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Transport paths of contaminants around the Japanese Archipelago from distributions of soluble radionuclides

Research Project

Project/Area Number 18K11615
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63010:Environmental dynamic analysis-related
Research InstitutionKanazawa University

Principal Investigator

Inoue Mutsuo  金沢大学, 環日本海域環境研究センター, 准教授 (60283090)

Co-Investigator(Kenkyū-buntansha) 長尾 誠也  金沢大学, 環日本海域環境研究センター, 教授 (20343014)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords放射性セシウム / ラジウム / ガンマ線計測 / 福島原子力発電所事故 / 物質循環 / 放射性核種 / ガンマ線測定 / 日本海
Outline of Final Research Achievements

Soluble radionuclides (Cs-134, Cs-137, Ra-226, and Ra-228) in seawater have been used as powerful tracers to investigate geochemical cycles in marine environments. By employing low-background gamma-spectrometry, we conduct fine-resolution observations of spatial variations of these radionuclides in the Sea of Japan, East China Sea, and Okhotsk Sea, and assess the circulation patterns of water masses. Particularly, FDNPP accident-derived Cs-134 explained circulation paths of soluble components around the Japanese Archipelago. Furthermore, the migration of Ra-228 readily explained the circulation patterns of Cs-134.

Academic Significance and Societal Importance of the Research Achievements

溶存放射性核種の分布から、日本列島近辺にもたらされる海水循環に関する情報を議論した。本海域における溶存成分循環の時間軸設定は、汚染問題を考えるうえで極めて重要であるにも関わらず、環境中に放出された時期・地域の明らかな放射性セシウムをトレースする以外の手法では困難である。これら放射性核種の空間分布の充実は、海水循環の解明のみならず、今後の有事の際の溶存汚染物質循環の対策にも有効である。さらに本研究で得られる日本列島を取り巻く海水のCs-134およびCs-137濃度の分布は、風評被害対策にも重要である。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (17 results)

All 2021 2020 2019 2018

All Journal Article (10 results) (of which Peer Reviewed: 10 results,  Open Access: 2 results) Presentation (5 results) Book (2 results)

  • [Journal Article] Kuroshio fractions in the southwestern Sea of Japan; implications from radium isotopes2021

    • Author(s)
      Inoue, M., Shirotani, Y., Morokado, T., Hanaki, S., Ito, M., Kameyama, H., Kofuji, H., Okino, A., Shikata, T., Yoshida, M., Nagao, S.
    • Journal Title

      Continental Shelf Research

      Volume: 214 Pages: 104328-104328

    • DOI

      10.1016/j.csr.2020.104328

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Circulation paths of 134Cs in seawater southwest of Japan in 2018 and 20192020

    • Author(s)
      Inoue, M., Takehara, R., Takikawa, T., Shirotani, Y., Morita, T., Honda, N., Nagao, S.
    • Journal Title

      Journal of Environmental Radioactivity

      Volume: 223-224 Pages: 106382-106382

    • DOI

      10.1016/j.jenvrad.2020.106382

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Distribution of radiocesium and radium isotopes in the western Bering Sea in 20182020

    • Author(s)
      Inoue, M., R. Takehara, S. Hanaki, H. Kameyama, J. Nishioka, S. Nago
    • Journal Title

      Marine Chemistry

      Volume: 225 Pages: 103843-103843

    • DOI

      10.1016/j.marchem.2020.103843

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Radiocesium in Japan Sea associated with sinking particles from Fukushima Dai-ichi Nuclear Power Plant accident2020

    • Author(s)
      Kaeriyama, H. Fujimoto, K., Inoue, M., Minakawa, M.
    • Journal Title

      Journal of Environmental Radioactivity

      Volume: 222 Pages: 106348-106348

    • DOI

      10.1016/j.jenvrad.2020.106348

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Suspended Particle-Water Interactions Increase Dissolved 137Cs Activities in the Nearshore Seawater during Typhoon Hagibis2020

    • Author(s)
      Takata, H., Aono, T., Aoyama, M., Inoue, M., Kaeriyama, H., Suzuki, S., Tsuruta, T., Wada, T., Wakiyama, Y.
    • Journal Title

      Environmental Science and Technology

      Volume: online Issue: 2 Pages: 615-630

    • DOI

      10.1007/s40710-020-00433-8

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Convection of surface water in the northeastern Japan Sea: Implications from vertical profiles of 134Cs concentrations.2019

    • Author(s)
      Inoue, M., Takehara, R., Yamashita, S., Senjyu, T., Morita, T., Miki, S., Nagao, S.
    • Journal Title

      Marine Chemistry

      Volume: 214 Pages: 103661-103661

    • DOI

      10.1016/j.marchem.2019.05.004

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Low levels of Fukushima Dai-ichi NPP-derived radiocesium in marine products from coastal areas in the Sea of Japan (2012-2017)2019

    • Author(s)
      Inoue, M., Yamashita, S., Takehara, R., Miki, S., Nagao, S.
    • Journal Title

      Applied Radiation and Isotopes

      Volume: 145 Pages: 187-192

    • DOI

      10.1016/j.apradiso.2018.12.029

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Preliminary investigation of 222Rn in the Yakumo Wind-hole, an algific talus deposits, from Izumo, southwest Honshu, Japan.2019

    • Author(s)
      Ritsuo Nomura, Mutsuo Inoue, Hisaki Kofuji
    • Journal Title

      Journal of Environmental Radioactivity

      Volume: 197 Pages: 109-115

    • DOI

      10.1016/j.jenvrad.2018.12.008

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Vertical profiles of Fukushima Dai-ichi NPP-derived radiocesium concentrations in the waters of the southwestern Okhotsk Sea (2011-2017)2018

    • Author(s)
      Inoue, M., Morokado, T., Fujimoto, K., Miki, S., Kofuji, H., Isoda, Y., Nagao, S.
    • Journal Title

      Journal of Environmental Radioactivity

      Volume: 192 Pages: 580-586

    • DOI

      10.1016/j.jenvrad.2018.04.021

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Radiocesium in the swash zones off the coast of the Japan Sea.2018

    • Author(s)
      Takata, H., Inoue, M., Shirotani, Y., Kudo, N.
    • Journal Title

      Applied Radiation and Isotopes

      Volume: 141 Pages: 64-69

    • DOI

      10.1016/j.apradiso.2018.08.012

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Ra-228/Ra-226比とCs-134濃度からみた日本海南西域表層の物質動態2020

    • Author(s)
      花木祥太朗、井上睦夫、竹原亮成、諸角季生、城谷勇陛、滝川哲太郎、吉田真明、沖野晃、三木志津帆、長尾誠也
    • Organizer
      日本放射化学会第64回討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 134Csの空間分布からみた北太平洋北西部における海水循環2020

    • Author(s)
      竹原亮成、井上睦夫、花木祥太朗、松中哲也、森田貴己、三木志津帆、黒田寛、谷内由貴子、葛西広海、長尾誠也
    • Organizer
      日本放射化学会第64回討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 234Th/238U比の空間分布からみた日本海の粒子除去2020

    • Author(s)
      亀山紘旭、井上睦夫、花木祥太朗、諸角季生、城谷勇陛、竹原亮成、森田貴己、三木志津帆、本多直人、長尾誠也
    • Organizer
      日本放射化学会第64回討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Cs-134の水平分布からみた北海道東部太平洋海域における海水循環2020

    • Author(s)
      竹原亮成、井上睦夫、松中哲也、長尾誠也、黒田寛、谷内由貴子、葛西広海、森田貴己、三木志津帆、西岡純
    • Organizer
      日本海洋学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Introduction of latest researches in Low Level Radioactivity Laboratory, Kanazawa University, Japan.2019

    • Author(s)
      Inoue, M.
    • Organizer
      1st Integrated Conference on Joint research Program in Mongolia (ICJPM)
    • Related Report
      2018 Research-status Report
  • [Book] ぶんせき2019

    • Author(s)
      井上 睦夫
    • Total Pages
      2
    • Publisher
      日本分析化学会
    • Related Report
      2019 Research-status Report
  • [Book] Trans-Boundary Pollution in North-East Asia2018

    • Author(s)
      M. Inoue
    • Total Pages
      18
    • Publisher
      Nova Science Publishers
    • ISBN
      9781536141634
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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