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Development of effective and economical decontamination methods considering the mode of existence of radioactive Cs

Research Project

Project/Area Number 18K19867
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 64:Environmental conservation measure and related fields
Research InstitutionIbaraki University

Principal Investigator

Tanaka Ichiro  茨城大学, 理工学研究科(工学野), 教授 (20354889)

Co-Investigator(Kenkyū-buntansha) 新村 信雄  茨城大学, 理工学研究科(工学野), 特命研究員 (50004453)
菊地 賢司  茨城大学, 理工学研究科(工学野), 特命研究員 (70354769)
Project Period (FY) 2018-06-29 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Keywords汚染土壌中のCs存在様式 / Cs溶出実験 / 経済的除染 / 一価陽イオン溶出 / 粗い粉砕 / 土壌除染 / 荒い粉砕 / 熱処理 / 除染 / 土壌 / 熱安定性 / 一様な放射性Cs / 顆粒状放射性Cs / 放射性Cs / 福島第一原発事故 / 存在様式 / 高温安定 / 放射性Cs除染 / 経済的
Outline of Final Research Achievements

By visualizing the contaminated soil with an imaging plate, we found that the radioactivity concentration of uniformly existing radioactive Cs is relatively high, and that it is necessary to consider not only granular Cs but also uniformly existing radioactive Cs in decontamination soil. Therefore, we investigated the solubility in an aqueous solution containing monovalent cations similar to radioactive Cs in contaminated soil, and the elution after rough pulverization to simulate weathering. As a result, aqueous ammonium sulfate solution was found to be effective. Furthermore, in the elution experiments with varying concentrations of ammonium sulfate solution, the elution rate of radioactive Cs+ was found to be dependent on the concentration of the ammonium sulfate solution. And rough crushing of the soil also increased the elution of radioactive Cs+. It can be said that this also indicates the possibility of economical decontamination.

Academic Significance and Societal Importance of the Research Achievements

12年前の東日本大震災により東京電力福島第一原子力発電所事故が起こり、半減期が約30年と長い放射性Csが大量に拡散され、経済的な方法で速やかに取り除く必要がある。汚染土壌中の放射性Csのうち,放射能濃度が高いものは層状ケイ酸塩鉱物の層間に吸着されている存在様式であることを見出し,このような存在様式を意識した経済的な除染方法の開発を目的としていた。汚染土壌中の放射性Csの溶解性が高い一価陽イオンを含む水溶液では,硫安が最適であることを見出したほか,風化を模擬するような荒い粉砕後の溶出実験によって,風化によって放射性Csの溶解性が上昇することを示すとともに、経済的除染の可能性も示すことができた。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (22 results)

All 2023 2022 2021 2020 2019 2018 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (15 results) (of which Int'l Joint Research: 7 results) Remarks (2 results) Funded Workshop (1 results)

  • [Journal Article] 福島第一原発事故とチェルノブイリ原発事故後の農耕地における放射性セシウムの挙動に対する耕うんの影響比較2021

    • Author(s)
      Li Peiran、Gong Yingting、菊地 賢司、小松﨑 将一
    • Journal Title

      環境放射能除染学会誌

      Volume: 9 Pages: 117-130

    • NAID

      40022724177

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Field Research Report on Radioactive Cesium Contained in Persimmon Growing at Orchards of Fukushima Eight Years after the Nuclear Power Plant Accident2021

    • Author(s)
      Kenji Kikuchi
    • Journal Title

      Journal of Soil and Water Science

      Volume: 5 Issue: 2 Pages: 193-196

    • DOI

      10.36959/624/444

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 福島第一原発事故とチェルノブイリ後の農耕地における放射性セシウムの挙動に対する耕うん影響比較2021

    • Author(s)
      李 沛然、ゴン インティ、菊地 賢司、小松崎 將一
    • Journal Title

      環境放射能除染学会誌

      Volume: 9

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dissolution, Mechanical Properties, and Thermal Stability of Microparticles Containing Radioactive Cesium on Plant Litter Derived from the Fukushima Daiichi Nuclear Power Plant Accident2020

    • Author(s)
      Atsushi Yamaguchi, Kenji Kikuchi, Masakazu Komatsuzaki, Ichiro Tanaka and Nobuo Niimura
    • Journal Title

      Radiology and Medical Diagnostic Imaging

      Volume: 3 Pages: 1-8

    • DOI

      10.31487/j.rdi.2020.04.04

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 汚染土壌における経済的除染方法開発のための放射性Cs溶出条件の探索2023

    • Author(s)
      杉原誠,菊地賢司,新村信雄,田中伊知朗
    • Organizer
      2022年度量子ビームサイエンスフェスタ
    • Related Report
      2022 Annual Research Report
  • [Presentation] Visualization and dissolution behavior of Cs-contaminated soil for economical decontamination2022

    • Author(s)
      Makoto Sugihara, Nobuo Niimura, Kenji Kikuchi , Ichiro Tanaka
    • Organizer
      The 6th International Symposium of Quantum Beam Science at Ibaraki University
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 経済的除染方法開発のための汚染土壌からの 137Cs溶出条件の探索2022

    • Author(s)
      杉原誠 、菊地賢司 、新村信雄 、田中伊知朗
    • Organizer
      2021年度量子ビームサイエンスフェスタ
    • Related Report
      2021 Research-status Report
  • [Presentation] Dissolution, Mechanical Properties, and Thermal Stability of Microparticles Containing Radioactive Cesium on Plant Litter Derived from the Fukushima Daiichi Nuclear Power Plant Accident, and Soil Decontamination Trials2021

    • Author(s)
      Ichiro Tanaka, Atsushi Yamaguchi, Kenji Kikuchi , Nobuo Niimura , Yume Saeki, Makoto Sugihara
    • Organizer
      European Geosciences Union General Assembly 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 放射性Cs含有土壌の熱安定性と経済的除染方法の開発2021

    • Author(s)
      佐伯夢、山口淳史、菊地賢司、新村信雄、田中伊知朗
    • Organizer
      2020年度量子ビームサイエンスフェスタ
    • Related Report
      2020 Research-status Report
  • [Presentation] 放射性Csを含む土壌の空間分布可視化と熱安定性2021

    • Author(s)
      杉原誠、田中伊知朗
    • Organizer
      2020年度量子ビームサイエンスフェスタ
    • Related Report
      2020 Research-status Report
  • [Presentation] Dissolution, Mechanical Properties, and Thermal Stability of Microparticles Containing Radioactive Cesium on Plant Litter Derived from the Fukushima Daiichi Nuclear Power Plant Accident, and Soil Decontamination Trials2021

    • Author(s)
      Ichiro Tanaka, Atsushi Yamaguchi, Kenji Kikuchi, Nobuo Niimura, Yume Saeki, and Makoto Sugihara
    • Organizer
      EGU General Assembly 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] イメージングプレートによる植物内の物質移動の可視化観察2019

    • Author(s)
      阿部真理奈,松村邦仁、菊地賢司
    • Organizer
      日本原子力学会 春の年会ポスターセッション
    • Related Report
      2019 Research-status Report
  • [Presentation] イメージングプレートによる柿の放射線計測2019

    • Author(s)
      菊地賢司
    • Organizer
      第1回茨城大学福島原発由来放射性セシウム除染に向けた研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] 福島原発事故由来の顆粒状放射性Csはいかにして溶解するか?2019

    • Author(s)
      田中伊知朗
    • Organizer
      第1回茨城大学福島原発由来放射性セシウム除染に向けた研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] 福島第一原子力発電所事故由来の顆粒状放射性Csの可溶化について2019

    • Author(s)
      山口淳史、菊地賢司、佐伯夢、新村信雄、田中伊知朗
    • Organizer
      2018年度量子ビームサイエンスフェスタ
    • Related Report
      2018 Research-status Report
  • [Presentation] Scope of the research base in Ibaraki University on the radiocesium emitted from Fukushima Daiichi Nuclear Power Plant2019

    • Author(s)
      Ichiro Tanaka
    • Organizer
      Ibaraki University-Institut de Radioprotection et de Surete Nucleaire (IRSN)/Japan-UK EICHI-project joint international workshop on radioactive particles
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Physical properties, structure, shape, and solubility of granular Cs* from the FDNPP accident2019

    • Author(s)
      Nobuo Niimura
    • Organizer
      Ibaraki University-Institut de Radioprotection et de Surete Nucleaire (IRSN)/Japan-UK EICHI-project joint international workshop on radioactive particles
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] How does granular radioactive Cs derived from the Fukushima Daiichi Nuclear Power Plant accident become soluble?2018

    • Author(s)
      Atsushi Yamaguchi, Kenji Kikuchi, Masakazu Komatsuzaki, Ichiro Tanaka, Yume Saeki, Nobuo Niimura
    • Organizer
      14th International Workshop on Spallation Materials Technology(IWSMT-14)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Topics on Material Performance in LBE2018

    • Author(s)
      Kenji Kikuchi
    • Organizer
      14th International Workshop on Spallation Materials Technology(IWSMT-14)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] 茨城大学 福島原発由来放射性セシウム研究拠点

    • URL

      http://nsb.mat.ibaraki.ac.jp/pj/index.html

    • Related Report
      2021 Research-status Report
  • [Remarks] 茨城大学福島原発由来放射性セシウム研究拠点

    • URL

      http://nsb.mat.ibaraki.ac.jp/pj/index.html

    • Related Report
      2020 Research-status Report 2019 Research-status Report 2018 Research-status Report
  • [Funded Workshop] The 6th International Symposium of Quantum Beam Science at Ibaraki University2022

    • Related Report
      2021 Research-status Report

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Published: 2018-07-25   Modified: 2024-01-30  

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