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Method for simultaneous determination of ambient dose equivalent rate and activity concentration in air for environmental radiation monitoring

Research Project

Project/Area Number 16K06966
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Nuclear engineering
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

kowatari munehiko  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 放射線管理部, 主査 (80391283)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords放射線防護 / 環境放射線 / モニタリング / CeBr3検出器 / 保健物理 / 環境ガンマ線モニタリング / 環境放射能 / ガンマ線計測 / 総合工学 / 原子力学 / 保健物理・環境安全
Outline of Final Research Achievements

A method to simultaneously determine ambient dose equivalent rate and radioactivity concentration in air by using a newly developed scintillation spectrometer was investigated. The performance of the proposed method was verified by a series of measurements, conducted according to the procedure of inter-comparison by EURADOS. Results show that the proposed method is suitable for environmental monitoring purposes. The activity concentration in air was determined in the laboratory by using a point-like sealed 133Ba source. The photon fluence rate was obtained from the pulse height distribution by using the unfolding method, and the activity concentration in air for radioisotopes of interest, mainly 133Xe, was estimated from the obtained photon fluence rate by applying the conversion coefficient evaluated via a Monte Carlo calculation. The results additionally show that the method presented in this study is reliable and suitable for the environmental radiation measurement.

Academic Significance and Societal Importance of the Research Achievements

福島第一原子力発電所事故直後に発生した放射性希ガスの分布の正確な測定ができなかったが、本研究事業で開発した手法を用いることにより、原子力事故ごく初期に生じるイベントを適切に検知できるようになる。得られた測定結果を用いることにより、原子力事故時のソースターム推定をより精度よく行うことができるほか、測定により、住宅密集地、山林、耕作地等への放射性希ガス及び放射性ヨウ素の移行・沈着の挙動、という、微視的でローカルな拡散の挙動を適切にとらえることができる。原子力防災の観点から、本手法の導入により、公衆被ばくを過小評価せず、実測に基づいた避難指示等を適切に出せることが期待される。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017 Other

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

  • [Int'l Joint Research] Physikalisch-Technische Bundesanstalt(Germany)

    • Related Report
      2017 Research-status Report
  • [Int'l Joint Research] Physikalisch-Technische Bundesanstalt(Germany)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research]

    • Related Report
      2016 Research-status Report
  • [Journal Article] Development of a simultaneous evaluation method of radioactivity in soil and dose rate using CeBr3 and SrI2(Eu) scintillation detectors for environmental monitoring2019

    • Author(s)
      Kowatari Munehiko, Tanimura Yoshihiko, Kessler Patrick, Neumaier Stefan, Roettger Annette
    • Journal Title

      Progress in Nuclear Science and Technology

      Volume: 6 Issue: 0 Pages: 81-85

    • DOI

      10.15669/pnst.6.81

    • ISSN
      2185-4823
    • Year and Date
      2019-01-31
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Preliminary Study on Determination of Surface Contamination Density on Soil in Heavily Contaminated Areas Using a CeBr3 Scintillation Detector Coupled with Lead Shielding2019

    • Author(s)
      Kowatari Munehiko, Tanimura Yoshihiko
    • Journal Title

      JPS Conf. Proc.

      Volume: 24

    • DOI

      10.7566/jpscp.24.011037

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a simultaneous evaluation method of radioactivity in soil and dose rate using CeBr3 and SrI2(Eu) scintillation detectors for environmental monitoring2018

    • Author(s)
      Munehiko Kowatari, Yoshihiko Tanimura, Patrick Kessler, Stefan Neumaier, Annette Roettger
    • Journal Title

      Progress in Nuclear Science and Technology

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Preliminary Study on Determination of Surface Contamination Density on Soil in Heavily Contaminated Areas Using a CeBr3 Scintillation Detector Coupled with Lead Shielding2018

    • Author(s)
      Munehiko KOWATARI, Yoshihiko TANIMURA
    • Journal Title

      Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Development of a simultaneous evaluation method of radioactivity in soil and dose rate using CeBr3 and SrI2(Eu) scintillation detectors for environmental monitoring2018

    • Author(s)
      Kowatari Munehiko, Tanimura Yoshihiko, Kessler Patrick, Neumaier Stefan, Roettger Annette
    • Organizer
      the Ninth International Symposium On Radiation Safety and Detection Technology (ISORD-9)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preliminary Study on Determination of Surface Contamination Density on Soil in Heavily Contaminated Areas Using a CeBr3 Scintillation Detector Coupled with Lead Shielding2018

    • Author(s)
      Kowatari Munehiko, Tanimura Yoshihiko
    • Organizer
      the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Preliminary Study on Determination of Surface Contamination Density on Soil in Heavily Contaminated Areas Using a CeBr3 Scintillation Detector Coupled with Lead Shielding2018

    • Author(s)
      Munehiko KOWATARI, Yoshihiko TANIMURA
    • Organizer
      ISRD2018 : International Symposium on Radiation Detectors and Their Uses
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of a simultaneous evaluation method of radioactivity in soil and dose rate using CeBr3 and SrI2(Eu) scintillation detectors for environmental monitoring2017

    • Author(s)
      Munehiko Kowatari, Yoshihiko Tanimura, Patrick Kessler, Stefan Neumaier, Annette Roettger
    • Organizer
      The Ninth International Symposium On Radiation Safety and Detection Technology (ISORD-9)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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