*Yoshifumi Wakiyama¹, Alexei Konoplev¹, Valentin Golosov², Maxim Ivanov², Mikhail Komissarov³ (1.Institute of Environmental Radioacitivity, Fukushima Universiy, 2.Faculty of Geography, M.V. Lomonosov Moscow State University, 3.Ufa Institute of Biology UFRC, Russian Academy of Science)