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Variety of natural organic matters in deep underground and their impacts on radionuclide migration

Research Project

Project/Area Number 18H01912
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Saito Takumi  東京大学, 大学院工学系研究科(工学部), 准教授 (90436543)

Co-Investigator(Kenkyū-buntansha) 渡辺 勇輔  国立研究開発法人日本原子力研究開発機構, 核燃料・バックエンド研究開発部門 東濃地科学センター, 研究職 (30808647)
宮川 和也  国立研究開発法人日本原子力研究開発機構, 核燃料・バックエンド研究開発部門 幌延深地層研究センター, 研究副主幹 (90721225)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Keywords天然有機物 / 深部地下 / 核種移行 / 蛍光 / 多変量解析 / 深部地下環境 / PARAFAC
Outline of Final Research Achievements

Groundwater contains various natural organic matters with different properties, reflecting its genesis. In this research we investigated their properties and classified them, using the emission-excitation matrix (EEM) measurement and parallel factor analysis, a robust and powerful multivariate analysis for multi-dimensional data. The EEM of a large number of groundwater samples collected at the different geology, namely granitic and sedimentary groundwaters, were measured. The resulting data sets were processed by PARAFAC to extract common fluorescent components, which were compared with those in the existing database. We successfully classified the origin of the different NOM types in the two types of the groundwaters. In addition, we also measured EEM of the sedimentary groundwaters samples after adding Eu3+ as an analogue of radionuclides important for the safety assessment . Further PARAFAC analysis revealed the reactivity of the different NOM components against Eu3+.

Academic Significance and Societal Importance of the Research Achievements

天然有機物(NOM)は金属イオンと反応し,その移行性や反応性を変えることで,環境動態に大きな影響を及ぼすることが知られている.この点は,放射性廃棄物の処分において,NOMが廃棄体から溶出した核種の環境中での移行に影響を与えることを示唆し,NOMが処分の安全評価上重要な役割を担うことになる.表層の環境のNOMと金属イオンの反応は先行研究によって調べられ,幅広い環境条件に適用可能は熱力学モデルも提案されている.本研究の成果は,深部地下水中のNOMを分類し,その起源や核種との反応性を明らかにすることで,そのような熱力学モデルの深部地下NOMへの適用性の検証と新たなモデル開発に繋がるものである.

Report

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

    (3 results)

All 2021 2020

All Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] 蛍光分光測定と多変量解析を用いた深部地下水天然有機物と金属イオンの相互作用評価2021

    • Author(s)
      西 柊作,斉藤拓巳
    • Organizer
      日本原子力学会2021年春の年会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Hierarchical aggregation structures of humic acid by small-angle X-ray and neutron scattering2021

    • Author(s)
      Takumi Saito, Ryuhei Motokawa, Takayuki Kumada
    • Organizer
      Interface Against Pollution 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 蛍光分光測定と多変量解析を用いた深部地下水中の天然有機物の分類2020

    • Author(s)
      西柊作,斉藤拓巳,渡辺勇輔,宮川和也
    • Organizer
      日本原子力学会2020年春の年会
    • Related Report
      2019 Annual Research Report

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

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