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Tetsuo Ishikawa, Seiji Yasumura, Keiichi Akahane, Shunsuke Yonai, Akira Ohtsuru, Akira Sakai, Tetsuya Ohira, Kenji Kamiya, AGE DEPENDENCE OF INDIVIDUAL EXTERNAL DOSES IN AN EARLY STAGE AFTER THE FUKUSHIMA NUCLEAR ACCIDENT, Radiation Protection Dosimetry, Volume 188, Issue 2, February 2020, Pages 238–245, https://doi.org/10.1093/rpd/ncz281
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Abstract
Individual external doses for the first 4 months after the Fukushima accident have been estimated by the ‘Basic Survey’ of the Fukushima Health Management Survey. On the other hand, the UNSCEAR 2013 report presented the first-year effective dose due to external radiation for each municipality in nonevacuated areas of Fukushima Prefecture. In this study, the doses estimated by the Basic Survey were averaged for each of three age groups (infants, 0–5 y; children, 6–15 y; and adults, >16 y), in accordance with the categories adopted by the UNSCEAR report. The average dose ratios (infants/adults and children/adults) obtained from the Basic Survey were 1.08 and 1.06 for nonevacuated areas, respectively. These were smaller than the estimation by the UNSCEAR report (1.7 and 1.4, respectively). Three factors (body size factor, location factor and occupancy factor) were discussed and the location and occupancy factors were likely to be reasons for the difference.