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Please use this identifier to cite or link to this item: http://ir.fmu.ac.jp/dspace/handle/123456789/1592

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Title: Difference in the Cesium Body Contents of Affected Area Residents Depending on the Evacuation Timepoint Following the 2011 Fukushima Nuclear Disaster
Authors: Igarashi, Yu
Kim, Eunjoo
Hashimoto, Shozo
Tani, Kotaro
Yajima, Kazuaki
Iimoto, Takeshi
Ishikawa, Tetsuo
Akashi, Makoto
Kurihara, Osamu
Affiliation: 放射線物理化学講座
Source title: Health physics
Volume: 119
Issue: 6
Start page: 733
End page: 745
Issue Date: Dec-2020
Abstract: Estimating the internal thyroid dose received by residents involved in the 2011 Fukushima Daiichi Nuclear Power Plant (FDNPP) accident has been a challenging task because of the shortage of direct human measurements related to the largest contributing radioisotope to the dose, I. In a previous dose estimation, we used the results of whole-body counter (WBC) measurements targeting Cs and Cs, based on the assumption that these radioisotopes were incorporated at the same time as I in the early phase of the accident. The main purpose of this study was to clarify whether the trace of the early intake remained in the WBC measurements that were started several months after the accident. In the present work, WBC data of 1,639 persons from Namie town, one of the heavily contaminated municipalities, were analyzed together with their evacuation behavior data. The results demonstrated that the cesium detection rate in the WBC results was several times higher in the late evacuees [who evacuated outside the 20-km radius of the FDNPP at 3:00 p.m. (Japanese Local Time) on 12 March or later] compared to the prompt evacuees (who evacuated before 3:00 p.m. on 12 March). Among the adults, the cesium detection rates (and the 90th percentile values of the Cs intake) of the prompt and late evacuees were about 20% (5.4 × 10 Bq) and 60% (1.6 × 10 Bq), respectively. Approximately 20% of the individuals analyzed were categorized as late evacuees. These differences in cesium would be caused by exposure to the radioactive plume in the afternoon on 12 March, which was likely to influence the late evacuees. On the other hand, the intake on 15 March, when the largest release event occurred, was expected to be relatively small for Namie town's residents. In conclusion, the trace of the early intake remained in the WBC measurements, although this would not necessarily be true for all subjects. The results obtained from this study would provide useful information for the reconstruction of the early internal thyroid doses from radioiodine in the future.
Publisher: Lippincott Williams & Wilkins
language: eng
URI: http://ir.fmu.ac.jp/dspace/handle/123456789/1592
Full text URL: http://ir.fmu.ac.jp/dspace/bitstream/123456789/1592/1/HealthPhys_119_p733.pdf
ISSN: 0017-9078
DOI: 10.1097/HP.0000000000001249
PubMed ID: 32384372
Other version: https://doi.org/10.1097/HP.0000000000001249
Rights: © 2020 Health Physics Society. This is a non-final version of an article published in final form in "Health Phys. 2020 Dec;119(6):733-745".
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e110 学術雑誌論文等 = Journal Article

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