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福島における放射性物質の分布状況調査と関連研究,2; 広域走行サーベイによる空間線量率の経時変化

Mapping project in Fukushima and related researches, 2; Changing trends of air dose rates measured by car-borne surveys in wide area

安藤 真樹  ; 斎藤 公明  ; 松田 規宏  

Ando, Masaki; Saito, Kimiaki; Matsuda, Norihiro

福島第一原子力発電所事故に伴う放射性物質による空間線量率分布状況調査の一環として、KURAMA-IIモニタリング装置等を用いた広域走行サーベイが2011年度以降継続的に実施され、東日本での空間線量率測定データが蓄積されている。膨大な測定データを活用し地域毎に空間線量率経時変化を調べた結果、避難指示区域内外や県により空間線量率の減衰傾向が異なることが分かった。

As part of the investigation on distribution of air dose rates around the Fukushima Daiichi Nuclear Power Plant, car-borne surveys using KURAMA-II has been conducted over a wide area since 2011, and the measurement data of the air dose rates in the eastern Japan have been accumulated. The enormous amount of measurement data of the air dose rates were analyzed, and the decreasing trend of air dose rates was found to be depending on the evacuation order areas and the prefecture.

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