*Yoshifumi WAKIYAMA¹, Yuichi ONDA¹, Kazuya YOSHIMURA², Hiroaki KATO¹ (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.Headquaters of Fukushima Partnership Operations, IAEA)

*Keisuke TANIGUCHI¹, Kazuya YOSHIMURA², Hugh SMITH³, Will BLAKE⁴, Yoshio TAKAHASHI⁵, Aya SAKAGUCHI⁵, Masayoshi YAMAMOTO⁶, Yuichi ONDA¹ (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.JAEA, 3.University of Liverpool, 4.School of Geography, Earth and Environmental Sciences, Plymouth University, 5.Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, 6.Low Level Radioactivity Laboratory, Kanazawa University)