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Ichiba K, Takebuchi Y, Kimura H, Kato T, Shiratori D, Nakauchi D, Kawaguchi N, Yanagida T. Synthesis of Tb-doped SiO2 glasses by spark plasma sintering method and evaluation of photoluminsecence and thermally stimulated luminescence properties. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2022.110515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Clustering Based Optimal Cluster Head Selection Using Bio-Inspired Neural Network in Energy Optimization of 6LowPAN. ENERGIES 2022. [DOI: 10.3390/en15134528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The goal of today’s technological era is to make every item smart. Internet of Things (IoT) is a model shift that gives a whole new dimension to the common items and things. Wireless sensor networks, particularly Low-Power and Lossy Networks (LLNs), are essential components of IoT that has a significant influence on daily living. Routing Protocol for Low Power and Lossy Networks (RPL) has become the standard protocol for IoT and LLNs. It is not only used widely but also researched by various groups of people. The extensive use of RPL and its customization has led to demanding research and improvements. There are certain issues in the current RPL mechanism, such as an energy hole, which is a huge issue in the context of IoT. By the initiation of Grid formation across the sensor nodes, which can simplify the cluster formation, the Cluster Head (CH) selection is accomplished using fish swarm optimization (FSO). The performance of the Graph-Grid-based Convolution clustered neural network with fish swarm optimization (GG-Conv_Clus-FSO) in energy optimization of the network is compared with existing state-of-the-art protocols, and GG-Conv_Clus-FSO outperforms the existing approaches, whereby the packet delivery ratio (PDR) is enhanced by 95.14%.
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Yasuda H, Iwao M. Time build-up properties of the weathering resistant radiophotoluminescence glass (SAPANS). RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Application of the buccal micronucleus cytome assay on child population exposed to sinus X-ray. Eur J Radiol 2020; 129:109143. [PMID: 32593079 DOI: 10.1016/j.ejrad.2020.109143] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 05/27/2020] [Accepted: 06/16/2020] [Indexed: 02/04/2023]
Abstract
PURPOSE Diagnostic X-ray examinations of paranasal sinuses use a low-dose ionizing radiation to achieve medically indicated purposes. The effects of low-dose radiation are still controversial, making it a highly prioritized field of research. As there is a need to evaluate the effects of low-dose ionizing radiation and that children might be a more vulnerable population, we performed simultaneous physical dosimetry and buccal cell micronucleus cytome assay on pediatric patients before and after an X-ray examination of the sinuses. METHODS The study comprised 20 subjects aged 11.9 ± 3.6 years, and BMI < 25 kg/m2. Physical dosimetry was performed using radiophotoluminiscent (RPL) glass dosimeters placed on four positions on the head. The buccal cell micronucleus cytome assay was performed before and 14 ± 1 days after the X-ray exam, to monitor DNA damaging, replicative, cytostatic, and cell death effects. RESULTS The doses in the primary beam ranged 371-1106 μGy and were several fold higher than at the other positions on the head. As for biological changes, we did not observe any DNA damaging effects. However, a significant increase in cells with condensed chromatin was observed, indicating more cells undergoing early stages of apoptosis. We also observed inter-individual differences between the subjects. A correlation between the doses detected and biological effects was not observed. CONCLUSION Although we did not observe significant increase in DNA damage, further studies are needed to increase the statistical power of the results and ensure patients' safety and optimal health care.
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Kawasaki T, Sakakubo M, Ito K, Kitagawa A. ESTIMATION OF ORGAN DOSES AND EFFECTIVE DOSES BASED ON IN-PHANTOM DOSIMETRY FOR PAEDIATRIC DIAGNOSTIC CARDIAC CATHETERISATION. RADIATION PROTECTION DOSIMETRY 2019; 185:215-221. [PMID: 30624664 DOI: 10.1093/rpd/ncy298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Revised: 11/29/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
The present study evaluated the organ doses, effective doses and conversion factors from the dose-area product to effective dose in pediatric diagnostic cardiac catheterization performed by in-phantom dosimetry and Monte Carlo simulation. The organ and effective doses in 5-y-olds during diagnostic cardiac catheterizations were evaluated using radiophotoluminescence glass dosemeters implanted into a pediatric anthropomorphic phantom and PCXMC software. The mean effective dose was 3.8 mSv (range: 1.8-7.5 mSv). The conversion factors from the dose-area product to effective dose were 0.9 and 1.6 mSv (Gy cm2)-1 for posteroanterior and lateral fluoroscopy, respectively, and 0.9 and 1.5 mSv (Gy cm2)-1 for posteroanterior and lateral cineangiography, respectively. Effective doses evaluated using the pediatric dosimetry system agreed with those obtained using PCXMC software within 12%. The dose data and conversion factors evaluated may guide the estimation of exposure doses in children undergoing diagnostic cardiac catheterization.
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Affiliation(s)
- Toshio Kawasaki
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
| | - Masami Sakakubo
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
| | - Kanako Ito
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
| | - Ai Kitagawa
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
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Kawasaki T, Sakakubo M, Ito K. ESTIMATION OF ORGAN DOSES AND EFFECTIVE DOSES BASED ON IN-PHANTOM DOSIMETRY FOR INFANT DIAGNOSTIC CARDIAC CATHETERISATIONS WITH NOVEL X-RAY IMAGING TECHNOLOGY. RADIATION PROTECTION DOSIMETRY 2019; 183:528-533. [PMID: 30289542 DOI: 10.1093/rpd/ncy174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 08/29/2018] [Accepted: 09/19/2018] [Indexed: 06/08/2023]
Abstract
The present study evaluated the organ and effective doses in infant diagnostic cardiac catheterisation performed using a modern x-ray imaging unit by in-phantom dosimetry. In addition, conversion factors from dose-area product (DAP) to effective dose were determined. The organ and effective doses in 1-year old during diagnostic cardiac catheterisations were measured using radiophotoluminescence glass dosemeters implanted into an infant anthropomorphic phantom. The mean effective doses, evaluated according to the International Commission on Radiologic Protection Publication 103, were 4.0 mSv (range: 1.5-8.7 mSv). The conversion factors from DAP to effective dose were 2 and 3.5 mSv (Gy cm2)-1 for posteroanterior and lateral fluoroscopy, respectively, and 1.8 and 3.3 mSv (Gy cm2)-1 for posteroanterior and lateral cineangiography, respectively. The dose data and conversion factors evaluated in the present study may be useful for estimating radiation exposure in infants during diagnostic cardiac catheterisation.
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Affiliation(s)
- Toshio Kawasaki
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
| | - Masami Sakakubo
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
| | - Kanako Ito
- Department of Radiological Technology, Kanagawa Children's Medical Centre, Mutsukawa 2-138-4, Minami-ku, Yokohama, Japan
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De Saint-Hubert M, Majer M, Hršak H, Heinrich Z, Kneževic Ž, Miljanic S, Porwol P, Stolarczyk L, Vanhavere F, Harrison RM. OUT-OF-FIELD DOSES IN CHILDREN TREATED FOR LARGE ARTERIOVENOUS MALFORMATIONS USING HYPOFRACTIONATED GAMMA KNIFE RADIOSURGERY AND INTENSITY-MODULATED RADIATION THERAPY. RADIATION PROTECTION DOSIMETRY 2018; 181:100-110. [PMID: 29351691 DOI: 10.1093/rpd/ncx301] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
The purpose of this study was to measure out-of-field organ doses in two anthropomorphic child phantoms for the treatment of large brain arteriovenous malformations (AVMs) using hypofractionated gamma knife (GK) radiosurgery and to compare these with an alternative treatment using intensity-modulated radiation therapy (IMRT). Target volume was identical in size and shape in all cases. Radiophotoluminescent (RPL), thermoluminescent (TL) and optically stimulated luminescent (OSL) dosimeters were used for out-of-field dosimetry during GK treatment and a good agreement within 1-2% between results was shown. In addition, the use of multiple dosimetry systems strengthens the reliability of the findings. The number of GK isocentres was confirmed to be important for the magnitude of out-of-field doses. Measured GK doses for the same distance from the target, when expressed per target dose and isocentre, were comparable in both phantoms. GK out-of-field doses averaged for both phantoms were evaluated to be 120 mGy/Gy for eyes then sharply reduced to 20 mGy/Gy for mandible and slowly reduced up to 0.8 mGy/Gy for testes. Taking into account the fractionation regimen used to treat AVM patients, the total treatment organ doses to the out-of-field organs were calculated and compared with IMRT. The eyes were better spared with GK whilst for more distant organs doses were up to a factor of 2.8 and 4 times larger for GK compared to IMRT in 5-year and 10-year old phantoms, respectively. Presented out-of-field dose values are specific for the investigated AVM case, phantoms and treatment plans used for GK and IMRT, but provide useful information about out-of-field dose levels and emphasise their importance.
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Affiliation(s)
| | - Marija Majer
- Ruder Boškovic Institute, Bijenicka c. 54, Zagreb, Croatia
| | - Hrvoje Hršak
- University Hospital Centre Zagreb, Kišpaticeva, Zagreb, Croatia
| | | | | | | | - Paulina Porwol
- Radiology Therapeutic Centre Poland SP. Z O.O., os. Zlotej Jesieni 1, Kraków, Poland
| | - Liliana Stolarczyk
- Institute of Nuclear Physics PAS, Krakow, Radzikowskiego 152, Krakow, Poland
| | - Filip Vanhavere
- Belgium Nuclear Research Centre (SCK-CEN), Boeretang 200, Mol, Belgium
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Synthesis and characterization of spherical radiophotoluminescence glass detectors by melting method. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.03.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Majer M, Stolarczyk L, De Saint-Hubert M, Kabat D, Kneževic Ž, Miljanic S, Mojzeszek N, Harrison R. OUT-OF-FIELD DOSE MEASUREMENTS FOR 3D CONFORMAL AND INTENSITY MODULATED RADIOTHERAPY OF A PAEDIATRIC BRAIN TUMOUR. RADIATION PROTECTION DOSIMETRY 2017; 176:331-340. [PMID: 28338841 DOI: 10.1093/rpd/ncx015] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/29/2017] [Indexed: 05/03/2023]
Abstract
The purpose of this study was to measure out-of-field organ doses in clinical conditions in anthropomorphic paediatric phantoms which received a simulated treatment of a brain tumour with intensity modulated radiotherapy (IMRT) and 3D conformal radiotherapy (3D CRT). Organ doses measured with radiophotoluminescent and thermoluminescent dosemeters were on average 1.6 and 3.0 times higher for the 5 y-old than for the 10 y-old phantom for IMRT and 3D CRT, respectively. A larger 5-y to 10-y organ dose ratio for 3D CRT can be explained because the use of a mechanical wedge for the 5-y-old 3D CRT phantom treatment increased out-of-field doses. Due to different configurations of the radiation fields, for both phantoms, the IMRT technique resulted in a higher non-target brain dose and higher eye doses but lower thyroid doses compared to 3D CRT. For 3D CRT (which used a non-coplanar field configuration), eye doses were 3-6% and for IMRT (which used a coplanar field configuration) 27-30% of the treatment dose, respectively. For thyroid and more distant organs, doses were less than 1% of the treatment dose. Comparison of measured doses and doses calculated by the treatment planning system (TPS) showed that the TPS underestimated out-of-field doses both for IMRT and 3D CRT.
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Affiliation(s)
- Marija Majer
- Ruder Boškovic Institute, Bijenicka cesta 54, 10000 Zagreb, Croatia
| | - Liliana Stolarczyk
- Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Krakow, Poland
| | | | - Damian Kabat
- Centre of Oncology M. Sklodowska-Curie Memorial Institute, Garncarska 11, 31-115 Krakow, Poland
| | - Željka Kneževic
- Ruder Boškovic Institute, Bijenicka cesta 54, 10000 Zagreb, Croatia
| | - Saveta Miljanic
- Ruder Boškovic Institute, Bijenicka cesta 54, 10000 Zagreb, Croatia
| | - Natalia Mojzeszek
- Institute of Nuclear Physics PAN, Radzikowskiego 152, 31-342 Krakow, Poland
| | - Roger Harrison
- University of Newcastle, Faculty of Medical Sciences, Newcastle upon Tyne NE2 4HH, UK
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Majer M, Knežević Ž, Liu H, Hršak H, Miljanić S, Zhuo W, Heinrich Z. Paediatric organ doses from CT-simulation in brain tumour GK radiosurgery treatment – Phantom study. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.03.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Wesolowska PE, Cole A, Santos T, Bokulic T, Kazantsev P, Izewska J. Characterization of three solid state dosimetry systems for use in high energy photon dosimetry audits in radiotherapy. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.04.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Silva EH, Knežević Ž, Struelens L, Covens P, Ueno S, Vanhavere F, Buls N. ENERGY AND ANGULAR DEPENDENCE OF RADIOPHOTOLUMINESCENT GLASS DOSEMETERS FOR EYE LENS DOSIMETRY. RADIATION PROTECTION DOSIMETRY 2016; 170:208-212. [PMID: 27143793 DOI: 10.1093/rpd/ncw104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Recent studies demonstrated that lens opacities can occur at lower radiation doses than previously accepted. In view of these studies, the International Commission of Radiological Protection recommended in 2011 to reduce the eye lens dose limit from 150 mSv/y to 20 mSv/y. This implies in the need of monitoring doses received by the eye lenses. In this study, small rod radiophotoluminescent glass dosemeters (GD-300 series; AGC, Japan) were characterized in terms of their energy (ISO 4037 X-rays narrow spectrum series, S-Cs and S-Co) and angular dependence (0 up to 90 degrees, with 2 ISO energies: N-60 and S-Cs). All acquisitions were performed at SCK•CEN-Belgium, using the ORAMED proposed cylindrical phantom. For selected energies (N-60, N-80, N-100, N-120 and N-250), the response of dosemeters irradiated on the ISO water slab phantom, at the Ruđer Bošković Institute-Croatia, was compared to those irradiated on the cylindrical phantom. GD-300 series showed good energy dependence, relative to S-Cs, on the cylindrical phantom. From 0 up to 45 degrees, the dosemeters showed no significant angular dependence, regardless whether they were tested when placed vertically or horizontally on the cylindrical phantom. However, at higher angles, some angular dependence was observed, mainly when the dosemeters were irradiated with low-energy photons (N-60). Results showed that GD-300 series have good properties related to Hp(3), although some improvements may be necessary.
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Affiliation(s)
- E H Silva
- Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, 2400 Mol, Belgium Vrije Universiteit Brussel (VUB), LABO and BEFY, Laarbeeklaan 103, 1090 Brussels, Belgium CAPES Foundation, Ministry of Education of Brazil, Brasília, DF 70040-020, Brazil
| | - Ž Knežević
- Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
| | - L Struelens
- Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, 2400 Mol, Belgium
| | - P Covens
- Vrije Universiteit Brussel (VUB), LABO and BEFY, Laarbeeklaan 103, 1090 Brussels, Belgium Department of Radiation Protection (VUB), Laarbeeklaan 103, 1090 Brussels, Belgium
| | - S Ueno
- Oarai Research Center, Chiyoda Technol Corporation, 3681 Naritacho, Oarai-machi, Higashiibaraki-gun, Ibaraki 311-1313, Japan
| | - F Vanhavere
- Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, 2400 Mol, Belgium
| | - N Buls
- Vrije Universiteit Brussel (VUB), LABO and BEFY, Laarbeeklaan 103, 1090 Brussels, Belgium Department of Radiology, UZ Brussel, Laarbeeklaan 101, 1090 Brussels, Belgium
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Evaluation based on Monte Carlo simulation of lifetime attributable risk of cancer after neck X-ray radiography. Radiol Med 2015; 120:1043-9. [DOI: 10.1007/s11547-015-0543-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2014] [Accepted: 04/16/2015] [Indexed: 11/26/2022]
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Seo D, Jang S, Kim J, Kim J, Sung D, Kim H, Yoon Y. A comparative assessment of entrance surface doses in analogue and digital radiography during common radiographic examinations. RADIATION PROTECTION DOSIMETRY 2014; 158:22-27. [PMID: 23887271 DOI: 10.1093/rpd/nct189] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Digital radiography is often performed at a higher dose rate than analogue radiography for image acquisition. The authors measured the Entrance Surface Dose (ESD) of analogue and digital radiography techniques for 14 radiographic examinations from randomly selected medical centres in the central district of Korea. It was that the mean ESD of the digital examinations was 2.84 mGy (range, 0.37-6.38 mGy) and that of the analogue examinations was 1.83 mGy (range, 0.38-4.74 mGy), resulting in a 55.25 % higher ESD for digital technique. Although this survey is not completely representative of Korea, findings of this study indicate a need for closer exposure management in digital radiography to minimise patient dose.
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Affiliation(s)
- Deoknam Seo
- Department of Radiologic Science, College of Health Science, Korea University, Seoul 136-703, Republic of Korea
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Photon dosimetry methods outside the target volume in radiation therapy: Optically stimulated luminescence (OSL), thermoluminescence (TL) and radiophotoluminescence (RPL) dosimetry. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2013.03.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Miljanić S, Hršak H, Knežević Ž, Majer M, Heinrich Z. Peripheral doses in children undergoing Gamma Knife radiosurgery and second cancer risk. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2012.09.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Sato F, Toyota Y, Maki D, Zushi N, Kato Y, Yamamoto T, Iida T. Development of bead-type radiophotoluminescence glass dosimeter applicable to various purposes. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2012.06.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kurobori T, Nakamura S. A novel disk-type X-ray area imaging detector using radiophotoluminescence in silver-activated phosphate glass. RADIAT MEAS 2012. [DOI: 10.1016/j.radmeas.2012.09.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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