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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

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

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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