福島第一原発事故に起因する放射性物質による生活環境における土壌汚染に関する調査

摘要

Radioactive materials were released to the general environment due to the accident at the Fukushima Daiichi nuclear power station. The released radioactive materials fell and contaminated the land mainly in the Tohoku and Kanto areas of Japan. We surveyed the air dose rate in relation to the pave condition of the land, and investigated the contamination level in some nonpaved areas at the center of Fukushima City, Koriyama City, and Nasushiobara City. From the survey results, the dose rates of the nonpaved areas were found to be higher than those of the paved areas, and the dose rates of the paved areas depend on the paving materials of the area. The contamination level of the nonpaved area in Nasushiobara City was below the regulation level of specific activities in a radiation-controlled area in Japan. However, the contamination levels in the nonpaved areas in Fukushima City and Koriyama City were above the regulation level.%2011年3月11日に発生したマグニチュード9．0の東北地方太平洋沖地震とそれに引き続いて発生した津波により，東京電力が所有する福島第一原子力発電所（以下「1F」という。）の余熱除去系が機能不全に陥った。この機能不全により，1Fの1号炉建屋が2011年3月12日15時36分頃に爆発により破損，3号炉建屋も同月14日11時01分に爆発により破損した。