Japan Geoscience Union Meeting 2014

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Oral

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

[M-AG38_2AM1] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Fri. May 2, 2014 9:00 AM - 10:45 AM 501 (5F)

Convener:*Kazuyuki Kita(Faculty of Science, Ibaraki University), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), Teruyuki Nakajima(Atmosphere and Ocean Research Institute), Yasuhito Igarashi(Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute), Jun Matsumoto(Deaprtment of Geography, Tokyo Metropolitan University), 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(Tokyo University of Marine Science and Technology), atsushi shinohara(Osaka university), Chair:Kazuyuki Kita(Faculty of Science, Ibaraki University)

10:30 AM - 10:45 AM

[MAG38-07] Simulation of I-131 in the atmosphere emitted from the Fukushima Daiichi Nuclear Power Plant

*Masayuki TAKIGAWA1, Haruo TSURUTA2 (1.JAMSTEC, 2.AORI, Univ. of Tokyo)

Keywords:numerical simulation, atmospheric environment

A large amount of radioactive materials was released into the atmosphere after the accident of the Fukushima Daiichi Nuclear Power Plant (FD1NPP). Inhalation of iodine 131 is important for internal exposure, but the observation of iodine is quite limited especialy in the early phase of the accident. We have conducted the simulation of radionuclides using a regional chemical transport model for March 2011. Calculated accumulated deposition of iodine 131 and caesium 137 was compared with the estimation using aircraft monitoring by MEXT and DOE (Torii et al., 2013). The model well captured the meridional gradient in the ratio of iodine 131 to caesium 137 around FD1NPP. The ratio of iodine 131 to caesium 137 is larger than 15 in the south of FD1NPP, and relatively small (around 0.7) in the northwest. This result implies that the regional model and the source term estimated by JAEA can generally reproduce eventual releases which cause large depositon ofer the land in March 2011.