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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,4; 走行サーベイによる空間線量率分布測定

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 4; Measurement of air dose rate maps by a series of car-borne surveys

安藤 真樹  ; 松田 規宏 ; 佐藤 哲朗*; 斎藤 公明 

Ando, Masaki; Matsuda, Norihiro; Sato, Tetsuro*; Saito, Kimiaki

現状の空間線量率の分布状況及び変化傾向を把握するデータを取得することを目的として平成23年度から平成25年度にかけて東日本の広い範囲でKURAMA-IIシステムを用いた走行サーベイ測定を実施し道路上1mの空間線量率マップを作成した。これまでの合計7回の走行サーベイの結果から走行サーベイの減少傾向は、放射性セシウムの物理減衰やサーベイメータによる地上測定に比べて減衰が早いことが観測されている。また、平成25年度の測定では、道路上の空間線量率減少が減速しつつあることを示すデータが得られた。

A series of measurements of air-dose rate has been performed with a car-borne survey system KURAMA-II over wide areas in eastern Japan since 2011 to obtain data to grasp distribution of air dose rates and the decreasing tendency. Air dose rate maps were constructed by the seven car-borne surveys. It was found that the decreasing trend of air dose rates measured through car-borne surveys was found to be more pronounced than those expected on the basis of the physical decay of radioactive cesium and of the air dose rates measured using NaI (Tl) survey meters in the areas surrounding the roadways. In addition, it was found that the extent of decrease in air dose rates was moderated through the car-borne surveys performed in 2013.

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