Investigation of Physical and Chemical Characteristics of Radioactive Aerosols Emitted From Reactor Unit 1 by Fukushima Daiichi Nuclear Power Plant Accident

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  • ONOZAKI Seika
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • ABE Yoshinari
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • NAKAI Izumi
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • ADACHI Kouji
    Meteorological Research Institute
  • IGARASHI Yasuhito
    Institute for Integrated Radiation and Nuclear Science, Kyoto University College of Science, Ibaraki University
  • OURA Yasuji
    Graduate School of Science, Tokyo Metropolitan University
  • EBIHARA Mitsuru
    Graduate School of Science, Tokyo Metropolitan University Department of Earth Sciences, School of Education and Integrated Arts & Sciences, Waseda University
  • MIYASAKA Takafumi
    Meteorological Research Institute Research Center for Advanced Science and Technology, The University of Tokyo Japan Meteorological Business Support Center
  • NAKAMURA Hisashi
    Research Center for Advanced Science and Technology, The University of Tokyo
  • SUEKI Keisuke
    Faculty of Pure and Applied Sciences, University of Tsukuba
  • TSURUTA Haruo
    Remote Sensing Technology Center of Japan
  • MORIGUCHI Yuichi
    School of Engineering, The University of Tokyo

Bibliographic Information

Other Title
  • 福島第一原子力発電所事故により1号機から放出された放射性エアロゾルの物理・化学的性状の解明
  • アナリティカルレポート 福島第一原子力発電所事故により1号機から放出された放射性エアロゾルの物理・化学的性状の解明
  • アナリティカルレポート フクシマ ダイイチ ゲンシリョク ハツデンショ ジコ ニ ヨリ 1ゴウキ カラ ホウシュツ サレタ ホウシャセイ エアロゾル ノ ブツリ ・ カガクテキ セイジョウ ノ カイメイ

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Abstract

<p>Three radioactive microparticles were separated from particles on filter tape samples collected hourly at a suspended particulate matter (SPM) monitoring site located at ∼25 km north of the Fukushima Daiichi Nuclear Power Plant (FDNPP), after the hydrogen explosion of reactor 1 on 12th March 2011. The 134Cs/137Cs radioactivity ratios of the three radioactive aerosol particles showed that they were derived from the FDNPP reactor 1, rather than reactors 2 or 3. The physical characteristics of these particles with < 10 μm in diameter and non-uniform shape are clearly different from those of radioactive particles generated by the hydrogen explosion of the FDNPP reactor 1. A significant amount of Cl was detected by energy dispaersive X-ray spectrometery. Synchrosron radiation microbeam (SR-μ-) X-ray fluoresence (XRF) analysis showed that these particles contain a series of heavy elements related to the nuclear fules and their fission products with a non-homogeneous distribution within the particles. In addition, the SR-μ-XRF identified trace amounts of Br in these particles; the element has firstly been found in radioactive particles derived by the FDNPP accident. In contrast to the hydrogen explosion-generated radioactive particles containing Sr and Ba, both of which are easily volatile under a reduction atmosphere, these elements were not rich in the particles found in this study. By the SR-μ-X-ray absorption near edge structure analysis and SR-μ-X-ray powder diffraction, it was found that these particles consist of an amorphous (or low crystalline) matrix containing metal elements with chemical states in a comparatively high state of oxidation or chloride. Based on these physical and chemical characteristics and a trajectory analysis of air parcels that passed over the SPM monitoring site, we concluded that these radioactive particles were generated and emitted into the atomosphere at the time of seawater injection for cooling the reactor after the hydrogen explosion.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 68 (10), 757-768, 2019-10-05

    The Japan Society for Analytical Chemistry

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