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Report No.
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Construction of precise contamination maps in the Fukushima site

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 $$^{137}$$Cs, $$^{134}$$Cs, $$^{131}$$I, $$^{rm 129m}$$Te, $$^{rm 110m}$$Ag, $$^{238}$$Pu, $$^{239+240}$$Pu, $$^{89}$$Sr and $$^{90}$$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.

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