*Chikako Fujimoto¹, Hiroyuki Kagi¹, Koichi Mimura², Tamihito Nishida², Ayako Shinozaki³, Hirotada Gotou⁴, Kazuki Komatsu¹, Shuya Takahashi¹ (1.Geochemical Laboratory, Graduate School of Science, University of Tokyo, 2.Graduate School of Environmental Studies, Nagoya University, 3.Faculty of Science, Hokkaido University, 4.Institute for Solid State Physics, University of Tokyo)

*Chikako Fujimoto¹, Hiroyuki Kagi¹, Koichi Mimura², Tamihito Nishida², Ayako Shinozaki³, Hirotada Gotou⁴, Kazuki Komatsu¹, Shuya Takahashi¹ (1.Geochemical Laboratory, Graduate School of Science, University of Tokyo, 2.Graduate School of Environmental Studies, Nagoya University, 3.Faculty of Science, Hokkaido University, 4.Institute for Solid State Physics, University of Tokyo)