*Matsushita Koki¹, Yasunori Igarashi², Yuichi Onda¹, Yoshifumi Wakiyama², Alexei Konoplev², Gennady Laptev³, Sergii Obrizan⁴, Volodymyr Demianovych⁴, Mark Zheleznyak² (1.Tsukuba University, 2.Institute of Environmental Radioactivity at Fukushima University, 3.Ukrainian Hydrometeorological Institute, 4.Chernobyl Ecocentre, State Agency of Ukraine on Exclusion Zone Management)

*fumiaki makino¹, Yuichi Onda³, Keisuke Taniguchi², Mitbaa Slim⁴, Yoshifumi Wakiyama⁵, Hiroaki Kato³ (1.university of Tsukuba, 2.Center for Environmental Creation Fukushima Prefecture, 3.Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba, 4.Forest Research and Managment Organization, 5.Isotope of Environmental Radioacitivity, Fukushima Univesity)

*Olivier Evrard¹, Roxanne Durand¹, Seiji Hayashi², Hideki Tsuji², Yoshifumi Wakiyama³, Yuichi Onda⁴, Irène Lefèvre¹, Atsushi Nakao⁵, J. Patrick Laceby⁶ (1.Laboratoire des Sciences du Climat et de l'Environnement (LSCE, joint laboratory CEA-CNRS-UVSQ), University Paris-Saclay, France, 2.National Institute of Environmental Studies (NIES), Fukushima Branch, Japan, 3.Institute of Environmental Radioactivity (IER), Fukushima University, Japan, 4.Center for Research in Isotopes and Environmental Dynamics (CRIED), University of Tsukuba, Japan, 5.Graduate School of Life and Environmental Sciences, Kyoto Prefectural University (KUP), Japan, 6.Environmental Monitoring and Science Division (EMSD), Alberta Environment and Parks (AEP), Calgary, Alberta, Canada)

*Yoshifumi Wakiyama¹, Alexei Konoplev¹, Valentin Golosov², Maxim Ivanov², Mikhail Komissarov³ (1.Institute of Environmental Radioacitivity, Fukushima Universiy, 2.Faculty of Geography, M.V. Lomonosov Moscow State University, 3.Ufa Institute of Biology UFRC, Russian Academy of Science)