*Takahiro Watanabe¹, Yoko Kokubu¹, Hiroaki Murakami¹, Tatsunori Yokoyama¹, Hiroki Amamiya¹, Takashi Mizuno¹, Mitsuru Kubota¹, Teruki Iwatsuki¹ (1.Japan Atomic Energy Agency)

*Akio Goto¹, Noriyoshi Tsuchiya², Nobuo Hirano², Takahiro Watanabe², Tetsuya Matsunaka³, Miwa Kuri⁴, Masaoki Uno², Atsushi Okamoto², Kengo Nakamura², Sumiaki Machi¹ (1.Center for Northeast Asian Studies, Tohoku University, 2.Graduate School of Enviromental Studies, Tohoku University, 3.Tandem Accelerator Complex, University of Tsukuba, 4.International Research Institute of Disaster Sciences, Tohoku University)

*IJIN KANG¹, Kaoru Kashima¹, Koji Seto², Yukinori Tani³, Takahiro Watanabe⁴, Toshio Nakamura⁵, Genki I. Matsumoto⁶, Satoshi Imura⁷ (1.Department of Earth and Planetary Sciences, Graduate School of Sciences, Kyushu University, 2.Research Center for Coastal Lagoon Environments, Shimane University, 3.Institute of Environmental Sciences, University of Shizuoka, 4.Japan Atomic Energy Agency, 5.Center for Chronological Research, Nagoya University, 6.School of Social Information Studies, Otsuma Women’s University, 7.National Institute of Polar Research)