量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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A large amount of radionuclides were released into the environment by the Fukushima Daiichi Nuclear Power Plant (FNPP) accident on 11 March 2011. To understand the contaminated situation of Chiba city, the fallout deposition of 131I and 137Cs and inventory of 137Cs in a soil were investigated at National Institute of Radiological Sciences (NIRS) located about 200 km south-southwest of FNPP. Sampling of the fallout deposition was carried out from 15 March to 22 April 2011. The largest depositions of 131I and 137Cs were observed at 21 March, 7:00-16:00. The day was the first rainy day around Kanto Plain after the emergency release of steam from FNPP on March 13 and 15. Radiation doses at NIRS were also increased after the largest deposition. The 137Cs inventory of the soils at NIRS was estimated to 13.2 kBq m-2.
東京電力福島第一原子力発電所事故後の放医研における放射能調査
