Radioactive ³⁵S emitted from the Fukushima Nuclear Power Plant and its re-suspension from the contaminated area

DOI Web Site Web Site 参考文献23件
  • Danielache Sebastian Oscar
    Dep. of Material and Life Sciences, Faculty of Sci. & Tech., Sophia University Earth and Life Sci. Inst., Tokyo Inst. of Tech.
  • Yoshikawa Chisato
    Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Kajino Mizuo
    Meteorological Research Institute, Japan Meteorological Agency Faculty of Life and Environmental Sciences, University of Tsukuba
  • Itou Satoshi
    Dep. of Material and Life Sciences, Faculty of Sci. & Tech., Sophia University
  • Kakeya Wataru
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology
  • Yoshida Naohiro
    Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology Earth-Life Science Institute, Tokyo Institute of Technology
  • Igarashi Yasuhito
    College of Science, Ibaraki University Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba

書誌事項

タイトル別名
  • Radioactive <sup>35</sup>S emitted from the Fukushima Nuclear Power Plant and its re-suspension from the contaminated area
公開日
2019
資源種別
journal article
DOI
  • 10.2343/geochemj.2.0542
公開者
一般社団法人日本地球化学会

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説明

<p>We present a numerical study conducted using a regional Lagrangian model to account for the transport, deposition and radioactive decay of 35S in sulfur dioxide and sulfate aerosols emitted into the atmosphere during the Fukushima Dai-ichi Nuclear Power Plant incident. The model is a Eulerian-Lagrangian hybrid system that accounts for chemical conversion of SO2 into SO42− in a Eulerian manner. The simulations were compared to field measurements of atmospheric 35S in sulfate collected at Kawamata, Tsukuba, Kashiwa, Fuchu and Yokohama, Japan. The 35S emission scenario that best replicated the field measurements followed the same temporal variation pattern as the 134/137Cs emissions. These results suggest that 35S and 134/137Cs follow a similar release pattern. Among the considered emission scenarios, a maximum flux of emitted chemical compounds was assumed to be either 100% 35SO42− or 100% 35SO2, with values of 4.0 × 1019 molecules/hour and 4.0 × 1020 molecules/hour, respectively on March 14th. These emission scenarios reflect the findings reported in the literature, where traces of 35SO2 were measured along with 35SO42−, so the actual emission is expected to be a combination of both chemical forms. The Kawamata measurements (Figs. 5 and 6) presented a large concentration in the July–August period, several months after emissions decreased by more than an order of magnitude. To explain this anomaly, re-suspension ratios were calculated for the Kawamata site, which ranged between 0.1 and 1.5% and partially, but not fully, explain the large measured concentrations. Furthermore, they show large discrepancies with 134/137Cs re-suspension values for measurements at the town of Namie. This situation indicates a lack of understanding of the transformations of 35S that occurs after deposition and the mechanisms involved in the 35S re-suspension process.</p>

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