Construction of precise contamination maps in the Fukushima site

福島サイト周辺の詳細な汚染地図の作成

斎藤 公明  ; 高橋 史明  ; 木内 伸幸 ; 三枝 純; 藤原 守*; 谷畑 勇夫*; 齊藤 敬*; 下浦 享*; 池内 嘉宏*

Saito, Kimiaki; Takahashi, Fumiaki; Kinouchi, Nobuyuki; Saegusa, Jun; Fujiwara, Mamoru*; Tanihata, Isao*; Saito, Takashi*; Shimoura, Susumu*; Ikeuchi, Yoshihiro*

Several different kinds of maps on contamination due to the Fukushima nuclear accident were constructed based on the results of extensive environmental monitoring conducted from June 6, 2011 to July 8 around the Fukushima site. More than 10,000 soil samples were collected at some 2,200 locations and analyzed to construct concentration maps for Cs, Cs, I, Te, Ag, Pu, Pu, Sr and Sr. At each location, the dose rate in air was measured by a calibrated survey meter. Car-borne surveys were performed using six taxis equipped with KURAMA systems which successively send dose and position data through a cellular network. Roads at more than 17,000 km were covered by the surveys. Bases on these data, dose rate distribution maps were constructed.