Japan Geoscience Union Meeting 2016

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Oral

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

[M-AG24] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Mon. May 23, 2016 10:45 AM - 12:15 PM A03 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Kazuyuki Kita(Faculty of Science, Ibaraki University), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Teruyuki Nakajima(Japan Aerospace Exploration Agency), Yasuhito Igarashi(Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute), Masatoshi Yamada(Institute of Radiation Emergency Medicine, Hirosaki University), Chisato Takenaka(Graduate School of Bioagricultural Sciences, Nagoya University), masayoshi yamamoto(Low Level Radioactivity Laboratory, Kanazawa University), Jota Kanda(Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology), Atsushi Shinohara(Osaka university), Chair:Yuko Hatano(Graduate School of Systems and Information Engineering, University of Tsukuba)

10:45 AM - 11:00 AM

[MAG24-07] The situation of radioactive contamination in crops after five years of FDNPP accident

*Takuro Shinano1, Takeshi Ota1, Tomoko Uchida1, Katashi Kubo1, Hisaya Matsunami1, Tetsuya Eguchi1, Shigeto Fujimura1, Toshifumi Murakami1, Yoshihiko Takahashi1 (1.National Agriculture and Food Research Organization, Tohoku Agricultural Research Center, Agricultural Radiation Research Center)

Keywords:Radioactive cesium, Decontamination of radioactive cesium, Potassium

Tokyo electric power company’s Fukushima Daiichi Nuclear Power plant (FDNPP) accident affected a large area of Eastern Japan by the fallout of radioactive cesium. In 2011, more than 8000 ha of agricultural field was restricted planting and the area decreased about 2000 ha by the end of 2014. Two major protocols have been applied to the agricultural field, one is decontamination of field mainly by surface stripping method but it results a huge amount of radioactive waste of soil and biomass (more than 2,000, 000 m3). The other method is applying sufficient amount of potassium to the soil before conventional fertilization. The problem is that it is not able to decide the termination of applying excess amount of potassium to the field. Furthermore, as some plant species seems to have higher transfer factor, it makes the radioactive cesium content of the harvest higher than the standard limit in food (100 Bq/kg from April 2012, in Japan). Several countermeasures have been tried to encounter these problems. In the presentation, present situation of Fukushima area which have been affected by radioactive materials and how the agriculture has been reconstructed after the FDNPP accident.