*Yoshifumi Wakiyama¹, Takuya Niida², Hyoe Takata¹, Keisuke Taniguchi³, Kazuki Fujita⁴, Alexei Konoplev¹, Yuichi Onda⁵ (1.Institute of Environmental Radioacitivity, Fukushima Universiy, 2.KANSO TECHNOS, CO. LTD., 3.National Institute of Technology, Tsuyama College, 4.Fukushima Prefectural Centre for Environmental Creation, 5.Center for Research in Isotope and Environmental Dynamics, University of Tsukuba)