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福島第一原子力発電所事故に伴う放射性物質の長期的影響把握手法の確立,2; 放射性物質の第3次分布調査結果

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 2; Radiation monitoring and mapping of the radioactive substances distribution

三上 智 ; 島田 清貴; 中野 雅和; 佐藤 哲朗; 佐藤 あかね; 宇野 騎一郎; 関 暁之; 松元 愼一郎; 斎藤 公明

Mikami, Satoshi; Shimada, Kiyotaka; Nakano, Masakazu; Sato, Tetsuro; Sato, Akane; Uno, Kiichiro; Seki, Akiyuki; Matsumoto, Shinichiro; Saito, Kimiaki

福島第一原子力発電所から80km圏内を対象に、第3期目となる放射性物質等の分布調査を行った。5kmメッシュごとに1箇所を選び約380箇所でin-situ核種分析測定を行うとともに、1kmメッシュごとに1箇所を選び約6500箇所でサーベイメータによる測定を行いより精緻な空間線量率分布マップを作成した。また、1次や2次調査結果との比較により、空間線量率の変化傾向を調べ、考察した。

We conducted a monitoring and mapping of the radioactive substances distribution around the Fukushima Daiichi Nuclear Power Plant. In the area of 80 km radius from Fukushima Daiichi Nuclear Power Plant, ${it In-situ}$ measurements with portable Germanium detectors were conducted at approximately 380 points, and measurements with sureveymeters were done at approximately 6500 points. Newly acquired data were compared to the results obtained by the first or second investigation campaign in 2011.

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