JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-AG Applied Geosciences

[M-AG34] [EJ] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Thu. May 25, 2017 10:45 AM - 12:15 PM Convention Hall A (International Conference Hall 2F)

convener:Kazuyuki Kita(Faculty of Science, Ibaraki University), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Yasuhito Igarashi(Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute), Masatoshi Yamada(Institute of Radiation Emergency Medicine, Hirosaki University), Chairperson:Haruka Minowa(The Jikei University School of Medicine), Chairperson:Hiroaki Kato(Tsukuba University)

10:45 AM - 11:00 AM

[MAG34-07] Investigation of soil radionuclude near the Fukushima Dai-ichi Nuclear Power Plant 5-year after the accident by JpGU-JNRS team

*Kazuyuki Kita1, Atsushi Sinohara2, Kencho Kawatsu3, Kazuhiko Ninomiya2, Yuki Inai2, Haruka Minowa4, Tsutomu Ohtuki5, Yasushi Kino6, Kazuma Koarai6, Takashi Saito7, Yukihiko Sato8, Keisuke Sueki9, Koichi Takamiya5, Yukio Takeuchi10, Taeko Doi10, Yoshinari Abe11, Yasuhiro Iwamoto12, Masaki Uesugi13, Satoru Endou14, Hiroshi Okochi12, Naoya Katsumi12, Akimitsu Kanda2, Kenya Kubo15, Yuya Koike16, Akinori Sueoka12, Anna Suzuki2, Masatoshi Suzuki6, Kenji Suzuki3, Tsugiko Takase3, Masaomi Takahashi2, Zi Jian Zhang2, Izumi Nakai11, Seiya Nagao13, Akihiro Nanbu2, Fujita Nobuhumi2, Yuichi Moriguchi18, Akiyo Yatagai17, Akihiko Yokoyama13, Go Yoshida2, Takashi Yoshimura2, Akira Watanabe3 (1.Ibaraki University, 2.Osaka University, 3.Fukushima University, 4.The Jikei University School of Medercine, 5.Kyoto University, 6.Tohoku University, 7.Shokei Gakuin Daigaku, 8.Japan Atomic Energy Agency, 9.Tsukuba University, 10.National Institute of Environmental Studies, 11.Tokyo University of Science, 12.Waseda University, 13.Kanazawa University, 14.Hiroshima University, 15.International Christian University, 16.Meiji University, 17.Hirosaki University, 18.University of Tokyo)

Keywords:Fukushima Dai-ichi Nuclear Power Plant, Radiocesium, soil deposition density

[Introduction] A large-scale soil sampling project for radionuclides from the Fukushima Dai-ichi Nuclear Power Plant accident was conducted in June 2011 by a research group including the Japan Geoscience Union (JpGU) and the Japan Society of Nuclear and Radiochemical Sciences (JNRS). New research project following the 2011 project was also implemented by JpGU-JNRS team with the objective to know the transition process of radioactive cesium in soil and the current contamination in 2016 when five years passed since the accident.
In this report, the outline of the project will be presented. We will also present some preliminary results of the inventory of 134Cs and 137Cs in the soil, comparing 2011 and 2016. More detailed results wll be presented in another report.

[Sampling and Measurement] Between June and September 2016, 176 researcher of total had worked to measure the air dose rate and collect soil samples at 105 locations near the Fukushima Dai-ichi nuclear power plant, mainly on the difficult-to-return zone, for 9 days in total. Surface soil was sampled at 5 points per one location as well as air dose rate at 5 cm and 1 m from the ground surface. The sample from depths of 5 cm was divided into two parts of 0 - 2.5 cm depth and 2.5 - 5 cm depth, filled in a U-8 container after drying. Radiocesium was quantified using gamma ray spectrometry with Ge detectors. To understand the transion of radiocesium in soil, 30-cm depth soil core samples were obtained at about 1/4 of all locations.