*Michio Aoyama^1,2, Chikako Cheong³, Tsutomu Miura³, Takeshi Fujii⁴, Hitoshi Mitsuda⁴, Tomomi Sone⁵, Hiroshi Uchida¹, Akihiko Murata¹ (1.RIGC, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2.Faculty of Life and Environmental Sciences, University of Tsukuba, 3.National Institute of Advanced Industrial Science and Technology (AIST), National Metrological Institute of Japan (NMIJ), 4.Laboratory for Instrumentation and Analysis, KANSO CO., LTD. , 5.MARINE WORKS JAPAN LTD.)

*Daisuke Sasano¹, Michio Aoyama^2,3, Toshiya Nakano⁴, Naoki Nagai¹ (1.Japan Meteorological Agency, 2.University of Tsukuba, 3.JAMSTEC, 4.Nagasaki Meteorological Office)

*Michio Aoyama¹ (1.Center for Research in Isotopes and Environmental Dynamic, Faculty of Life and Environmental Sciences, University of Tsukuba)

*Michio Aoyama¹, Naoko Otani¹, Yuichi Onda¹ (1.Center for Research in Isotopes and Environmental Dynamic, Faculty of Life and Environmental Sciences, University of Tsukuba)

*Yutaka Tateda¹, Daisuke Tsumune¹, Takuya Tsumune¹, Takashi Ishimaru², Jota Kanda², Yukari Ito², Keiichi Uchida², Michio Aoyama³, Yasunori Hamajima⁴, Tatsuo Aono⁵, Yousuke Amano⁶, Shotaro Suzuki⁶ (1.Central Research Institute of Electric Power Industry, Environmental Science Research Laboratory, 2.Tokyo University of Marine Science and Technology, 3.University of Tsukuba, 4.Kanazawa University, 5.National Institute for Quantum and Radiological Science and Technology, 6.Fukushima Prefectural Fisheries and Marine Science Research Centre)

*Yuichiro Kumamoto¹, Michio Aoyama², Yasunori Hamajima³, Akihiko Murata¹ (1.Japan Agency for Marine-Earth Science and Technology, 2.Tsukuba University, 3.Kanazawa University)

*Daisuke Tsumune¹, Tsubono Takaki¹, Kazuhiro Misumi¹, Yutaka Tateda¹, Yuichi Onda², Michio Aoyama² (1.Central Research Institute of Electric Power Industry, 2.Center for Research in Isotopes and Environmental Dynamics)

*Yayoi Inomata¹, Michio Aoyama² (1.Kanazawa University, Institute of Nature and Environmental Technology, 2.Tsukuba University, Center for Research in isotopes and Environmental Dynamics)

*Tsubono Takaki¹, Kazuhiro Misumi¹, Daisuke Tsumune¹, Michio Aoyama², Katsumi Hirose³ (1.Central Research Institute of Electric Power Industry, 2.University of Tsukuba, 3.Sophia University)

*Hyoe Takata¹, Tatsuo Aono², Michio Aoyama³, Hideki Kaeriyama⁴, Mutsuo Inoue⁵ (1.Fukushima Univ., 2.QST, 3.Tsukuba Univ., 4.FRA, 5.Kanazawa Univ.)