Conversion Factor From Dosemeter Reading to Air Kerma for Nuclear Worker Using Anthropomorphic Phantom for Further Conversion From Air Kerma to Organ-Absorbed Dose

Furuta, Hiroshige; Tsujimura, Norio; Nishide, Akemi; Kudo, Shinichi; Saigusa, Shin

doi:10.1093/rpd/ncaa051

Cited by 5 publications

(14 citation statements)

References 17 publications

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“…The bias factor B 2 was defined as the dosimeter reading per air kerma by dosimeter type and nuclear facility type. Table 5 , “Dosemeter response and uncertainty by dosemeter type and nuclear facility type,” in Furuta et al (2020a) shows bias B 2 and uncertainty K 2 for GB, EPD, and LB, while Figure 6, “Dosimeter response per air kerma in the work environment experienced by nuclear workers by dosimeter type and nuclear facility type,” in Furuta et al (2020a) shows the B 2 for old FB, multi-element FB, and TLD.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“… a Note: (1) Dosimeter response B 2 and uncertainty K 2 for GB, EPD, and LB cited Table 5 of Furuta et al (2020a) . (2) Dosimeter response B 2 for old FB, multi-element FB, and TLD refers to Figure 6 in Furuta et al (2020a) . (3) Uncertainty K 2 for old FB, multi-element FB, and TLD were determined according to Table 7 of Furuta et al (2020a) , along with the uncertainties in NPP or MA that were computed as the weighted average of uncertainties derived from the SD/mean in Table 3 of Thierry-Chef et al (2002) .…”

Section: Methodsmentioning

confidence: 99%

“…The 15-Country study examined the dosimeter response to photon exposure for the dosimeter types FB and TLD. To supplement data for the dosimeter types recently in use, the J-EPISODE experimented on the dosimeter response for radio-photoluminescent glass dosimeters (glass badges [GBs]), active personal dosimeters (hereinafter called electronic personal dosimeter [EPDs]), and optically stimulated luminescence dosimeters (Luminess badges [LBs]) using a device that irradiated an anthropomorphic phantom in the Japan Atomic Energy Agency (JAEA) calibration laboratories, as described by Furuta et al (2020a) . The obtained data were consistent with those in the 15-Country study;…”

Section: Introductionmentioning

confidence: 99%

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Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

et al. 2021

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An evaluation of cancer risk based on organ-absorbed dose is underway for the Japanese Epidemiological Study on Low-Dose Radiation Effects (J-EPISODE), which has analyzed health effects in association with radiation exposure evaluated with the personal dose equivalent H p (10). Although the concept of effective dose and its operational definition of H p (10) are widely used for radiological protection purposes, effective dose is not recommended for epidemiological evaluation. Organ-absorbed dose was instead adopted for the IARC 15-Country Collaborative study (15-Country study), the International Nuclear Workers Study (INWORKS), the Mayak worker study, and the Life Span Study (LSS) of atomic bomb survivors. The reconstruction method in J-EPISODE followed in principle the approach adopted in the 15-Country Study. As part of the approach of J-EPISODE, a conversion factor from photon dosimeter reading to air kerma was developed using dosimeter response data, which were measured by the experiment using an anthropomorphic phantom, and it was confirmed that the 15-Country study’s assumption of photon energy and geometry distribution in a work environment applied to Japanese nuclear workers. This article focuses on a method for reconstructing the conversion factor from photon dosimeter reading to organ-absorbed photon dose for a Japanese nuclear worker cohort. The model for estimating the conversion factor was defined under the assumption of a lognormal distribution from three concerned bias factors: (1) a dosimeter reading per air kerma, i.e., dosimeter response; (2) an organ-absorbed dose per air kerma; and (3) a factor relating to the differences in dose concepts and calibration practices between the roentgen dosimeter era and the present. Dosimeter response data were cited from the companion paper. Data on organ-absorbed photon dose per air kerma were estimated using a voxel phantom with the average Japanese adult male height and weight. The bias factor for the recorded dose in the roentgen era was defined, considering the backscatter radiation from the human body. The estimated values of organ-absorbed photon dose per air kerma were almost the same as those in ICRP Publication 116, revealing that the effect of differences in body size was almost negligible. The conversion factors from dosimeter reading to organ-absorbed dose were estimated by period (the roentgen era or from then), nuclear facility type (nuclear power plant or other), dosimeter type, and tissue or organ. The estimated conversion factors ranged from 0.7 to 0.9 (Gy Sv −1 ). The estimated cumulative organ-absorbed photon dose for the participants of J-EPISODE demonstrated that organ-absorbed dose values were approximately 0.8 times the recorded doses if neglecting dose-unit differences. J-EPISODE reconstructed an organ-absorbed dose conversion factor and will evaluate the risk of cancer mortality and morbidity using the organ-absorbe...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

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“…Reflecting the above result of literature survey, conversion factor from dosemeter reading to air kerma for nuclear worker for further conversion from air kerma to organ-absorbed dose was constructed in the preceding paper of Furuta et al . (2020) ( 16 ) .…”

Section: Introductionmentioning

confidence: 99%

Estimation of Photon Energy and Direction Distributions at Japanese Nuclear Power Plants Based on Literature Survey for J-Episode Study

Furuta

Nishide

Kudo

et al. 2020

Radiation Protection Dosimetry

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In order to reconstruct organ-absorbed dose from recorded dose for risk estimation in nuclear worker cohort, the preceding study of the International Agency for Research on Cancer (IARC) 15-Country Collaborative Study estimated the organ dose conversion factor from the recorded dose of Hp(10) under the assumption that on average, in the nuclear power plants (NPPs), 10% of the dose received by workers was due to photon energies ranging from 100 to 300 keV and 90% from photon energies ranging from 300 to 3000 keV, with the average geometry being 50% in the antero-posterior geometry and 50% in the isotropic geometry. Similar examination was conducted at the Japanese Epidemiological Study on Low-Dose Radiation Effects (J-EPISODE). Literature survey disclosed that Japanese electric power companies had jointly conducted the research on energy distribution and incidence direction distribution of gamma rays in working environments during periodical inspection and maintenance as well as during operation in the 1980s. The analysis of the survey results on photon energy and geometry distribution of Japanese NPPs demonstrated appropriateness in applying the IARC study assumption for nuclear workers in Japan and reconstructing organ-absorbed dose in the J-EPISODE. These results in Japan also provide strong evidence to support the robustness and generality of the IARC study assumption, which was estimated based on the judgment of experts at nuclear facilities around the world.

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Reanalysis of cancer mortality using reconstructed organ-absorbed dose: J-EPISODE 1991‒2010

et al. 2022

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Conversion Factor From Dosemeter Reading to Air Kerma for Nuclear Worker Using Anthropomorphic Phantom for Further Conversion From Air Kerma to Organ-Absorbed Dose

Cited by 5 publications

References 17 publications

Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

Organ Dose Reconstruction Applicable for a Japanese Nuclear Worker Cohort: J-EPISODE

Estimation of Photon Energy and Direction Distributions at Japanese Nuclear Power Plants Based on Literature Survey for J-Episode Study

Reanalysis of cancer mortality using reconstructed organ-absorbed dose: J-EPISODE 1991‒2010

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