@article{oai:repo.qst.go.jp:00076307,
 author = {Eunjoo, Kim and Yajima, Kazuaki and Hashimoto, Shozo and Tani, Kotaro and Igarashi, Yu and Iimoto, Takeshi and Ishigure, Nobuhito and Tatsuzaki, Hideo and Akashi, Makoto and Kurihara, Osamu and Eunjoo, Kim and Kazuaki, Yajima and Shozo, Hashimoto and Kotaro, Tani and Yu, Igarashi and Takeshi, Iimoto and Nobuhito, Ishigure and Hideo, Tatsuzaki and Makoto, Akashi and Osamu, Kurihara},
 issue = {1},
 journal = {Health Physics},
 month = {Jan},
 note = {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 thyroid internal doses of Fukushima residents mainly from their intake of 131I due to the lack of direct measurements. Only about 1,300 data of the residents related to 131I have been available, and 1,080 of the data were obtained from the screening campaign that was conducted by the Nuclear Emergency Response Local Headquarter at the end of March 2011 in Kawamata-town, Iwaki-city, and Iitate-village. Here, we reassessed the thyroid doses of the 1,080 subjects aged  15-y-old by using new age-specific conversion factors to determine the 131I thyroid contents from net signals of the devices used, with consideration of the possible uncertainty related to the measurements. The results demonstrated that the thyroid equivalent doses of the subjects were < 30 mSv (excluding outliers). We also demonstrate the 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 131I 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 for Iitate-village were similar to that for Iwaki-city even though the 131I concentration in tap water was much higher in Iitate-village than Iwaki-city. The range of thyroid doses for Minamisoma-city was similar to those for Iitate-village and Iwaki-city, and the range for Fukushima-city was smallest among the five municipalities. Since the major route of intake has remained unclear, this paper presented the plausible upper and lower thyroid doses, between which the actual doses are thought to exist mostly, based on the 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 thyroid internal dose assessment.},
 pages = {36--52},
 title = {Reassessment of Internal Thyroid Doses to 1,080 Children Examined in a Screening Survey after the 2011 Fukushima Nuclear Disaster},
 volume = {118},
 year = {2020}
}