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)

10:15 AM - 10:30 AM

[MAG38-06] Evaluation of radioactivity resuspension by dust emission using a size-resolved 1-D vertical model in Namie, Fukushima

Masahide ISHIZUKA1, *Masao MIKAMI2, Yasuhito TANAKA2, Yasuhito IGARASHI2, Kazuyuki KITA3, Yutaka YAMADA4, Naohiro YOSHIDA5, Sakae TOYOTA5, Yukihiko SATO6, Yoshio TAKAHASHI7, Kazuhiko NINOMIYA8, Atsushi SHINOHARA8 (1.Kagawa University, 2.Meteorological Research Insitute, 3.Ibaraki University, 4.RIKEN, 5.Tokyo Institute of Technology, 6.Tsukuba University, 7.Hiroshima University, 8.Osaka University)

Keywords:Secondary emission, Radioactive aerosol, Dust, Fukusihma accident

Radioactive materials released into the atmosphere by the Fukushima Daiichi Nuclear Power Plant Accident in March 2011 were deposited over a wider area. Those materials adhered to the soil particles (dust particles) and its resuspension by strong winds is apprehensive about as secondary emissions. We have proposed a size-resolved, one-dimensional resuspension scheme to calculate the concentration of radioactivity in the atmosphere, in the last annual meeting. The results underscore the importance of taking into account soil texture when calculating the concentrations of resuspended, size-resolved atmospheric radioactivity. However, various assumptions were incorporated into both the scheme and evaluation conditions. In this study, we made analyses of soil particle size distribution and soil radioactivity at a school ground in Tsushima District, Namie Town, Fukushima, which was heavily polluted by the accident. The model results were compared with in situ observational data of the size spectrum of atmospheric radioactivity. We validated the applicability of the scheme and the behavior of resuspended radioactive aerosols.