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Development of micro Bonner Ball Detectors for measurement of neutron energy spectrum in epi-thermal region

Research Project

Project/Area Number 17K19088
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Nuclear engineering, Earth resources engineering, Energy engineering, and related fields
Research InstitutionNagoya University

Principal Investigator

Uritani Akira  名古屋大学, 工学研究科, 教授 (10213521)

Project Period (FY) 2017-06-30 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Keywords中性子 / 熱外中性子 / エネルギースペクトル / 共鳴 / ボナー球 / 液体減速材 / BNCT
Outline of Final Research Achievements

After evaluating the response function of the prototype detector by calculation, fabrication and characterization were performed. It was found that the detector can estimate the epithermal neutron spectrum. At the same time, it was found that there is a limit to the accuracy of the spectrum obtained by spectrum measurement using a finite number of Bonner balls. Therefore, we also examined a method of measuring the thermal neutron distribution moderated in a liquid moderator such as water with a neutron detector having high spatial resolution and obtaining an energy spectrum from the distribution shape. When we actually measured the BNCT epithermal neutron field, we could obtain an estimated spectrum that almost matches the neutron spectrum obtained by Monte Carlo calculation.

Academic Significance and Societal Importance of the Research Achievements

がんの放射線治療の一つにホウ素中性子捕捉療法(以下BNCT)がある。BNCTで照射する中性子は数 eV~数十 keVのエネルギーの熱外中性子である。患者への不要な被曝の低減や治療効果を担保するために熱外中性子のスペクトルの測定が必要である。現状行われている金属箔の放射化による方法では中性子をリアルタイムで測定する事ができず、ボナー球スペクトロメータでは熱外領域のスペクトルを測定する事が困難である。そのため、リアルタイムでの測定が可能であり熱外領域の中性子スペクトルを測定できる検出器の開発を行った。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (4 results)

All 2018 2017

All Presentation (3 results) Patent(Industrial Property Rights) (1 results)

  • [Presentation] 加速器BNCT用熱外中性子スペクトロメータの応答関数に関する検討2018

    • Author(s)
      須田 直樹、瓜谷 章、渡辺 賢一、吉橋 幸子、山崎 淳
    • Organizer
      日本原子力学会2018年秋の大会
    • Related Report
      2018 Research-status Report
  • [Presentation] BNCT用中性子スぺクトロメータ2017

    • Author(s)
      須田 直樹、瓜谷 章、渡辺 賢一、吉橋 幸子、山崎 淳
    • Organizer
      日本原子力学会「2017年秋の大会」
    • Related Report
      2017 Research-status Report
  • [Presentation] シンチレータを用いた光ファイバ型熱中性子検出器2017

    • Author(s)
      渡辺 賢一(研究協力者)
    • Organizer
      平成29年度放射線治療と放射線防護のための放射線計測に関する研究会
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] 中性子検出器及び中性子測定装置2017

    • Inventor(s)
      土田一輝,渡辺賢一,瓜谷章,須田直樹,佐藤和也,山﨑淳,吉橋幸子
    • Industrial Property Rights Holder
      土田一輝,渡辺賢一,瓜谷章,須田直樹,佐藤和也,山﨑淳,吉橋幸子
    • Industrial Property Rights Type
      特許
    • Filing Date
      2017
    • Related Report
      2018 Research-status Report

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Published: 2017-07-21   Modified: 2021-02-19  

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