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Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima

Significant differences in findings were seen between the intake amounts of iodine-131 that were derived from direct measurements and the estimated intake from environmental monitoring data at the Fukushima accident. To clarify these discrepancies, we have investigated the iodine-131 and tellurium-1...

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Autores principales: Uchiyama, Koji, Miyashita, Masami, Tanishima, Yoshinobu, Maeda, Shigenobu, Sato, Hitoshi, Yoshikawa, Jun, Watanabe, Shuji, Shibata, Masamichi, Ohhira, Shuji, Kobashi, Gen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5877028/
https://www.ncbi.nlm.nih.gov/pubmed/29522502
http://dx.doi.org/10.3390/ijerph15030483
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author Uchiyama, Koji
Miyashita, Masami
Tanishima, Yoshinobu
Maeda, Shigenobu
Sato, Hitoshi
Yoshikawa, Jun
Watanabe, Shuji
Shibata, Masamichi
Ohhira, Shuji
Kobashi, Gen
author_facet Uchiyama, Koji
Miyashita, Masami
Tanishima, Yoshinobu
Maeda, Shigenobu
Sato, Hitoshi
Yoshikawa, Jun
Watanabe, Shuji
Shibata, Masamichi
Ohhira, Shuji
Kobashi, Gen
author_sort Uchiyama, Koji
collection PubMed
description Significant differences in findings were seen between the intake amounts of iodine-131 that were derived from direct measurements and the estimated intake from environmental monitoring data at the Fukushima accident. To clarify these discrepancies, we have investigated the iodine-131 and tellurium-132 body burdens of five human subjects, who after being exposed to a radioactive plume, underwent 21.5 h whole body counter measurements at Fukui Prefectural Hospital, so clear intake scenario and thyroid counter measurement data were available. To determine the iodine-131 and tellurium-132 body burdens, we introduced a new method of whole body counter calibration composed of a self-consistent approach with the time-dependent correction efficiency factors concept. The ratios of iodine-131 to tellurium-132, ranging from 0.96 ± 0.05 to 2.29 ± 0.38, were consistent with results of the environmental measurements. The 24 h iodine uptake values ranging from 12.1–16.0% were within euthyroid range in Japanese people. These results suggest, even if the relatively low thyroid iodine uptake in the Japanese population was taken into consideration, that there is no doubt about the consistency between direct measurements and environmental monitoring data. Adequate intake scenario is suggested to be principally important to estimate the inhaled radioactivity in areas in or around nuclear accidents.
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spelling pubmed-58770282018-04-09 Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima Uchiyama, Koji Miyashita, Masami Tanishima, Yoshinobu Maeda, Shigenobu Sato, Hitoshi Yoshikawa, Jun Watanabe, Shuji Shibata, Masamichi Ohhira, Shuji Kobashi, Gen Int J Environ Res Public Health Article Significant differences in findings were seen between the intake amounts of iodine-131 that were derived from direct measurements and the estimated intake from environmental monitoring data at the Fukushima accident. To clarify these discrepancies, we have investigated the iodine-131 and tellurium-132 body burdens of five human subjects, who after being exposed to a radioactive plume, underwent 21.5 h whole body counter measurements at Fukui Prefectural Hospital, so clear intake scenario and thyroid counter measurement data were available. To determine the iodine-131 and tellurium-132 body burdens, we introduced a new method of whole body counter calibration composed of a self-consistent approach with the time-dependent correction efficiency factors concept. The ratios of iodine-131 to tellurium-132, ranging from 0.96 ± 0.05 to 2.29 ± 0.38, were consistent with results of the environmental measurements. The 24 h iodine uptake values ranging from 12.1–16.0% were within euthyroid range in Japanese people. These results suggest, even if the relatively low thyroid iodine uptake in the Japanese population was taken into consideration, that there is no doubt about the consistency between direct measurements and environmental monitoring data. Adequate intake scenario is suggested to be principally important to estimate the inhaled radioactivity in areas in or around nuclear accidents. MDPI 2018-03-09 2018-03 /pmc/articles/PMC5877028/ /pubmed/29522502 http://dx.doi.org/10.3390/ijerph15030483 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Uchiyama, Koji
Miyashita, Masami
Tanishima, Yoshinobu
Maeda, Shigenobu
Sato, Hitoshi
Yoshikawa, Jun
Watanabe, Shuji
Shibata, Masamichi
Ohhira, Shuji
Kobashi, Gen
Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title_full Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title_fullStr Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title_full_unstemmed Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title_short Use of Iodine-131 to Tellurium-132 Ratios for Assessing the Relationships between Human Inhaled Radioactivity and Environmental Monitoring after the Accident in Fukushima
title_sort use of iodine-131 to tellurium-132 ratios for assessing the relationships between human inhaled radioactivity and environmental monitoring after the accident in fukushima
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5877028/
https://www.ncbi.nlm.nih.gov/pubmed/29522502
http://dx.doi.org/10.3390/ijerph15030483
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