T, Yasumura S, Ohto H, Kamiya K, Shimura H. Cytological examination of the thyroid in children and adolescents after the Fukushima Nuclear Power Plant accident: the Fukushima Health Management Survey. Endocr J 2020; 67:1233-1238. [PMID: 32814723 DOI: 10.1507/endocrj.ej20-0235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The Fukushima Daiichi Nuclear Power Plant accident occurred on March 11 2011, following the Great East Japan Earthquake and tsunami. Radioactive materials, including I-131, were released into the environment after the accident. Shortly after, the prefectural government initiated the Fukushima Health Management Survey for monitoring the long-term health conditions of the residents of Fukushima Prefecture. In the survey, thyroid ultrasonography was scheduled for all people aged 18 years or younger who were living in Fukushima Prefecture at the time of disaster. The total number of examinees was approximately 370,000 in the Preliminary Baseline Survey (PBLS), and 380,000 in the first Full-scale Survey (FSS). First, thyroid ultrasonography was performed as the Primary Examination. When a thyroid nodule that meets the fine needle aspiration cytology (FNAC) guideline is detected, thyroid FNAC is performed. By the end of June 2017, the cytological specimens of 187 examinees had been interpreted as Malignant or Suspicious for Malignancy (SFM). In this article, the cytological results of whole categories are presented using the criteria of The Bethesda System for Reporting Thyroid Cytopathology. The total numbers of examinees with SFM or Malignant in PBLS and at the first FSS were 106 (62.0%) and 71 (38.0%), respectively. The data of the cytological results of SFM and Malignant were already reported. However, this is the first report of cytological data from categories other than SFM and Malignant. The results of the current study will contribute to future research into the thyroid conditions of children and adolescents.
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Affiliation(s)
- Atsuhiko Sakamoto
- Thyroid Examination Expert Committee, Diagnostic Criteria Subcommittee for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
- Department of Pathology and Laboratory Medicine, Omori Red Cross Hospital, Tokyo 143-8527, Japan
| | - Takashi Matsuzuka
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Yukie Yamaya
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Satoru Suzuki
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Manabu Iwadate
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
- Department of Thyroid and Endocrinology, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Satoshi Suzuki
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
- Department of Thyroid and Endocrinology, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Yuko Hashimoto
- Department of Pathology, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Osamu Suzuki
- Department of Pathology, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Shinichi Suzuki
- Department of Thyroid and Endocrinology, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Susumu Yokoya
- The Thyroid and Endocrine Center, Fukushima Medical University Hospital, Fukushima 960-1295, Japan
| | - Tetsuya Ohira
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Seiji Yasumura
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Hitoshi Ohto
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
| | - Kenji Kamiya
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
- Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima 734-8553, Japan
| | - Hiroki Shimura
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima 960-1295, Japan
- Department of Laboratory Medicine, Fukushima Medical University, Fukushima 960-1295, Japan
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External Radiation Dose, Obesity, and Risk of Childhood Thyroid Cancer After the Fukushima Daiichi Nuclear Power Plant Accident: The Fukushima Health Management Survey. Epidemiology 2020; 30:853-860. [PMID: 31259849 DOI: 10.1097/ede.0000000000001058] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND The 2011 Great East Japan Earthquake led to a nuclear accident at Fukushima Daiichi Nuclear Power Plant. This study examines the associations of radiation dose and lifestyle factors with incidence of thyroid cancer in Fukushima. METHODS We designed a prospective study with 300,473 participants aged 18 years or younger, who underwent thyroid examinations from October 2011. Follow-up surveys were conducted through June 2017, and 245,530 participants (123,480 men and 122,050 women, 82% follow-up) received follow-up examinations. Fukushima Prefecture was divided into five areas based on individual external radiation dose. We calculated relative risks and 95% confidence intervals (CIs) for thyroid cancer in each area, with area of lowest dose as reference, using age-adjusted Poisson regression models. We also calculated risks associated with overweight and obesity. RESULTS The incidence per 100,000 for Groups A (highest dose), B, C, D, and E (lowest dose) were 13.5, 19.2, 17.3, 9.0, and 8.3, respectively. Compared with Group E, the age-adjusted risks (95% CIs) were 1.62 (0.59, 4.47) for group A, 2.32 (0.86, 6.24) for group B, 2.21 (0.82, 5.94) for group C, and 1.02 (0.36, 2.86) for group D. Obesity was positively associated with thyroid cancer incidence; the multivariable-adjusted risk of thyroid cancer was 2.23 (1.01, 4.90) for obese individuals compared with nonobese individuals. CONCLUSION Regional differences in radiation dose were not associated with increased risk of thyroid cancer among children in Fukushima within 4 to 6 years after the nuclear power plant accident. Obesity may be an important factor for further follow-up in Fukushima.
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Collett G, Craenen K, Young W, Gilhooly M, Anderson RM. The psychological consequences of (perceived) ionizing radiation exposure: a review on its role in radiation-induced cognitive dysfunction. Int J Radiat Biol 2020; 96:1104-1118. [PMID: 32716221 DOI: 10.1080/09553002.2020.1793017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE Exposure to ionizing radiation following environmental contamination (e.g., the Chernobyl and Fukushima nuclear accidents), radiotherapy and diagnostics, occupational roles and space travel has been identified as a possible risk-factor for cognitive dysfunction. The deleterious effects of high doses (≥1.0 Gy) on cognitive functioning are fairly well-understood, while the consequences of low (≤0.1 Gy) and moderate doses (0.1-1.0 Gy) have been receiving more research interest over the past decade. In addition to any impact of actual exposure on cognitive functioning, the persistent psychological stress arising from perceived exposure, particularly following nuclear accidents, may itself impact cognitive functioning. In this review we offer a novel interdisciplinary stance on the cognitive impact of radiation exposure, considering psychological and epidemiological observations of different exposure scenarios such as atomic bombings, nuclear accidents, occupational and medical exposures while accounting for differences in dose, rate of exposure and exposure type. The purpose is to address the question that perceived radiation exposure - even where the actual absorbed dose is 0.0 Gy above background dose - can result in psychological stress, which could in turn lead to cognitive dysfunction. In addition, we highlight the interplay between the mechanisms of perceived exposure (i.e., stress) and actual exposure (i.e., radiation-induced cellular damage), in the generation of radiation-induced cognitive dysfunction. In all, we offer a comprehensive and objective review addressing the potential for cognitive defects in the context of low- and moderate-dose IR exposures. CONCLUSIONS Overall the evidence shows prenatal exposure to low and moderate doses to be detrimental to brain development and subsequent cognitive functioning, however the evidence for adolescent and adult low- and moderate-dose exposure remains uncertain. The persistent psychological stress following accidental exposure to low-doses in adulthood may pose a greater threat to our cognitive functioning. Indeed, the psychological implications for instructed cohorts (e.g., astronauts and radiotherapy patients) is less clear and warrants further investigation. Nonetheless, the psychosocial consequences of low- and moderate-dose exposure must be carefully considered when evaluating radiation effects on cognitive functioning, and to avoid unnecessary harm when planning public health response strategies.
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Affiliation(s)
- George Collett
- Centre for Health Effects of Radiological and Chemical Agents, Institute of Environment, Health and Societies, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - Kai Craenen
- Centre for Health Effects of Radiological and Chemical Agents, Institute of Environment, Health and Societies, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - William Young
- Centre for Health Effects of Radiological and Chemical Agents, Institute of Environment, Health and Societies, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - Mary Gilhooly
- Centre for Health Effects of Radiological and Chemical Agents, Institute of Environment, Health and Societies, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
| | - Rhona M Anderson
- Centre for Health Effects of Radiological and Chemical Agents, Institute of Environment, Health and Societies, College of Health and Life Sciences, Brunel University London, Uxbridge, UK
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16
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Monte-Carlo simulations with mathematical phantoms to investigate the effectiveness of a whole-body counter for thyroid measurement. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106335] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Takagi M, Ohara T, Goto D, Morino Y, Uchida J, Sekiyama TT, Nakayama SF, Ebihara M, Oura Y, Nakajima T, Tsuruta H, Moriguchi Y. Reassessment of early 131I inhalation doses by the Fukushima nuclear accident based on atmospheric 137Cs and 131I/ 137Cs observation data and multi-ensemble of atmospheric transport and deposition models. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY 2020; 218:106233. [PMID: 32421570 DOI: 10.1016/j.jenvrad.2020.106233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 02/08/2020] [Accepted: 03/02/2020] [Indexed: 06/11/2023]
Abstract
The Fukushima Dai-ichi Nuclear Power Plant accidents following the March 11, 2011 Tohoku earthquake, and subsequent tsunami released radioactive materials into the atmosphere and caused significant public health concerns, particularly thyroid cancers in children. However, the lack of measurement data for atmospheric concentrations of 131I has caused persistent and widespread uncertainty. This study estimated the maximum potential thyroid doses of inhaled 131I in the early post-accident phase between March 12 and 23, 2011 by using the hourly measured data of the 137Cs concentrations at 101 suspended particulate matter (SPM) monitoring sites, a new multi-model ensemble (MME) method of simulating 137Cs concentrations using two Atmospheric Transport and Deposition Models (ATDMs), the 131I/137Cs ratio obtained from measurement data analysis, and the internal exposure model. Based on the measurements, the maximum potential thyroid doses were estimated at 3.1-160 mSv at 5 sites in the Fukushima-Hamadori area for 1-year-old children assumed to remain outdoors, whereas they were less than 4.3 mSv at the other sites in the base case of the 131I/137Cs ratio. The spatial distribution of the maximum potential of early inhalation doses was estimated by using the MME and measurements. The inhalation thyroid doses in the evacuation scenarios were compared to the estimates reported by previous studies. The results of the present study were almost congruent with the outcomes of previous investigations except for thyroid doses contributed by highly contaminated plumes on March 12 and 15. The sensitivity analysis for the 131I/137Cs ratio indicated that these plumes carried the potential to significantly increase the thyroid doses of residents.
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Affiliation(s)
- Mai Takagi
- Fukushima Branch, National Institute for Environmental Studies, 10-2 Fukasaku Miharu Town, Fukushima, 963-7700, Japan; National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan.
| | - Toshimasa Ohara
- Fukushima Branch, National Institute for Environmental Studies, 10-2 Fukasaku Miharu Town, Fukushima, 963-7700, Japan; National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
| | - Daisuke Goto
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
| | - Yu Morino
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
| | - Junya Uchida
- Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, 277-8568, Japan
| | | | - Shoji F Nakayama
- National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan
| | - Mitsuru Ebihara
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo, 192-0397, Japan; Department of Earth Sciences, Waseda University, 1-6-1 Nishi-Waseda, Shinjuku-ku, Tokyo, 192-8050, Japan
| | - Yasuji Oura
- Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachioji, Tokyo, 192-0397, Japan
| | - Teruyuki Nakajima
- Earth Observation Research Center, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki, 305-8505, Japan
| | - Haruo Tsuruta
- Remote Sensing Technology Center of Japan, 3-17-1 Toranomon, Minato-ku, Tokyo, 105-0001, Japan
| | - Yuichi Moriguchi
- Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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18
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Yajima K, Kim E, Tani K, Kurihara O. A new thyroid monitor using multiple high resolution Gd3(Al,Ga)5O12(Ce) detectors for direct thyroid measurements of small children following a nuclear accident. RADIAT MEAS 2020. [DOI: 10.1016/j.radmeas.2020.106272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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19
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Ohba T, Ishikawa T, Nagai H, Tokonami S, Hasegawa A, Suzuki G. Reconstruction of residents' thyroid equivalent doses from internal radionuclides after the Fukushima Daiichi nuclear power station accident. Sci Rep 2020; 10:3639. [PMID: 32107431 PMCID: PMC7046762 DOI: 10.1038/s41598-020-60453-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 02/12/2020] [Indexed: 12/11/2022] Open
Abstract
There is concern among residents that their children might suffer from thyroid cancer in the near future after the Fukushima Daiichi nuclear power station (FDNPS) accident. However, the demographic and geographical distribution of thyroid equivalent doses was not thoroughly evaluated, and direct thyroid measurements were conducted only for 1,200 children, whose individual thyroid doses were assessed on the basis of those measurements accounting for the dynamics of radioiodine intake. We conducted hierarchical clustering analyses of 100 or 300 randomly sampled behavioural questionnaire sheets of children from each of seven municipalities in the evacuation area to reconstruct evacuation scenarios associated with high or low exposures to plumes. In total 896 behaviour records in the Fukushima Health Management Survey were analysed to estimate thyroid equivalent doses via inhalation, using a spatiotemporal radionuclides concentration database constructed by atmospheric dispersion simulations. After a decontamination factor for sheltering and a modifying factor for the dose coefficient-to reflect lower iodine uptake rate in Japanese-were applied, estimated thyroid equivalent doses were close to those estimated from direct thyroid measurement. The median and 95th percentile of thyroid equivalent doses of 1-year-old children ranged from 0.6 to 16 mSv and from 7.5 to 30 mSv, respectively. These results are useful for future epidemiological studies of thyroid cancer in Fukushima.
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Affiliation(s)
- Takashi Ohba
- Department of Radiation Health Management, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 9601295, Japan
| | - Tetsuo Ishikawa
- Radiation Medical Science Centre for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 9601295, Japan
- Department of Radiation Physics and Chemistry, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 9601295, Japan
| | - Haruyasu Nagai
- Environment and Radiation Science Division, Japan Atomic Energy Agency, Tokai-village, Ibaraki, 3191195, Japan
| | - Shinji Tokonami
- Department of Radiation Physics, Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki-city, Aomori, 0368564, Japan
| | - Arifumi Hasegawa
- Department of Radiation Disaster Medicine, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 9601295, Japan
| | - Gen Suzuki
- International University of Health and Welfare Clinic, Ohtawara-city, Tochigi, 3248501, Japan.
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20
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Kim E, Yajima K, Hashimoto S, Tani K, Igarashi Y, Iimoto T, Ishigure N, Tatsuzaki H, Akashi M, Kurihara O. Reassessment of Internal Thyroid Doses to 1,080 Children Examined in a Screening Survey after the 2011 Fukushima Nuclear Disaster. HEALTH PHYSICS 2020; 118:36-52. [PMID: 31318730 DOI: 10.1097/hp.0000000000001125] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The dose reconstruction of populations potentially affected by the accident at the Fukushima Daiichi nuclear power plant in March 2011 is of great importance. However, it has been difficult to assess internal thyroid doses to Fukushima residents (mainly from their intake of I) due to the lack of direct measurements. For the residents, only about 1,300 data points related to I are available, and 1,080 of the data points were obtained from the screening campaign that was conducted by the Nuclear Emergency Response Local Headquarters at the end of March 2011 in Kawamata Town, Iwaki City, and Iitate Village. Here, we reassessed thyroid doses to 1,080 subjects aged ≤15 y old using new age-specific conversion factors to determine I thyroid contents from net signals of the devices used, with consideration for the possible uncertainty related to the measurements. The results demonstrated that thyroid equivalent doses to the subjects were <30 mSv (excluding outliers). We also demonstrate dose distributions of each age group from the above three municipalities and those of subjects from Minamisoma City and Fukushima City. One of the findings was that the I intake was similar among different age groups in each of the three municipalities. This was consistent with the assumption that ingestion was a dominant route of intake rather than inhalation. The range of thyroid doses to Iitate Village residents was similar to that to Iwaki City residents even though the I concentration in tap water was much higher in Iitate Village than Iwaki City. The range of thyroid doses to Minamisoma City residents was similar to that to Iitate Village and Iwaki City residents, and the range for Fukushima City residents was smallest among the five municipalities. Since the major route of intake has remained unclear, this paper presents the plausible upper and lower thyroid doses, between which the actual doses are thought to mostly exist, based on two intake scenarios: single inhalation and repeated ingestion. Further research is thus necessary to extract useful evidence from the individual evacuation behaviors for improving the present internal thyroid dose assessment.
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Affiliation(s)
- Eunjoo Kim
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Kazuaki Yajima
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Shozo Hashimoto
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Kotaro Tani
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | | | | | - Nobuhito Ishigure
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Hideo Tatsuzaki
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Makoto Akashi
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - Osamu Kurihara
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
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21
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Tani K, Kunishima N, Igarashi Y, Kim E, Iimoto T, Kurihara O. MCNP SIMULATIONS WITH A PERSONALISED VOXEL PHANTOM TO VERIFY 131I CONTENT IN THYROID ESTIMATED BASED ON MEASUREMENTS WITH AN NaI(Tl) SPECTROMETER. RADIATION PROTECTION DOSIMETRY 2019; 185:402-408. [PMID: 30806469 DOI: 10.1093/rpd/ncz020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 01/09/2019] [Accepted: 01/31/2019] [Indexed: 06/09/2023]
Abstract
One of the authors (O.K.) stayed in the area located ~110 km south from the Fukushima Daiichi Nuclear Power Plant during the arrival of radioactive plumes released into the environment due to the accident in March 2011 in Japan. A previous study determined his 131I thyroid content using an NaI(Tl) spectrometer. The one remaining issue was to investigate the measurement error due to inevitable differences in the configuration (e.g. the thyroid shape and volume) between the physical phantom employed for calibration of the spectrometer and the real subject. In the present study, Monte Carlo simulations for the thyroid measurements were performed using the Monte Carlo N-Particle (MNCP) code to investigate discrepancies in peak efficiencies of the spectrometer between the personalised voxel phantom created from O.K.'s magnetic resonance images and the several typical/reference phantoms that exist. As a result, the peak efficiencies for the Oak Ridge Institute of Nuclear Studies (ORINS) phantom were found to be comparable to those for the reference voxel phantoms reproducing realistic human anatomy (the Adult Male phantom and the Japanese Male phantom). The peak efficiency for the personalised phantom, on the other hand, was fairly close to that of the other physical phantom (the Transfer phantom) actually used for the calibration of the spectrometer, suggesting that the 131I thyroid content determined for him in the previous study was sufficiently accurate. The discrepancies of peak efficiencies at the primal photon energy of 131I (365 keV) among the different phantoms were improved by extending the distance between the neck and the spectrometer; however, the appropriate measurement geometry in an actual situation will depend on the primary purpose of the measurements and should be determined accordingly.
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Affiliation(s)
- Kotaro Tani
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Naoaki Kunishima
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
- Department of Radiology, Self-Defense Forces Central Hospital, 1-2-24 Ikejiri, Setagaya-ku, Tokyo, Japan
| | - Yu Igarashi
- Department of Environment Systems, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-City, Chiba, Japan
| | - Eunjoo Kim
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Takeshi Iimoto
- Department of Environment Systems, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-City, Chiba, Japan
| | - Osamu Kurihara
- Department of Radiation Measurement and Dose Assessment, National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
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Tsujiguchi T, Shiroma Y, Suzuki T, Tamakuma Y, Yamaguchi M, Iwaoka K, Hosoda M, Tokonami S, Kashiwakura I. INVESTIGATION OF EXTERNAL RADIATION DOSES DURING RESIDENTS' TEMPORAL STAY TO NAMIE TOWN, FUKUSHIMA PREFECTURE. RADIATION PROTECTION DOSIMETRY 2019; 184:514-517. [PMID: 31323670 DOI: 10.1093/rpd/ncz107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 04/04/2019] [Indexed: 06/10/2023]
Abstract
Namie Town in Fukushima Prefecture, the majority of which was an evacuation area as a result of the effects of the Fukushima Daiichi Nuclear Power Plant accident, carried out a 'temporal stay' in September 2016 so that residents could check their houses. Therefore, in cooperation with the town authorities, the authors distributed personal dosemeters and behaviour record forms to record the personal dose equivalent rate and investigate the relationship between residents' external radiation dose and their behaviour. When the personal dose equivalent rate was calculated from the measured personal dose equivalent per hour, the median was 0.12 μSv h-1, the maximum value and the minimum value were 0.58 and 0.06 μSv h-1, respectively. Meanwhile, since personal fluctuations were observed in personal dose equivalent, grasping the relationship between residents' behaviour and exposed dose can be applied to risk communication.
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Affiliation(s)
- T Tsujiguchi
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - Y Shiroma
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - T Suzuki
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - Y Tamakuma
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - M Yamaguchi
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - K Iwaoka
- Hirosaki University Institute of Radiation Emergency Medicine, Hirosaki, Japan
- National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan
| | - M Hosoda
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
| | - S Tokonami
- Hirosaki University Institute of Radiation Emergency Medicine, Hirosaki, Japan
| | - I Kashiwakura
- Hirosaki University Graduate School of Health Sciences, Hirosaki, Japan
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23
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Yamamoto H, Hayashi K, Scherb H. Association between the detection rate of thyroid cancer and the external radiation dose-rate after the nuclear power plant accidents in Fukushima, Japan. Medicine (Baltimore) 2019; 98:e17165. [PMID: 31517868 PMCID: PMC6750239 DOI: 10.1097/md.0000000000017165] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
A thyroid cancer ultrasonography screening for all residents 18 years old or younger living in the Fukushima prefecture started in October 2011 to investigate the possible effect of the radiological contamination after the Fukushima Daiichi Nuclear Power Plant accidents as of March 12 to 15, 2011. Thyroid cancer in 184 cases was reported by February 2017. The question arises to which extent those cancer cases are a biological consequence of the radiation exposure or an artefactual result of the intense screening of a large population.Experiences with the Chernobyl accident suggest that the external dose may be considered a valid surrogate for the internal dose of the thyroid gland. We, therefore, calculated the average external effective dose-rate (μSv/h) for the 59 municipalities of the Fukushima prefecture based on published data of air and soil radiation. We further determined the municipality-specific absolute numbers of thyroid cancers found by each of the two screening rounds in the corresponding municipality-specific exposed person-time observed. A possible association between the radiation exposure and the thyroid cancer detection rate was analyzed with Poisson regression assuming Poisson distributed thyroid cancer cases in the exposed person-time observed per municipality.The target populations consisted of 367,674 and 381,286 children and adolescents for the 1st and the 2nd screening rounds, respectively. In the 1st screening, 300,476 persons participated and 270,489 in the 2nd round. From October 2011 to March 2016, a total of 184 cancer cases were found in 1,079,786 person-years counted from the onset of the exposure to the corresponding examination periods in the municipalities. A significant association between the external effective dose-rate and the thyroid cancer detection rate exists: detection rate ratio (DRR) per μSv/h 1.065 (1.013, 1.119). Restricting the analysis to the 53 municipalities that received less than 2 μSv/h, and which represent 176 of the total 184 cancer cases, the association appears to be considerably stronger: DRR per μSv/h 1.555 (1.096, 2.206).The average radiation dose-rates in the 59 municipalities of the Fukushima prefecture in June 2011 and the corresponding thyroid cancer detection rates in the period October 2011 to March 2016 show statistically significant relationships.
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Affiliation(s)
- Hidehiko Yamamoto
- Osaka Red Cross Hospital Attached Facility of Physically Handicapped Children, 5-30 Fudegasaki-cho, Tennouji-ku
| | - Keiji Hayashi
- Hayashi Children's Clinic, 4-6-11-1F Nagata, Joto-ku, Osaka-Shi Osaka, Japan
| | - Hagen Scherb
- Helmholtz Zentrum München, German Research Center for Environmental Health, Institute of Computational Biology, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
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24
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Abstract
The earthquake and tsunami on 11 March 2011 led to a meltdown followed by a hydrogen explosion at the Fukushima–Daiichi nuclear power plant in Japan, causing the dispersal of abundant radionuclides into the atmosphere and ocean. The radionuclides were deposited onto trees and local residences in aerosol or gaseous forms that were partly absorbed by rain or melting snow. Here, we show that the radionuclides attached to the surfaces of trees, in which some radiocesium was incorporated into the xylem through ray cells and through symplastic pathways. The level of incorporated radiocesium varied based on tree species and age because of the ability of radiocesium to attach to the surface of the outer bark. After four years, the radiocesium level in the forest has been decreasing as it is washed out with rainwater into the sea and as it decays over time due to its half-life, but it can also be continuously recycled through leaf tissue, litter, mulch, and soil. As a result, the level of radiocesium was relatively increased in the heartwood and roots of trees at four years after the event. In private forest fields, most trees were left as afforested trees without being used for timber, although some trees were cut down. We discuss an interdisciplinary field study on the immediate effects of high radiation levels upon afforested trees in private forest fields.
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25
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Ohba T. [Lessons Learned from the Nuclear Disaster of the Great East Japan Earthquake]. Nihon Hoshasen Gijutsu Gakkai Zasshi 2019; 75:661-668. [PMID: 31327777 DOI: 10.6009/jjrt.2019_jsrt_75.7.661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Takashi Ohba
- Department of Radiation Health Management, School of Medicine, Fukushima Medical University
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26
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Ohba T, Hasegawa A, Suzuki G. Estimated Thyroid Inhalation Doses Based on Body Surface Contamination Levels of Evacuees After the Fukushima Daiichi Nuclear Power Plant Accident. HEALTH PHYSICS 2019; 117:1-12. [PMID: 31124832 DOI: 10.1097/hp.0000000000000990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Doses of inhaled radionuclides received during evacuation might be correlated with amounts of those radionuclides on an evacuee's body surface. The purpose of the present study was to estimate thyroid equivalent doses based on body surface contamination measured with a Geiger-Mueller survey meter on 2,087 evacuees from Tomioka, Okuma, Futaba, Naraha, Namie, Minamisoma, and other municipalities in Japan. The measurement value in cpm was translated into Bq cm according to the radionuclide composition obtained by germanium gamma-spectrometry analyses of two persons' clothing. Thyroid equivalent dose by inhalation was estimated by two-dimensional Monte Carlo simulation based on the distribution of body surface radionuclide concentration and a uniform distribution of deposition velocity. For evacuees exposed twice on 12 and 15 March, the mean, median, and 90th percentile of inhalation thyroid equivalent dose for 1-y-old children were 21.4 mSv, 4.7 mSv, and 40.1 mSv for the Namie group; 7.3 mSv, 5.1 mSv, and 14.8 mSv for the Minamisoma group; and 2.3 mSv, 0.5 mSv, and 4.0 mSv for the group comprising Tomioka, Okuma, Futaba, and Naraha. These estimates are smaller than estimates in the United Nations Scientific Committee on the Effects of Atomic Radiation 2013 report but closer to estimates based on direct thyroid I measurement or indirect estimates based on Cs measurements made with a whole-body counter under the assumption that the ratio of I to Cs is 3.8.
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Affiliation(s)
- Takashi Ohba
- Department of Radiation Health Management, Fukushima Medical University, Fukushima, Japan
| | - Arifumi Hasegawa
- Department of Radiation Disaster Medicine, Fukushima Medical University, Fukushima, Japan
| | - Gen Suzuki
- International University of Health and Welfare Clinic, Tochigi, Japan
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27
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Yajima K, Kim E, Tani K, Tatsuzaki H, Li C, Kurihara O. A SCREENING SURVEY EXERCISE FOR THYROID INTERNAL EXPOSURE FROM RADIOIODINE AFTER A NUCLEAR ACCIDENT. RADIATION PROTECTION DOSIMETRY 2019; 183:482-487. [PMID: 30289501 DOI: 10.1093/rpd/ncy175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 08/08/2018] [Accepted: 09/12/2018] [Indexed: 06/08/2023]
Abstract
In the aftermath of the 2011 Fukushima nuclear disaster, a screening survey for thyroid internal exposure from intake of radioiodine was performed on 1080 children using handheld NaI(Tl) survey meters. This article presents the design and results of a practical exercise conducted to develop the skills of personnel who would be potentially engaged in such a survey. Participants of this exercise were asked to measure manikin heads in which point sources were installed under normal (~0.05 μSv h-1) and elevated (~0.5 μSv h-1) background conditions. The results demonstrated that the measurements were less dependent on the background radiation level, and the deviation of net signals obtained by the participants were within 10-20% for dose rates above 0.2 μSv h-1. This result suggests that dose rates can be reliably obtained above a provisional operational intervention level for the device, 0.5 μSv h-1 under a real nuclear accident situation.
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Affiliation(s)
- Kazuaki Yajima
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Eunjoo Kim
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Kotaro Tani
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Hideo Tatsuzaki
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
| | - Chunsheng Li
- Radiation Protection Bureau, Health Canada, 775 Brookfield Rd, Ottawa, Canada
| | - Osamu Kurihara
- National Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan
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28
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Lingering health-related anxiety about radiation among Fukushima residents as correlated with media information following the accident at Fukushima Daiichi Nuclear Power Plant. PLoS One 2019; 14:e0217285. [PMID: 31150483 PMCID: PMC6544244 DOI: 10.1371/journal.pone.0217285] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 05/09/2019] [Indexed: 11/19/2022] Open
Abstract
Following the March 2011 accident at Fukushima Daiichi Nuclear Power Plant, many residents of Fukushima have faced anxieties about the health impacts of radiation exposure. Considering that source of information may influence resident anxiety, this study aimed to elucidate the correlation between the two. In addition, a health literacy query was included to examine a possible relationship between anxiety and health literacy skills. A mail survey was conducted in August 2016 among 2000 residents of Fukushima Prefecture aged 20 to 79 years. Survey items included questions about current health anxieties caused by radiation, trusted sources of information about radiation, and media used to obtain information on radiation. The survey valid response rate was 43.4%. Results of multiple linear regression analysis revealed that anxiety was significantly higher for the groups indicating “trust in citizen groups” and “use of internet sites.” Anxiety was significantly lower for the groups indicating “trust in government ministries,” “trust in local government,” and “use of local broadcast television.” Also anxiety was significantly lower for groups with higher health literacy. It was found that the significant relationship to anxiety varies depending on the sources of trust and media used. There is a possibility that this was caused by the difference between the contents of each information and media reports. In preparation for any future nuclear accident, government may consider action to improve the media literacy of residents. In addition, improving health literacy of both the recipient and the sender of information can improve access to information and thereby safeguard the health and well-being of the public.
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29
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Hosoda M, Iwaoka K, Tokonami S, Tamakuma Y, Shiroma Y, Fukuhara T, Imajyo Y, Taniguchi J, Akata N, Osanai M, Tsujiguchi T, Yamaguchi M, Kashiwakura I. Comparative Study of Performance using Five Different Gamma-ray Spectrometers for Thyroid Monitoring under Nuclear Emergency Situations. HEALTH PHYSICS 2019; 116:81-87. [PMID: 30489369 DOI: 10.1097/hp.0000000000000954] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A performance test was carried out using five different gamma-ray spectrometers applicable to thyroid monitoring. The energy resolution and efficiency for 7.6-cm × 7.6-cm NaI(Tl), 5.1-cm × 5.1-cm CeBr3, 3.8-cm × 3.8-cm SrI2(Eu), and 2.5-cm × 2.5-cm SrI2(Eu) gamma-ray scintillation spectrometers and a CdTe gamma-ray semiconductor spectrometer were evaluated using the Oak Ridge Institute for Nuclear Studies thyroid-neck phantom with a mock I source for prompt thyroid monitoring after a nuclear emergency. The respective energy resolutions of the full-energy peak for ~0.360 MeV of 3.8-cm × 3.8-cm SrI2(Eu) and 2.5-cm × 2.5-cm SrI2(Eu) scintillation spectrometers were 4.2% and 4.3%, and these values were very close to the value obtained by the CdTe semiconductor spectrometer. The efficiencies of four of the gamma-ray spectrometers were compared based on the efficiency of the 7.6-cm × 7.6-cm NaI(Tl) scintillation spectrometer at 0 cm from the phantom surface, and these values were ~70% for 5.1-cm × 5.1-cm CeBr3, ~30% for 3.8-cm × 3.8-cm SrI2(Eu), 10% for 2.5-cm × 2.5-cm SrI2(Eu) and 2% for 1-cm × 0.1-cm CdTe. Furthermore, the detection limits at various dose rates for the four gamma-ray scintillation spectrometers were evaluated using the method based on International Organization for Standardization publication ISO 11929:2010.
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Affiliation(s)
- Masahiro Hosoda
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
- Hirosaki University, Institute of Radiation Emergency Medicine, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Kazuki Iwaoka
- Hirosaki University, Institute of Radiation Emergency Medicine, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Shinji Tokonami
- Hirosaki University, Institute of Radiation Emergency Medicine, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Yuki Tamakuma
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Yoshitaka Shiroma
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Takahiro Fukuhara
- Advanced Fusion Technology, Co., Ltd., 5-6-3 Sotokanda, Chiyoda-ku, Tokyo 101-0021, Japan
| | - Yusuke Imajyo
- Advanced Fusion Technology, Co., Ltd., 5-6-3 Sotokanda, Chiyoda-ku, Tokyo 101-0021, Japan
| | - Jun Taniguchi
- EMF Japan Co., Ltd., 1-1-4 Nankadai, Kawachinagano-shi, Osaka 586-0077, Japan
| | - Naofumi Akata
- National Institute for Fusion Science/The Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi-cho, Toki-shi, Gifu 509-5292, Japan
| | - Minoru Osanai
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Takakiyo Tsujiguchi
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Masaru Yamaguchi
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
| | - Ikuo Kashiwakura
- Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
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30
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Nakaya T, Takahashi K, Takahashi H, Yasumura S, Ohira T, Ohto H, Ohtsuru A, Midorikawa S, Suzuki S, Shimura H, Yamashita S, Tanigawa K, Kamiya K. Spatial analysis of the geographical distribution of thyroid cancer cases from the first-round thyroid ultrasound examination in Fukushima Prefecture. Sci Rep 2018; 8:17661. [PMID: 30518765 PMCID: PMC6281575 DOI: 10.1038/s41598-018-35971-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 11/13/2018] [Indexed: 01/22/2023] Open
Abstract
Following the Fukushima Daiichi Nuclear Power Plant (FNPP) accident on 11 March 2011, there have been concerns regarding the health impacts of the ensuing radioactive environmental contamination, which was spatially heterogeneous. This study aimed to assess the geographical variability of thyroid cancer prevalence among children and adolescents in Fukushima Prefecture. We computed the sex- and age-standardised prevalence ratio using 115 diagnosed or suspected thyroid cancer cases among approximately 300,000 examinees at the first-round ultrasound examination during 2011–2015 from 59 municipalities in the prefecture, under the Fukushima Health Management Survey. We applied flexibly shaped spatial scan statistics and the maximised excess events test on the dataset to detect locally anomalous high-prevalence regions. We also conducted Poisson regression with selected regional indicators. Furthermore, approximately 200 examinees showed positive ultrasound examination results but did not undergo confirmatory testing; thus, we employed simulation-based sensitivity tests to evaluate the possible effect of such undiagnosed cases in the statistical analysis. In conclusion, this study found no significant spatial anomalies/clusters or geographic trends of thyroid cancer prevalence among the ultrasound examinees, indicating that the thyroid cancer cases detected are unlikely to be attributable to regional factors, including radiation exposure resulting from the FNPP accident.
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Affiliation(s)
- Tomoki Nakaya
- Graduate School of Environmental Studies, Tohoku University, Aoba-ku, Sendai-city, Miyagi, 980-0845, Japan.
| | - Kunihiko Takahashi
- Department of Biostatistics, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya-city, Aichi, 466-8550, Japan
| | - Hideto Takahashi
- National Institute of Public Health, Wako-city, Saitama, 351-0197, Japan
| | - Seiji Yasumura
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Public Health, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Tetsuya Ohira
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Epidemiology, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Hitoshi Ohto
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Akira Ohtsuru
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Radiation Health Management, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Sanae Midorikawa
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Radiation Health Management, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Shinichi Suzuki
- Department of Thyroid and Endocrinology, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Hiroki Shimura
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Laboratory Medicine, School of Medicine, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Shunichi Yamashita
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Department of Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki-city, Nagasaki, 852-8523, Japan
| | - Koichi Tanigawa
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan
| | - Kenji Kamiya
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, Fukushima-city, Fukushima, 960-1295, Japan.,Research Institute for Radiation Biology and Medicine, Hiroshima University, Minami-ku, Hiroshima-city, Hiroshima, 734-5844, Japan
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31
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Tokonami S, Hosoda M. Thyroid equivalent doses for evacuees and radiological impact from the Fukushima nuclear accident. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.09.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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32
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Ishikawa T, Matsumoto M, Sato T, Yamaguchi I, Kai M. Internal doses from radionuclides and their health effects following the Fukushima accident. JOURNAL OF RADIOLOGICAL PROTECTION : OFFICIAL JOURNAL OF THE SOCIETY FOR RADIOLOGICAL PROTECTION 2018; 38:1253-1268. [PMID: 30124199 DOI: 10.1088/1361-6498/aadb4c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This paper presents an overview of current internal dose estimates from the Fukushima accident, potential population specific uncertainties in these estimates are investigated, along with the relative effects of internal and external exposures. Thyroid doses were largely due to 131I, but variations in thyroid weight and fractional uptake and retention times of 131I in the thyroid contribute to uncertainties in thyroid dose estimates. Lower values for these parameters in the Japanese population, as compared to international reference assumptions, would lead to underestimation of doses on the basis of reference thyroid weights and overestimation of doses using reference thyroid uptake and retention times. Any overall bias in thyroidal doses due to population specific factors is the net result of the balance between these effects. Internal doses to other organs are largely due to 134Cs and 137Cs and their whole body distribution, population specific differences in these dose estimates are driven by average body mass, due to the inverse relationship between this and retention times. Potential differences in dose estimates and any inferred risks, due to local population specific factors, may be less than a factor of two for children and male adults, but the potential difference may be slightly underestimated for female adults. Recent micro-dosimetric studies have confirmed the existing perception that risk from internal exposures to 137Cs, 134Cs, and 131I should be nearly equivalent to that from external exposure to gamma rays at the same absorbed dose. Epidemiological studies provide comparisons between external and internal exposures to 131I in children and suggest that effects of internal exposure are similar to those of external exposure. Effective dose has been formulated to harmonise internal and external exposure risks for radiation protection purposes. On the basis of this review, the use of effective dose in this context does not seem to be unreasonable.
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Affiliation(s)
- Tetsuo Ishikawa
- Ad hoc Committee of Internal Exposure Evaluation of Japan Health Physics Society, Yoshimatsu Buid. 3F, 3-7-2 Shinbashi, Minato-ku, Tokyo, 105-0004, Japan. Fukushima Medical University, Hikarigaoka 1, Fukushima City, 960-1295, Japan
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33
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Kurihara O, Li C, Lopez MA, Kim E, Tani K, Nakano T, Takada C, Momose T, Akashi M. Experiences of Population Monitoring Using Whole-Body Counters in Response to the Fukushima Nuclear Accident. HEALTH PHYSICS 2018; 115:259-274. [PMID: 29957688 DOI: 10.1097/hp.0000000000000862] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Whole-body counter measurements of residents of Fukushima Prefecture have been extensively performed after the Fukushima Dai-ichi Nuclear Power Plant accident in March 2011. These measurements have demonstrated that the levels of internal contamination with radioactive cesium (Cs and Cs) in the residents are very low. This article provides an overview of and lessons learned from these whole-body counter measurements with emphasis on the technical problems encountered, and it discusses the effective use of whole-body counters for assessing the internal thyroid doses of individuals when direct measurements of I in the thyroid are difficult or impossible to implement for the total affected population in a short time after a nuclear reactor accident. The application of this dose reconstruction method requires determining the intake ratio of I to cesium isotopes at appropriate times and considers the short biological half-lives of cesium isotopes, in particular for children.
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Affiliation(s)
- Osamu Kurihara
- National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
| | - Chunsheng Li
- Radiation Protection Bureau, Health Canada, 775 Brookfield Rd., Ottawa, Canada
| | - Maria Antonia Lopez
- Centro de Investigaciones Emergéticas, Medioambientales y Technológicas, Avda. Complutense 40, 28040 Madrid, Spain
| | - Eunjoo Kim
- National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
| | - Kotaro Tani
- National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
| | - Takashi Nakano
- National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
| | - Chie Takada
- Japan Atomic Energy Agency, Nuclear Fuel Cycle Development Laboratories, 4-33 Muramatsu, Tokai-mura, Ibaraki, Japan
| | - Takumaro Momose
- Japan Atomic Energy Agency, Nuclear Fuel Cycle Development Laboratories, 4-33 Muramatsu, Tokai-mura, Ibaraki, Japan
| | - Makoto Akashi
- National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba, Japan
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The Authors Respond. Epidemiology 2018; 29:e57-e58. [PMID: 30052545 DOI: 10.1097/ede.0000000000000897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sihver L, Yasuda N. Causes and Radiological Consequences of the Chernobyl and Fukushima Nuclear Accidents. JOURNAL OF NUCLEAR ENGINEERING AND RADIATION SCIENCE 2018. [DOI: 10.1115/1.4037116] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this paper, the causes and the radiological consequences of the explosion of the Chernobyl reactor occurred at 1:23 a.m. (local time) on Apr. 26, 1986, and of the Fukushima Daiichi nuclear disaster following the huge Tsunami caused by the Great East Japan earthquake at 2.46 p.m. (local time) on Mar. 11, 2011 are discussed. The need for better severe accident management (SAM), and severe accident management guidelines (SAMGs), are essential in order to increase the safety of the existing and future operating nuclear power plants (NPPs). In addition to that, stress tests should, on a regular basis, be performed to assess whether the NPPs can withstand the effects of natural disasters and man-made failures and actions. The differences in safety preparations at the Chernobyl and Fukushima Daiichi will therefore be presented, as well as recommendations concerning improvements of safety culture, decontamination, and disaster planning. The need for a high-level national emergency response system in case of nuclear accidents will be discussed. The emergency response system should include fast alarms, communication between nuclear power plants, nuclear power authorities and the public people, as well as well-prepared and well-established evacuation plans and evacuation zones. The experiences of disaster planning and the development of a new improved emergency response system in Japan will also be presented together with the training and education program, which have been established to ensure that professional rescue workers, including medical staff, fire fighters, and police, as well as the normal populations including patients, have sufficient knowledge about ionizing radiation and are informed about the meaning of radiation risks and safety.
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Affiliation(s)
- L. Sihver
- Technische Universität Wien, Atominstitut, Stadionallee 2, Vienna 1020, Austria e-mail:
| | - N. Yasuda
- Research Institute of Nuclear Engineering, University of Fukui, Tsuruga-shi, Fukui 914-0055, Japan
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Weller A, Hori M, Shozugawa K, Steinhauser G. Rapid ultra-trace determination of Fukushima-derived radionuclides in food. Food Control 2018. [DOI: 10.1016/j.foodcont.2017.10.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Prand-Stritzko B, Steinhauser G. Characteristics of radiocesium contaminations in mushrooms after the Fukushima nuclear accident: evaluation of the food monitoring data from March 2011 to March 2016. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:2409-2416. [PMID: 29124643 DOI: 10.1007/s11356-017-0538-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2017] [Accepted: 10/19/2017] [Indexed: 04/16/2023]
Abstract
The monitoring inspection of food after the Fukushima nuclear accident (2011) was essential for ensuring food safety in Japan and reducing the adverse health effects due to incorporation of inacceptable amounts of radionuclides, in particular radiocesium (134Cs and 137Cs). In this study, the mushroom fraction of the governmental data set of the first 5 years after the accident has been analyzed for contamination levels in mushrooms, in particular time trends and radioecological characteristics as well as associated health risks. The analyses show that mycorrhiza mushrooms are much more sensitive for radionuclide uptake than saprobiontic mushrooms (the latter of which include the very popular shiitake mushrooms (Lentinula edodes)). The maximum value reached 31,000 Bq/kg in a sample of apricot milkcaps in 2012. Analysis of the origin of the samples revealed that the origin (in terms of prefecture) of the mushrooms was a less determining factor for the contamination level than the type of mushrooms, as most exceedances in 2012 and thereafter were found outside Fukushima Prefecture. Several dose models were applied to the data to evaluate both worst case and realistic effective committed dose scenarios. The doses were generally rather low due to low consumption rates in the Japanese food basket. In any case, the analysis proved that the food monitoring campaign was highly effective in cutting doses to the public by more than a factor of 10 compared with a hypothetical scenario in which no monitoring had been conducted.
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Affiliation(s)
- Benedikt Prand-Stritzko
- Institute of Radioecology and Radiation Protection, Leibniz Universität Hannover, 30419, Hannover, Germany
- Höhere technische Bundeslehranstalt Karlstein, 3822, Karlstein an der Thaya, Austria
| | - Georg Steinhauser
- Institute of Radioecology and Radiation Protection, Leibniz Universität Hannover, 30419, Hannover, Germany.
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Genc R, Alas MO, Harputlu E, Repp S, Kremer N, Castellano M, Colak SG, Ocakoglu K, Erdem E. High-Capacitance Hybrid Supercapacitor Based on Multi-Colored Fluorescent Carbon-Dots. Sci Rep 2017; 7:11222. [PMID: 28894243 PMCID: PMC5593850 DOI: 10.1038/s41598-017-11347-1] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 08/23/2017] [Indexed: 12/23/2022] Open
Abstract
Multi-colored, water soluble fluorescent carbon nanodots (C-Dots) with quantum yield changing from 4.6 to 18.3% were synthesized in multi-gram using dated cola beverage through a simple thermal synthesis method and implemented as conductive and ion donating supercapacitor component. Various properties of C-Dots, including size, crystal structure, morphology and surface properties along with their Raman and electron paramagnetic resonance spectra were analyzed and compared by means of their fluorescence and electronic properties. α-Manganese Oxide-Polypyrrole (PPy) nanorods decorated with C-Dots were further conducted as anode materials in a supercapacitor. Reduced graphene oxide was used as cathode along with the dicationic bis-imidazolium based ionic liquid in order to enhance the charge transfer and wetting capacity of electrode surfaces. For this purpose, we used octyl-bis(3-methylimidazolium)diiodide (C8H16BImI) synthesized by N-alkylation reaction as liquid ionic membrane electrolyte. Paramagnetic resonance and impedance spectroscopy have been undertaken in order to understand the origin of the performance of hybrid capacitor in more depth. In particular, we obtained high capacitance value (C = 17.3 μF/cm2) which is exceptionally related not only the quality of synthesis but also the choice of electrode and electrolyte materials. Moreover, each component used in the construction of the hybrid supercapacitor is also played a key role to achieve high capacitance value.
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Affiliation(s)
- Rukan Genc
- Department of Chemical Engineering, Engineering Faculty of Mersin University, Mersin University, TR-33343, Mersin, Turkey.
- Advanced Technology, Research, and Application Center, Mersin University, TR-33343, Mersin, Turkey.
| | - Melis Ozge Alas
- Department of Chemical Engineering, Engineering Faculty of Mersin University, Mersin University, TR-33343, Mersin, Turkey
| | - Ersan Harputlu
- Advanced Technology, Research, and Application Center, Mersin University, TR-33343, Mersin, Turkey
| | - Sergej Repp
- Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg, Germany
| | - Nora Kremer
- Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg, Germany
| | - Mike Castellano
- Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg, Germany
| | - Suleyman Gokhan Colak
- Advanced Technology, Research, and Application Center, Mersin University, TR-33343, Mersin, Turkey
| | - Kasim Ocakoglu
- Advanced Technology, Research, and Application Center, Mersin University, TR-33343, Mersin, Turkey.
- Department of Energy Systems Engineering, Faculty of Technology, Mersin University, TR-33480, Tarsus, Mersin, Turkey.
| | - Emre Erdem
- Institut für Physikalische Chemie, Albert-Ludwigs-Universität Freiburg, Albertstr. 21, 79104, Freiburg, Germany.
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Steinhauser G, Chávez-Ortega M, Vahlbruch JW. Japanese Food Data Challenge the Claimed Link between Fukushima's Releases and Recently Observed Thyroid Cancer Increase in Japan. Sci Rep 2017; 7:10722. [PMID: 28878354 PMCID: PMC5587547 DOI: 10.1038/s41598-017-10584-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 08/09/2017] [Indexed: 12/20/2022] Open
Abstract
Internal, high-dose exposure with radioiodine is known to increase the risk for thyroid cancer in children and adolescents. Ingestion of contaminated food is generally regarded a dominant route of internal exposure. We analyzed the huge data set of the post-Fukushima food monitoring campaign and deployed a conservative model for the estimation of the doses to the general public in a worst-case scenario. Our data suggest that the committed equivalent ingestion doses to the thyroids of the affected Japanese public, even in the utmost conservative approach, remained below the limit on ingestion of radioiodine in foodstuffs and beverages of 50 mSv (as thyroid equivalent dose). This level of 50 mSv is also the intervention level for the administration of stable iodine, mainly after inhalation. Our study hence suggests that, based on the food data, the internal exposure of Japanese residents was too low to cause a statistically discernible increase in thyroid cancer, even if the contribution from inhalation is taken into account. The data also indicate that the governmental efforts in the food monitoring campaign were successful and cut the thyroid doses to the public by a factor of approximately 3 compared to a scenario without any monitoring.
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Affiliation(s)
- Georg Steinhauser
- Leibniz Universität Hannover, Institute of Radioecology and Radiation Protection, Herrenhäuser Str. 2, 30419, Hannover, Germany.
| | - Manuel Chávez-Ortega
- Leibniz Universität Hannover, Institute of Radioecology and Radiation Protection, Herrenhäuser Str. 2, 30419, Hannover, Germany
| | - Jan-Willem Vahlbruch
- Leibniz Universität Hannover, Institute of Radioecology and Radiation Protection, Herrenhäuser Str. 2, 30419, Hannover, Germany
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Ohba T, Hasegawa A, Kohayagawa Y, Kondo H, Suzuki G. Body Surface Contamination Levels of Residents under Different Evacuation Scenarios after the Fukushima Daiichi Nuclear Power Plant Accident. HEALTH PHYSICS 2017; 113:175-182. [PMID: 28749808 DOI: 10.1097/hp.0000000000000690] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Body surface contamination levels should be correlated with inhaled actual thyroid doses during evacuation following the Fukushima Daiichi nuclear power plant (FDNPP) accident. Evacuees and residents were screened for body surface contamination using a Geiger-Mueller survey meter. The authors obtained 7,539 individual screening data sheets as well as gamma-spectrometry data from measurements made on clothing of two subjects by using a germanium spectrometer. Body surface contamination levels were analyzed in four residential groups during two different periods: 12-14 and 15-17 March 2011. Contamination levels during 12-14 March in the Tomioka/Okuma/Futaba/Naraha group were very low, indicating that residents evacuated before the radioactive plume reached their towns on 12 March. In contrast, levels in the Namie and Minamisoma groups were higher than those in the other groups in both periods, indicating that these residents were exposed to plumes twice on 12 and 15-16 March. The plume on 12 March was enriched with short-lived radionuclides: averaged proportions of radioactivity (relative to I) from Te, I, and Cs measured in clothing from two subjects were 2.3, 1.1, and 0.1, respectively, after correction for physical decay by 12:00 on 12 March. These proportions are similar to those (relative to I) from Te and Cs in dust sampled by a high-volume air sampler in the zone 20 km from the FDNPP on 12 March: 1.9 and 0.1, respectively. These data indicate that the relative contribution to inhaled thyroid dose of short-lived radionuclides in radioactive plumes released on 12 March could be as much as 37.5% in 1-y-old children.
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Affiliation(s)
- Takashi Ohba
- *Department of Radiation Health Management, Fukushima Medical University, Fukushima, Japan; †ISGlobal (Institut de Salut Global de Barcelona), Barcelona, Spain; ‡Department of Radiation Disaster Mediceine, Fukushima Medical University, Fukushima, Japan; §National Hospital Organization Disaster Medical Center, Tokyo, Japan; **International University of Health and Welfare Clinic, Tochigi, Japan
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Takahashi K. Subclinical Hypothyroidism, Pregnancy and the Fukushima Nuclear Power Plant Accident. TOHOKU J EXP MED 2017; 242:165-166. [PMID: 28690280 DOI: 10.1620/tjem.242.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Kazuhiro Takahashi
- Executive Editor, Tohoku Journal of Experimental Medicine.,Department of Endocrinology and Applied Medical Science, Tohoku University Graduate School of Medicine
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Kunishima N, Kurihara O, Kim E, Ishikawa T, Nakano T, Fukutsu K, Tani K, Furuyama K, Hashimoto S, Hachiya M, Naoi Y, Akashi M. Early Intake of Radiocesium by Residents Living Near the Tepco Fukushima Dai-ichi Nuclear Power Plant After the Accident. Part 2: Relationship Between Internal Dose and Evacuation Behavior in Individuals. HEALTH PHYSICS 2017; 112:512-525. [PMID: 28441283 DOI: 10.1097/hp.0000000000000657] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The Tokyo Electric Power Company's Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident exposed members of the public to radiation. This study analyses the relation between personal behavior data obtained from 112 out of 174 subjects who underwent whole-body measurements by the National Institute of Radiological Sciences (NIRS) during the period from 27 June to 28 July 2011 and their committed effective doses (CEDs) from Cs and Cs. The whereabouts of the 112 persons living in municipalities near the FDNPP (mainly, Namie town) on several days in March 2011 are graphed on maps. It was confirmed that most subjects started evacuation promptly and had left the 20-km-radius of the FDNPP by the end of 12 March. The individual CEDs were poorly correlated with the person's distances from the FDNPP at any day in March. Meanwhile, the percentage of persons remaining within the 20-km radius of the FDNPP was 100% at 16:00 on 12 March and 42.9% at 0:00 on 15 March for those with CEDs > 0.1 mSv, whereas the corresponding values were much lower for those with CEDs ≤ 0.1 mSv. This suggests that the time of evacuation would be one of the crucial factors for the early intake; however, more personal behavior data are needed to be analyzed to clarify the relevance to the individual internal dose.
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Affiliation(s)
- Naoaki Kunishima
- *National Institutes for Quantum and Radiological Sciences and Technology, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba-city, Chiba, Japan; †Self-Defense Forces Central Hospital, 1-2-24 Ikejiri, Setagaya-ku, Tokyo, Japan; ‡Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo, Japan; §Fukushima Medical University, 1-Hikarigaoka, Fukushima-city, Fukushima, Japan; **Nuclear Safety Technology Center, 5-1-3-101 Hakusan, Bunkyo-ku, Tokyo, Japan
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Beaumont T, Ideias PC, Rimlinger M, Broggio D, Franck D. Development and test of sets of 3D printed age-specific thyroid phantoms for131I measurements. Phys Med Biol 2017; 62:4673-4693. [DOI: 10.1088/1361-6560/aa6514] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hosokawa Y, Nomura K, Tsushima E, Kudo K, Noto Y, Nishizawa Y. Whole-Body Counter(WBC) and food radiocesium contamination surveys in Namie, Fukushima Prefecture. PLoS One 2017; 12:e0174549. [PMID: 28334042 PMCID: PMC5363944 DOI: 10.1371/journal.pone.0174549] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 03/11/2017] [Indexed: 11/25/2022] Open
Abstract
Purpose This study examined the internal Cs exposure of residents and the Cs present in food products produced in Namie. Whole-body counter (WBC) was used for the measurement of internal exposure per each whole body of examinees. Methods The food products which appeared to be used for consumption, were brought by residents and commercially available food items were excluded. Most of them were wild plants or food items produced by residents. Four years of data from April 2012 to March 2013 (fiscal 2012) and April 2015 to March 2016 (Fiscal 2015) were analyzed and studied. Results The average radioactivity measured by WBC was approximately 5 Bq for Cs-134, and 20 Bq for Cs-137 and the average committed effective dose was approximately 1 μSv. The average for the residents with detectable radioactivity was 25 μSv, and the human health effects are considered to be extremely low risk. However, the radioactivity of the affected individuals showed a higher value than the theoretical attenuation rate. The majority (83.2%) of individuals exhibiting radioactivity were over 50 years old. The number of food products brought in for detection decreased as the study period progressed, but the number of food products with radioactivity had increased. While the items with a higher detection rate of radioactivity included fruits such as citron and persimmon, shiitake mushrooms exhibited the highest radioactivity. Moreover, the radioactivity of seven items in these 10 items decreased from fiscal 2012 to fiscal 2015. Mushrooms had high radioactivity and were produced over a wide area. Conclusion We suggest that the elderly try to enjoy life and eat wild plants in moderation while inspecting food products. Therefore, we will continue to work in raising awareness of radiation and its potential presence in food products and thus the continuing necessity of monitoring radioactivity in food in the future.
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Affiliation(s)
- Yoichiro Hosokawa
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
- * E-mail:
| | - Kazuki Nomura
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - Eiki Tsushima
- Department of Comprehensive Rehabilitation Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - Kohsei Kudo
- Department of Radiation Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - Yuka Noto
- Department of Nursing Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
| | - Yoshiko Nishizawa
- Department of Nursing Science, Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan
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Murakami M, Sato A, Matsui S, Goto A, Kumagai A, Tsubokura M, Orita M, Takamura N, Kuroda Y, Ochi S. Communicating With Residents About Risks Following the Fukushima Nuclear Accident. Asia Pac J Public Health 2017; 29:74S-89S. [DOI: 10.1177/1010539516681841] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Fukushima nuclear accident in March 2011 posed major threats to public health. In response, medical professionals have tried to communicate the risks to residents. To investigate forms of risk communication and to share lessons learned, we reviewed medical professionals’ activities in Fukushima Prefecture from the prefectural level to the individual level: public communication through Fukushima Health Management Surveys, a Yorozu (“general”) health consultation project, communications of radiological conditions and health promotion in Iitate and Kawauchi villages, dialogues based on whole-body counter, and science communications through online media. The activities generally started with radiation risks, mainly through group-based discussions, but gradually shifted to face-to-face communications to address comprehensive health risks to individuals and well-being. The activities were intended to support residents’ decisions and to promote public health in a participatory manner. This article highlights the need for a systematic evaluation of ongoing risk communication practices, and a wider application of successful approaches for Fukushima recovery and for better preparedness for future disasters.
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Affiliation(s)
| | - Akiko Sato
- United Nations University Institute for the Advanced Study of Sustainability, Tokyo, Japan
| | | | - Aya Goto
- Fukushima Medical University, Fukushima, Japan
| | | | - Masaharu Tsubokura
- Soma Central Hospital, Fukushima, Japan
- Minamisoma Municipal General Hospital, Fukushima, Japan
| | | | | | | | - Sae Ochi
- Soma Central Hospital, Fukushima, Japan
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Vuong HG, Altibi AM, Abdelhamid AH, Ngoc PUD, Quan VD, Tantawi MY, Elfil M, Le Huy Vu T, Elgebaly A, Oishi N, Nakazawa T, Hirayama K, Katoh R, Huy NT, Kondo T. The changing characteristics and molecular profiles of papillary thyroid carcinoma over time: a systematic review. Oncotarget 2017; 8:10637-10649. [PMID: 27793009 PMCID: PMC5354688 DOI: 10.18632/oncotarget.12885] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Accepted: 10/14/2016] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The genetic alterations of papillary thyroid carcinoma (PTC) have been reported to change over the past few decades. We performed this systematic review to further examine the trends and modifications of patient demographic, clinicopathological features and molecular profiles of PTC over time. METHODS A literature search was performed within six electronic databases to identify relevant articles. The inclusion criteria were published studies investigating BRAF mutations, RET/PTC rearrangements or RAS mutations in PTCs or classical PTCs. Two teams of reviewers independently screened titles and abstracts of all articles. Full texts of potential articles were read and extracted data were listed and stratified into an excel file according to country, city, institution, and surgical time period. Student t test and Pearson Chi-square were used to analyze the trends of demographic and clinicopathological features of PTC patients and the prevalence of each genetic alteration in individual institutions. RESULTS From 3139 articles, we included 16 articles for final analysis. Our results showed an increasing trend of BRAF and a decreasing trend of RET/PTC prevalence over time in PTCs and classical PTCs, accompanied by an older age of PTC patients, an increase in proportion of PTMC and less aggressive behaviours of tumours. CONCLUSIONS The demographic and clinicopathological characteristics and molecular profile of PTCs have been changing over the past few decades. These modifications suggest changes in etiologies and risk factors of thyroid cancer that influence the tumorigenesis of PTCs.
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Affiliation(s)
- Huy Gia Vuong
- Department of Pathology, University of Yamanashi, Yamanashi, Japan
- Department of Pathology, Cho Ray Hospital, Ho Chi Minh City, Vietnam
| | | | | | | | - Vo Duy Quan
- University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam
| | | | - Mohamed Elfil
- Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | | | | | - Naoki Oishi
- Department of Pathology, University of Yamanashi, Yamanashi, Japan
| | - Tadao Nakazawa
- Department of Pathology, University of Yamanashi, Yamanashi, Japan
| | - Kenji Hirayama
- Department of Immunogenetics, Institute of Tropical Medicine, Leading Graduate School Program, and Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto, Nagasaki, Japan
| | - Ryohei Katoh
- Department of Pathology, University of Yamanashi, Yamanashi, Japan
| | - Nguyen Tien Huy
- Department of Clinical Product Development, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan
| | - Tetsuo Kondo
- Department of Pathology, University of Yamanashi, Yamanashi, Japan
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Saenko VA, Thomas GA, Yamashita S. Meeting report: the 5th International expert symposium in Fukushima on radiation and health. Environ Health 2017; 16:3. [PMID: 28100245 PMCID: PMC5241991 DOI: 10.1186/s12940-017-0211-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND The symposium entitled "Chernobyl +30, Fukushima +5: Lessons and Solutions for Fukushima's Thyroid Question" was held in September, 2016 in Fukushima. The aim of the Symposium was to revisit and recapitulate evidence from the studies in Chernobyl in order to share multidisciplinary opinions and views on the likely reason for the high rate of thyroid cancer detected by the Thyroid Ultrasound Examination program in Fukushima Prefecture. PARTICIPANTS AND MATTERS DISCUSSED The high prevalence of thyroid cancer in young individuals causes concerns among Fukushima residents and the general public that it might be due to putative radiation exposure from the Fukushima Daiichi Nuclear Power Plant accident. Twenty-six experts from Japan and abroad, including participants affiliated with international organizations, reviewed the results of radiation epidemiology investigations in Chernobyl, presented clinical experience of diagnosis, treatment and follow-up of patients with radiation-related thyroid cancer, and scrutinized the findings on thyroid cancer in Fukushima. CONCLUSION Conclusions drawn at the symposium included understanding that in contrast to Chernobyl, doses to the public from the accident in Fukushima were too low to give rise to a discernible excess risk for thyroid cancer. The high detection rate of thyroid cancer and benign abnormalities resulted from the use of highly sensitive ultrasound equipment and sophisticated protocol of examination used in the Thyroid Ultrasound Examination, and therefore not attributable to radiation. Coordinated efforts will be necessary to avoid overdiagnosis and overtreatment, which may carry its own health disbenefits. Clear communication to the screening participants and their families is recommended in regard to why the examination is being conducted and to explain the likely outcomes and risks, including the means and options for treatment if a thyroid disorder is detected.
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Affiliation(s)
- Vladimir A. Saenko
- Department of Radiation Molecular Epidemiology, Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, 852-8523 Nagasaki, Japan
| | - Geraldine A. Thomas
- Imperial College London, Charing Cross Hospital, Fulham Palace Road, London, W6 8RF UK
| | - Shunichi Yamashita
- Department of Radiation Molecular Epidemiology, Atomic Bomb Disease Institute, Nagasaki University, 1-12-4 Sakamoto, 852-8523 Nagasaki, Japan
- Radiation Medical Science Center for the Fukushima Health Management Survey, Fukushima Medical University, 1 Hikarigaoka, 960-1295 Fukushima, Japan
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48
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Ohba T, Hasegawa A, Kohayakawa Y, Kondo H, Suzuki G. Estimation of thyroid equivalent doses during evacuation based on body surface contamination levels in the nuclear accident of FDNPS in 2011. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201715308009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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49
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Kurihara O, Kim E, Kunishima N, Tani K, Ishikawa T, Furuyama K, Hashimoto S, Akashi M. Development of a tool for calculating early internal doses in the Fukushima Daiichi nuclear power plant accident based on atmospheric dispersion simulation. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201715308008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Okazaki R, Ohga K, Yoko-O M, Kohzaki M. [A Survey about the Radiation Effects and A Health Survey of Fukushima Inhabitants after the Fukushima Daiichi Nuclear Power Plant Accident]. J UOEH 2017; 39:277-290. [PMID: 29249741 DOI: 10.7888/juoeh.39.277] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
According to questionnaire surveys in 2011 and 2013 about the health effects of radiation after the Fukushima Daiichi Nuclear Power Plant Accident, the guardians of child patients were more anxious than doctors and medical students. Also, according to the thyroid examinations in a Fukushima health survey, 190 cases of thyroid cancer were reported, and anxiety about radiation effects remained. This study is based on a survey about the guardians of child patients anxiety about radiation effects six years after the nuclear power plant accident, and includes a questionnaire survey about radiation effects and thyroid examinations in a Fukushima health survey. Anonymous question sheets with 20 questions were sent to pediatric medical facilities in Fukushima, and the parents of children who consulted the pediatric and medical staff answered the questionnaire. Thirty percent of the guardians of child patients had never been educated about radiation and 67% had never been educated about the effects of radiation on humans. The guardians of child patients were more anxious than the medical staff about thyroid cancer, health effects on children and genetic effects. Our results indicate that the guardians of child patients think that the increase in the incidence of thyroid cancer is due to radiation effects after the nuclear power plant accident and they desire continued thyroid examinations.
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Affiliation(s)
- Ryuji Okazaki
- Department of Radiological Health Science, University of Occupational and Environmental Health, Japan
| | | | - Makoto Yoko-O
- Department of Environmental Epidemiology, University of Occupational and Environmental Health, Japan
| | - Masaoki Kohzaki
- Department of Radiological Health Science, University of Occupational and Environmental Health, Japan
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