Discovery of radiocesium-bearing microparticles in river water and their influence on the solid-water distribution coefficient (Kd) of radiocesium in the Kuchibuto River in Fukushima

DOI Web Site Web Site 被引用文献36件 参考文献34件 オープンアクセス
  • Miura Hikaru
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Kurihara Yuichi
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo
  • Sakaguchi Aya
    Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba
  • Tanaka Kazuya
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Yamaguchi Noriko
    Institute for Agro-Environmental Sciences, NARO
  • Higaki Shogo
    Isotope Science Center, The University of Tokyo
  • Takahashi Yoshio
    Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo

書誌事項

タイトル別名
  • Discovery of radiocesium-bearing microparticles in river water and their influence on the solid-water distribution coefficient (<i>K</i><sub>d</sub>) of radiocesium in the Kuchibuto River in Fukushima
  • Discovery of radiocesium-bearing microparticles in river water and their influence on the solid-water distribution coefficient (Kd) of radiocesium in the Kuchiboso River in Fukushima
公開日
2018
資源種別
journal article
DOI
  • 10.2343/geochemj.2.0517
公開者
一般社団法人日本地球化学会

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説明

<p>We found four radiocesium-bearing microparticles (CsMPs) with high cesium (Cs) radioactivity in suspended particles collected from the Kuchibuto River in Fukushima by filtering water during 2011–2016. The CsMPs were identified by autoradiography and subsequently were separated from other suspended particles by the “multiple wet separation method” using a NaI scintillation counter. The present four CsMPs contained 0.426–2.827 Bq of 137Cs and had a chemical composition similar to that of particles released during the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP). The activity ratio of Cs (134Cs/137Cs) suggests that they originated from Unit 2 or 3 of the FDNPP. The ratio of the radioactivity of the separated CsMPs to the total radiocesium on the filters ranged from 0 to 46%. Moreover, we calculated the radioactivities of CsMPs with lower radioactivity (0.1 to 0.4 Bq 137Cs) determined by autoradiography. When smaller CsMPs were included, the ratio of the radioactivity of the CsMPs to the total radioactivity of radiocesium on the filters ranged from 1.3 to 67%. It has been previously suggested that the solid-water distribution coefficient (Kd) of radiocesium in rivers is apparently increased due to the possible presence of CsMPs in the solid phase because the water solubility of radiocesium in CsMPs is small. However, this study reveals that higher Kd values in rivers in Fukushima compared with those in Chernobyl cannot be explained by the contribution of CsMPs alone. The temporal variation of the ratio of radioactivity of CsMPs to the total radioactivity of radiocesium in river water after the FDNPP accident is also discussed.</p>

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