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Panda M, Joshi S, Annalakshmi O, C VS, Venkatraman B. Spectroscopic and dosimetric comparison of tooth enamel separation methods for EPR retrospective dosimetry. Heliyon 2024; 10:e30571. [PMID: 38742072 PMCID: PMC11089350 DOI: 10.1016/j.heliyon.2024.e30571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2024] [Accepted: 04/29/2024] [Indexed: 05/16/2024] Open
Abstract
Precise estimation of individual radiation dose utilizing biomaterials (fingernail, bone, and tooth) is very challenging due to their complex sample processing. Despite, tooth enamel, the most mineralized tissue of tooth is used for this purpose due to its high radiation sensitivity and ability to produce radiation induced long lived CO2- radicals. However, human teeth are not always available, and invasive nature of sample collection adds to the complexity making dose estimation difficult. In such cases, animal teeth (goat, cow, and moose) can be used as a substitute for human teeth due to comparable enamel sensitivity. Moreover, separation of enamel from dentine is a crucial step towards accurate dose estimation from irradiated teeth. In this work, Indian goat teeth were used as it was readily available to us and the comparison of goat enamel sensitivity to radiation was found to be within ∼7.4 % that of human. The enamel samples were separated following two chemical methods; (1) density separation using sodium polytungstate, (2) alkaline denaturation using NaOH and the quality was compared based on their purity and radiation sensitivity. Combined results of spectroscopic characterization using X-ray diffraction (XRD), Fourier transform infrared (FTIR), and Raman analysis authenticated the crystallinity and purity of the separated enamel samples. The radiation sensitivity of separated enamel samples was compared by electron paramagnetic resonance (EPR) analysis as a part of dosimetric characterization. The suitability of both the samples for retrospective dosimetry and epidemiological studies was checked by validating the dose estimated from separated enamel samples with standard alanine/EPR dosimeter.
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Affiliation(s)
- Madhusmita Panda
- Safety Quality and Research Management Group, IGCAR, Kalpakkam, 603102, India
| | - Shailesh Joshi
- Safety Quality and Research Management Group, IGCAR, Kalpakkam, 603102, India
| | - O. Annalakshmi
- Safety Quality and Research Management Group, IGCAR, Kalpakkam, 603102, India
- Homi Bhabha National Institute, IGCAR, Kalpakkam, 603102, India
| | - Venkata Srinivas C
- Safety Quality and Research Management Group, IGCAR, Kalpakkam, 603102, India
- Homi Bhabha National Institute, IGCAR, Kalpakkam, 603102, India
| | - B. Venkatraman
- Safety Quality and Research Management Group, IGCAR, Kalpakkam, 603102, India
- Homi Bhabha National Institute, IGCAR, Kalpakkam, 603102, India
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Oka T, Takahashi A, Koarai K, Kino Y, Sekine T, Shimizu Y, Chiba M, Suzuki T, Osaka K, Sasaki K, Shinoda H. Detection limit of electron spin resonance for Japanese deciduous tooth enamel and density separation method for enamel-dentine separation. JOURNAL OF RADIATION RESEARCH 2022; 63:609-614. [PMID: 35780302 PMCID: PMC9303628 DOI: 10.1093/jrr/rrac033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 08/27/2021] [Indexed: 06/15/2023]
Abstract
Electron spin resonance (ESR) dosimetry is one of the most powerful tools for radiation dose reconstruction. The detection limit of this technique using human teeth is reported to be 56 mGy or 67 mGy; however, the absorbed dose of Fukushima residents after the Fukushima Daiichi Nuclear Power Plant (FNPP) accident was estimated to be lower than this detection limit. Our aim is to assess the absorbed radiation dose of children in Fukushima Prefecture after the accident; therefore, it is important to estimate the detection limit for their teeth. The detection limit for enamel of deciduous teeth of Japanese children separated by the mechanical method is estimated to be 115.0 mGy. The density separation method can effectively separate enamel from third molars of Japanese people. As we have collected thousands of teeth from children in Fukushima, the present technique may be useful to examine their external absorbed dose after the FNPP accident.
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Affiliation(s)
- Toshitaka Oka
- Corresponding author. Research Group for Nuclear Chemistry, Chemistry, Environment and Radiation Division, Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.
| | - Atsushi Takahashi
- Tohoku University Hospital, Tohoku University, 1-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8574, Japan
| | - Kazuma Koarai
- Collaborative Laboratories for Advanced Decommissioning Science, Sector of Fukushima Research and Development, Japan Atomic Energy Agency, 790-1 Ohtsuka, Motooka, Tomioka Town, Futaba County, Fukushima 979-1151, Japan
| | - Yasushi Kino
- Institute for Excellence in Higher Education, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai City, Miyagi 980-8576, Japan
| | - Tsutomu Sekine
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-aoba, Aoba-ku, Sendai City, Miyagi 980-8578, Japan
- Institute for Excellence in Higher Education, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai City, Miyagi 980-8576, Japan
| | - Yoshinaka Shimizu
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
| | - Mirei Chiba
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
| | - Toshihiko Suzuki
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
| | - Ken Osaka
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
| | - Keiichi Sasaki
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
| | - Hisashi Shinoda
- Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai City, Miyagi 980-8575, Japan
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Toyoda S, Murahashi M, Natsuhori M, Ito S, Ivannikov A, Todaka A. RETROSPECTIVE ESR RECONSTRUCTION OF CATTLE TOOTH ENAMEL DOSES FROM THE RADIOACTIVE NUCLEI RELEASED BY THE ACCIDENT OF FUKUSHIMA DAI-ICHI ATOMIC POWER PLANTS. RADIATION PROTECTION DOSIMETRY 2019; 186:48-53. [PMID: 31120538 DOI: 10.1093/rpd/ncz037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 12/27/2018] [Indexed: 06/09/2023]
Abstract
The method of electron spin resonance (ESR) tooth enamel dosimetry was successfully applied to cattle molar teeth exposed in the accident of Fukushima Dai-ichi atomic power plants. Total of 10 samples from 5 cattle were examined and the doses were retrospectively reconstructed to be up to 1.2 Gy (enamel dose). The dose values are roughly consistent with those estimated from the monitored environmental dose rate and the durations of the exposure. This first successful result on ESR reconstruction of doses in the actual radiation accident indicates that ESR tooth enamel dosimetry with cattle is practically useful in the dose range of ~1 Gy.
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Affiliation(s)
- Shin Toyoda
- Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Kita-ku, Okayama, 700-0005, Japan
| | - Mika Murahashi
- Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Kita-ku, Okayama, 700-0005, Japan
| | - Masahiro Natsuhori
- School of Veterinary Medicine, Kitasato University, 35-1 Higashi, 23-bancho, Towada, Aomori, 034-8628, Japan
| | - Setsuro Ito
- Fazenda da Esperanza Fukushima, 157 Aza Haru-uno, Oaza Tateno, Namie-cho, Futaba-gun, Fukushima, 979-1501, Japan
| | - Alexander Ivannikov
- A. Tsyb Medical Radiological Research Center, 10 Marshal Zhukov str., Obninsk, 249031, Russia
| | - Azumi Todaka
- Department of Applied Physics, Okayama University of Science, 1-1 Ridai, Kita-ku, Okayama, 700-0005, Japan
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Harshman A, Johnson T. Dose Reconstruction Using Electron Paramagnetic Resonance Dosimetry on Tooth Enamel From Wild Boar Living in the Fukushima Exclusion Zone. HEALTH PHYSICS 2019; 116:799-806. [PMID: 30889104 DOI: 10.1097/hp.0000000000001040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The goal of the study was to establish characteristics of Japanese wild boar tooth enamel in the dose region of 0.25-2.0 Gy and to reconstruct external absorbed doses to wild boar native to the Fukushima exclusion zone using electron paramagnetic resonance dosimetry. The significance of Japanese wild boar in their ecosystem and their position within the trophic hierarchy make the wild boar a species of particular importance and therefore, the focus of this study. Dose response linearity and variability of enamel originating from various wild boar were investigated. Radiation dose response of Japanese wild boar tooth enamel in the range of 0.25-2.0 Gy was found to be linear, and the average variation in dose response between teeth originating from the same boar specimen was nearly 30%. No statistically significant difference in dose response was found based on sex of the boar or in permanent molar teeth of boar of differing ages. Electron paramagnetic resonance absorbed doses to boar tooth enamel were successfully reconstructed using the calibration curve method and converted into estimates of absorbed dose to soft tissue with large associated confidence intervals. The critical level dose value for the calibration curve was 1.0 Gy and the detection limit dose was 1.8 Gy, suggesting that this method would be more beneficial for boar with lifetime absorbed doses greater than 1.0 Gy. The method of reconstructing external absorbed doses using electron paramagnetic resonance dosimetry with tooth enamel from Japanese wild boar as dosimeters has proven to be a viable method which can be used to reconstruct absorbed doses to wildlife in accident-stricken areas in the absence of alternative dosimetry.
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Affiliation(s)
- Amber Harshman
- 1Colorado State University Department of Environmental and Radiological Health Sciences, MRB Building, 1618 Campus Delivery, Fort Collins, CO 80523
| | - Thomas Johnson
- Colorado State University Department of Environmental and Radiological Health Sciences, MRB Building, 1618 Campus Delivery, Fort Collins, CO 80523
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