Analysis of two forms of radioactive particles emitted during the early stages of the Fukushima Dai-ichi Nuclear Power Station accident

  • Satou Yukihiko
    Graduate School of Pure and Applied Sciences, University of Tsukuba
  • Sueki Keisuke
    Graduate School of Pure and Applied Sciences, University of Tsukuba
  • Sasa Kimikazu
    Graduate School of Pure and Applied Sciences, University of Tsukuba
  • Yoshikawa Hideki
    Fukushima Environmental Safety Center, Japan Atomic Energy Agency
  • Nakama Shigeo
    Fukushima Environmental Safety Center, Japan Atomic Energy Agency
  • Minowa Haruka
    Radioisotope Research Facility, Jikei University School of Medicine
  • 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
  • Ono Takahiro
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • Adachi Kouji
    Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute
  • Igarashi Yasuhito
    Atmospheric Environment and Applied Meteorology Research Department, Meteorological Research Institute

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<p>Two types of radioactive particles were isolated from environmental samples collected at various distances from the Fukushima Dai-ichi Nuclear Power Station. “Type A” particles are 2–10 μm in diameter and display characteristic Cs X-ray emissions when analyzed using energy-dispersive X-ray spectrometry (EDS). “Type B” particles are considerably larger, up to 400 μm in diameter, with Cs concentrations too low to be detectable with EDS. These larger particles were isolated from the region north of the nuclear reactor site, which was contaminated on March 12, 2011. The specific activity of Type B particles is much lower than Type A, and the mean 134Cs/137Cs ratios are ~0.93 and 1.04, respectively. The Type B ratio indicates that power station Unit 1 is the source, implying that these larger radioactive particles were discharged on March 12. This study found that different type of radioactive particles were released not only on March 15 but also on March 12.</p>

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