Japan Geoscience Union Meeting 2014

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Oral

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

[M-AG38_2PM2] Dynamics of radionuclides emitted from Fukuchima Dai-ichi Nuclear Power Plant in the environment

Fri. May 2, 2014 4:15 PM - 5:00 PM 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:Motoyoshi Ikeda(Hokkaido University)

4:45 PM - 5:00 PM

[MAG38-P07_PG] Correlation between Atmospheric Re-entrainment of Radioactive Cs and Meteorological Phenomena Conditions.

3-min talk in an oral session

*Himiko KINO1, Kazuyuki KITA1, Misako TANAKA1, Takeshi KINASE1, Hiroyuki DEMIZU1, Yasuhito IGARASHI2, Masao MIKAMI2, Mizuo KAJINO2, Kouji ADACHI2, Toru KIMURA2, Masahide ISHIZUKA3, Hiroto KAWASHIMA4, Naohiro YOSHIDA5, Sakae TOYODA5, Keita YAMADA5, Hiroshi OKOCHI6, Atsushi SHINOHARA7, Kazuhiko NINOMIYA7, Yuichi ONDA8 (1.Ibaraki University, 2.Meteorological Research Institute, 3.Kagawa University, 4.Akita Prefectural University, 5.Tokyo Institute of Technology, 6.Waseda University, 7.Osaka University, 8.Tsukuba University)

Keywords:Radioactive Cs, Atmospheric Re-entrainment, Fukushima Daiichi Nuclear Plant accident, Environmental Radioactivity

1.IntroductionMassive earthquake attacked the eastern Japan on March 11 2011. It triggered the Fukushima Daiichi Nuclear Power Point accident, where large amount of radioactive substances were released. Released radioactive substances are diffused with atmospheric diffusion process, and eventually deposit on the ground surface and vegetation. Deposited radioactive Cs are released again from the ground surface and vegetation. Today's main factor of atmospheric radiation concentration fluctuation is atmospheric Re-entrainment of radioactive Cs. Re-entrainment mechanism of radioactive Cs is a complex and unprecedented problem. We must consider an interdisciplinary study on deposited radioactive Cs for long-term estimation. We infer that so Cs has a property that is taken in by clay minerals in soil that one of carriers of radioactive Cs is soil particles. The purpose of this study is to make clear how long does atmospheric radiation concentration increase by its re-entrainment, under what meteorological phenomena conditions.2.About sampling Since December 2012, we have been observing atmospheric radiation concentration of radioactive Cs by High-Volume Air Sampler on ground at Namie high school. It collects aerosols by passing through quartz filter. Wind velocity is measured at three altitudes by Three Cup Anemometer..Soil moisture is measured by Moisture Meter of Time Domain reflectometry system.3.Correlation between seasonal re-entrainment of radioactive Cs and meteorological phenomena conditions 4.Investigation of direct transport by back-trajectory analysis