Reduction factors for wooden houses due to external γ-radiation based on in situ measurements after the Fukushima nuclear accident

Hiroko Yoshida-Ohuchi, Masahiro Hosoda, Takashi Kanagami, Masaki Uegaki, Hideo Tashima

研究成果: Article査読

14 被引用数 (Scopus)

抄録

For estimation of residents' exposure dose after a nuclear accident, the reduction factor, which is the ratio of the indoor dose to the outdoor dose is essential, as most individuals spend a large portion of their time indoors. After the Fukushima nuclear accident, we evaluated the median reduction factor with an interquartile range of 0.43 (0.34-0.53) based on 522 survey results for 69 detached wooden houses in two evacuation zones, Iitate village and Odaka district. The results indicated no statistically significant difference in the median reduction factor to the representative value of 0.4 given in the International Atomic Energy Agency (IAEA)-TECDOC-225 and 1162. However, with regard to the representative range of the reduction factor, we recommend the wider range of 0.2 to 0.7 or at least 0.2 to 0.6, which covered 87.7% and 80.7% of the data, respectively, rather than 0.2 to 0.5 given in the IAEA document, which covered only 66.5% of the data. We found that the location of the room within the house and area topography, and the use of cement roof tiles had the greatest influence on the reduction factor.

本文言語English
論文番号7541
ジャーナルScientific reports
4
DOI
出版ステータスPublished - 2014 12 18

ASJC Scopus subject areas

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