*Yuichi Kurihara¹, Hikaru Miura¹, Toshihiro Kogure¹, Noriko Yamaguchi², Shogo Higaki³, Aya Sakaguchi⁴, Yuichi Onda⁵, Masayoshi Yamamoto⁶, Kazuya Tanaka⁷, Jota Kanda⁸, Takashi Ishimaru⁸, Yoshio Takahashi¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The university of Tokyo, 2.National Institute for Agro-Environmental Sciences, 3.Radioisotope Center, The university of Tokyo, 4.Faculty of Pure and Applied Science, University of Tsukuba, 5.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 6.Low Level Radioactivity Laboratory, Kanazawa University, 7.Japan Atomic Energy Agency, 8.Tokyo University of Marine Science and Technology)

*Toshiro Yamaguchi¹, Yuichi Onda¹, Hiroaki Kato¹ (1.Center for Research Isotopes and Environmental Dynamics, University of Tsukuba)

*Sho Iwagami¹, Maki Tsujimura², Yuichi Onda¹, Koichi Sakakibara², Yutaro Sato², Kosuke Nagano² (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.Graduate School of Life and Environmental Sciences, University of Tsukuba)

*XIANG GAO¹, Yuichi Onda², Keisuke Taniguchi³ (1.Master's Program in Environmental Sciences,University of Tsukuba , 2.Center for Research on Isotopes and Environmental Dynamics,University of Tsukuba, 3.Centre for Environmental Creation Fukushima Prefecture)

Takuya Nishioka¹, *Kazuyuki Kita¹, Naho Hayashi¹, Takeru Sato¹, Yasuhito Igarashi², Kouji Adachi², Yuji Zaizen², Sakae Toyoda³, Keita Yamada³, Naohiro Yoshida³, Teruya Maki⁴, Masahide Ishizuka⁵, Kazuhiko Ninomiya⁶, Atsushi Shinohara⁶, Hiroshi Okochi⁷, Yoshinari Abe⁸, Izumi Nakai⁸, hiroto kawashima⁹, Jun Furukawa¹⁰, Yuko Hatano¹⁰, Yuichi Onda¹⁰ (1.Faculty of Science, Ibaraki University, 2.Meterorology Research Institute, 3.Tokyo Institute of Technology, 4.Kanazawa University, 5.Kagawa University, 6.Osaka University, 7.Waseda University, 8.Tokyo University of Science, 9.Akita Prefectural University, 10.Tsukuba University)

*Hiroaki Kato¹, Yuichi Onda¹, Zul Hilmi Saidin¹, Toshiro Yamaguchi¹ (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba)

*Yoshifumi Wakiyama¹, Yuichi Onda^1,2 (1.Institute of Environmental Radioacitivity, Fukushima Universiy, 2.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba)

*Yuichi Onda¹, Keisuke Taniguchi², Yoshifumi Wakiyama³ (1.Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba, 2.Fukushima Prefectural Centre for Environmental Creation, 3.Institute of Environmental Radioactivity, Fukushima University)

*Hikaru Miura¹, Yuichi Kurihara¹, Keisuke Taniguchi², Aya Sakaguchi³, Shogo Higaki⁴, Yuichi Onda³, Yoshio Takahashi¹ (1.Department of science, Graduate school of The university of Tokyo , 2.Center for Environmental Creation Fukushima Prefecture, 3.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 4.Isotope science center, The university of Tokyo)

*Yuichi Kurihara¹, Hikaru Miura¹, Toshihiro Kogure¹, Noriko Yamaguchi², Shogo Higaki³, Aya Sakaguchi⁴, Yuichi Onda⁵, Masayoshi Yamamoto⁶, Kazuya Tanaka⁷, Jota Kanda⁸, Takashi Ishimaru⁸, Yoshio Takahashi¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The university of Tokyo, 2.National Institute for Agro-Environmental Sciences, 3.Radioisotope Center, The university of Tokyo, 4.Faculty of Pure and Applied Science, University of Tsukuba, 5.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 6.Low Level Radioactivity Laboratory, Kanazawa University, 7.Japan Atomic Energy Agency, 8.Tokyo University of Marine Science and Technology)

*Toshiro Yamaguchi¹, Yuichi Onda¹, Hiroaki Kato¹ (1.Center for Research Isotopes and Environmental Dynamics, University of Tsukuba)

*Sho Iwagami¹, Maki Tsujimura², Yuichi Onda¹, Koichi Sakakibara², Yutaro Sato², Kosuke Nagano² (1.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 2.Graduate School of Life and Environmental Sciences, University of Tsukuba)

*XIANG GAO¹, Yuichi Onda², Keisuke Taniguchi³ (1.Master's Program in Environmental Sciences,University of Tsukuba , 2.Center for Research on Isotopes and Environmental Dynamics,University of Tsukuba, 3.Centre for Environmental Creation Fukushima Prefecture)