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Measurement of amount of nuclear material by using combination of neutron and gamma-ray noise analysis

Research Project

Project/Area Number 17H03520
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionKyoto University

Principal Investigator

Tsuyoshi Misawa  京都大学, 複合原子力科学研究所, 教授 (70219616)

Co-Investigator(Kenkyū-buntansha) 高橋 佳之  京都大学, 複合原子力科学研究所, 助教 (40579273)
北村 康則  京都大学, 複合原子力科学研究所, 准教授 (60332706)
志賀 大史  京都大学, 複合原子力科学研究所, 助教 (70650836)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Keywords核物質 / 中性子雑音 / ガンマ線雑音 / 臨界実験 / 未臨界実験 / パイルアップ / 中性子 / ガンマ線 / 雑音測定 / 雑音解析 / 原子力 / 放射線 / 未臨界
Outline of Final Research Achievements

For nuclear security purpose, it is necessary to detect nuclear material such as enriched uranium and to determine its weight. We proposed new experimental method to measure neutron and gamma-ray noise simultaneously. Through critical and subcritical experiments, it was found that the gamma-ray noise analysis method is effective to decrease detector position dependency for evaluation of subcriticality which is related to nuclear material weight. For precise measurement, one of problems is the pile-up effect of signal caused by high background noise especially in gamma-ray noise analysis, and we developed new analysis method by measuring and storing all precise signal shape from detector and to evaluate each shape to eliminate signal pile up. Including other improvement of experimental techniques, we found that neutron and gamma-ray simultaneous noise analysis method is effective for detecting nuclear material and evaluation of its weight.

Academic Significance and Societal Importance of the Research Achievements

近年の世界情勢の様々な問題の中で核テロを未然に防ぐことは非常に重要であり、そのためにはスーツケース等に違法に隠匿された核爆弾の原料となり得る高濃縮ウラン等の核物質を探知する必要がある。本研究においては別途開発をしている小型中性子加速器の利用を念頭に置き、そこから中性子をスーツケース等に照射し、周囲に設置した検出器により中性子とガンマ線を同時に測定する混合雑音解析法を新たに提案した。これまでの実験で本手法測定手法が核物質の検知に有効であることを確認することができた。この小型な装置を空港などに設置する検査装置として実用化することができれば、核セキュリティー対策に大いに役立てることができる。

Report

(4 results)
  • 2021 Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (8 results)

All 2021 2020 2019 2018 Other

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

  • [Int'l Joint Research] ブダペスト工科大学(ハンガリー)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Delayed neutron effect in time-domain fluctuation analyses of neutron detector current signals.2019

    • Author(s)
      Y. Kitamura, T. Misawa
    • Journal Title

      Ann. Nucl. Energy

      Volume: 123 Pages: 119-134

    • DOI

      10.1016/j.anucene.2018.09.004

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Determination of prompt neutron decay constant by time-domain fluctuation analyses of detector current signals.2018

    • Author(s)
      Y. Kitamura, I. Pazsit, T. Misawa
    • Journal Title

      Ann. Nucl. Energy

      Volume: 120 Pages: 691-706

    • DOI

      10.1016/j.anucene.2018.06.021

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 燃料デブリの臨界管理技術の開発(52)KUCAでの不均一炉心体系を模擬した未臨界度測定試験2021

    • Author(s)
      和田怜志,加納慎也,矢澤博之,三澤毅,北村康則
    • Organizer
      日本原子力学会 2021年秋の大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 未臨界度測定に用いる放射線耐性の高い小型信号伝送システムの開発2020

    • Author(s)
      高橋佳之,三澤毅,北村康則,堀順一,安井彬
    • Organizer
      日本原子力学会 2020年秋の大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Subcriticality measurement by two-point approximation of Feynman-alpha method at a loosely coupled core to simulate widely spread fuel debris2019

    • Author(s)
      Tsuyoshi Misawa, Yasunori Kitamura and Yamato Hayashi
    • Organizer
      International Topical Workshop on Fukushima Decommissioning Research, FDR2019
    • Related Report
      2019 Annual Research Report
  • [Presentation] 燃料デブリの臨界管理技術の開発(43)ファインマンα法と中性子源増倍法を組み合わせた臨界近接監視手法の成立性の検討2018

    • Author(s)
      加納慎也, 和田怜志, 三澤毅, 北村康則
    • Organizer
      日本原子力学会「秋の大会」
    • Related Report
      2017 Annual Research Report
  • [Presentation] Development of portable SNMs detection system with D-D neutron source based on combination of noise analysis and threshold energy neutron analysis method2018

    • Author(s)
      T. Misawa, Y. Kitamura
    • Organizer
      IEEE 2018 Nuclear Science Symposium and Medical Imaging Conference, 10-17 Nov, 2018, Sydney, Australia.
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2023-01-30  

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