Mapping of the cumulative [beta]-ray dose on the ground surface surrounding the Fukushima area

A large amount of the fission products released by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident on 11 March 2011 was deposited in a wide area from Tohoku to northern Kanto. A map of the estimated cumulative [beta]-ray dose (70 [mu]m dose equivalent) on the soil surface for one year after the FDNPP accident has been prepared using previously reported calculation methods and the 2-km mesh survey data by MEXT. From this map of estimated dose, areas with a high cumulative [beta]-ray dose on the soil surface for one year after the FDNPP accident were found to be located in the Akogi-Teshichiro to Akogi-Kunugidaira region in Namie Town, and in the southern Futaba Town to the northern Tomioka Town region. The highest estimated cumulative [beta]-ray dose was 710 mSv for one year at Akogi-Teshichiro, Namie Town. Keywords: Fukushima Daiichi Nuclear Power Plant accident, [beta]-ray dose, radiotellurium, radioiodine, radiocesium