• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Challenges to measuring ultra-trace anthropogenic U-233 in the environment

Research Project

Project/Area Number 18K19849
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 63:Environmental analyses and evaluation and related fields
Research InstitutionUniversity of Tsukuba

Principal Investigator

SAKAGUCHI Aya  筑波大学, 数理物質系, 准教授 (00526254)

Co-Investigator(Kenkyū-buntansha) 山崎 信哉  筑波大学, 数理物質系, 助教 (70610301)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsウラン同位体 / 加速器質量分析 / 物質循環 / 人工放射性核種 / 環境動態 / 極微量放射性核種 / 人工ウラン同位体 / 海水 / 極微量核種測定 / ウラン吸着剤 / ウラン / トレーサー / 極微量核種分析 / 質量分析 / 海洋循環
Outline of Final Research Achievements

Although U-233 was expected to have been released into the environment as a result of human nuclear activities, its measurement has been difficult because the amount/concentrations of this nuclide in the environmental samples are tremendously small. In this study, efforts have been made to establish a method for analysing U-233 together with other uranium isotopes in the environment as simply as possible, by investigating chemical separation methods for environmental samples and improving the sensitivity of accelerator mass spectrometry. As a result, U-233 and other uranium isotopes were successfully measured in samples of a few grams in corals and oceanic sediments and a few litres in surface seawater. This has made it possible for the first time to determine when and how much U-233 was supplied to the Earth's surface environment. The results have been presented at conferences and in journal papers and are expected to be applied in many fields.

Academic Significance and Societal Importance of the Research Achievements

環境中の人工放射性ウランは、放射線防護や放射能による環境影響評価において重要なだけではなく、その物理化学的性質から環境動態を明らかにするツールとして有用である。そのため、本研究により環境中の極微量U-233の測定が実現したことは、物理や化学の基礎科学的な分野から動植物含めた環境評価や地球科学分野への応用、また今後ますます重要となる核鑑識や保証措置技術への貢献など様々な分野への波及効果は大きい。特に環境中には極微量のウラン同位体U-236も存在していることから、これらU同位体の濃度とともに、U-233/U-236比を利用することによる応用研究のポテンシャルは計り知れない。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (14 results)

All 2022 2021 2020 Other

All Int'l Joint Research (5 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (4 results)

  • [Int'l Joint Research] ウィーン大学(オーストリア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ドレスデン・ロッセンドルフ研究所/カールスルーエ研究所(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Univ. of Vienna(オーストリア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Technical University of Denmark(デンマーク)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Developing Accelerator Mass Spectrometry Capabilities for Anthropogenic Radionuclide Analysis to Extend the Set of Oceanographic Tracers2022

    • Author(s)
      Hain Karin, Martschini Martin, Gulce Fadime, Honda Maki, Lachner Johannes, Kern Michael, Pitters Johanna, Quinto Francesca, Sakaguchi Aya, Steier Peter, Wiederin Andreas, Wieser Alexander, Yokoyama Akihiko, Golser Robin,
    • Journal Title

      Frontiers in Marine Science

      Volume: 9 Pages: 1-17

    • DOI

      10.3389/fmars.2022.837515

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 233U/236U signature allows to distinguish environmental emissions of civil nuclear industry from weapons fallout2020

    • Author(s)
      K. Hain, P. Steier, M. B. Froehlich, R. Golser, X. Hou, J. Lachner, T.Nomura, J. Qiao, F. Quinto, A. Sakaguchi
    • Journal Title

      Nature Communications

      Volume: 11, 1275 Issue: 1 Pages: 1-11

    • DOI

      10.1038/s41467-020-15008-2

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 別府湾堆積物に存在する極微量放射性核種ウランの同位体の分析-人新世の時代区分定義への取り組み2022

    • Author(s)
      高橋 穂高; 坂口 綾; 高久雄一; 加三 千宣; Karin Hain; Andreas Wiederin; 山崎 信哉; 末木 啓介
    • Organizer
      第 23 回「環境放射能」研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 極微量人工放射性核種233Uと236Uの海洋循環デュアルトレーサー利用に向けた海水中U濃縮法の検討2021

    • Author(s)
      阿部美波,坂口綾,瀬古典明,保科宏行,山崎信哉,末木啓介
    • Organizer
      第22回環境放射能研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Accelerator mass spectrometry analyses of ultra-trace radionuclides in the environment - application to geoscience studies -2021

    • Author(s)
      Aya SAKAGUCHI
    • Organizer
      Forum for Nuclear Cooperation in Asia
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] TRIOS

    • URL

      https://trios.tsukuba.ac.jp/ja/researchers/0000003614

    • Related Report
      2021 Annual Research Report
  • [Remarks] 筑波大学研究者総覧(坂口綾)

    • URL

      https://trios.tsukuba.ac.jp/researcher/0000003614

    • Related Report
      2020 Research-status Report
  • [Remarks] ホームページ(坂口綾)

    • URL

      http://www.ied.tsukuba.ac.jp/~ayaskgc/index.html

    • Related Report
      2020 Research-status Report
  • [Remarks] 論文 坂口准教授の共著論文がNature Communicationsに掲載されました

    • URL

      http://www.ied.tsukuba.ac.jp/2020_sakaguchi_ronbun/

    • Related Report
      2019 Research-status Report

URL: 

Published: 2018-07-25   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi