Journal of Radiation Industry (방사선산업학회지)

Korean Society of Radiation Industry (한국방사선산업학회)
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Evaluation of Minimum Detectable Activity for Underwater Radiation Monitoring System

수중 방사선 모니터링 시스템의 성능평가를 위한 수중 내 최소검출가능농도 산출

  • Jangguen Park (Radioisotope Research Division, Korea Atomic Energy Research Institute) ;
  • Sung-Hee Jung (Radioisotope Research Division, Korea Atomic Energy Research Institute) ;
  • Daemin Oh (Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Jinho Moon (Radioisotope Research Division, Korea Atomic Energy Research Institute)
  • 박장근 (한국원자력연구원 동위원소연구부) ;
  • 정성희 (한국원자력연구원 동위원소연구부) ;
  • 오대민 (한국건설기술연구원 환경연구본부) ;
  • 문진호 (한국원자력연구원 동위원소연구부)
  • Received : 2023.05.12
  • Accepted : 2023.09.12
  • Published : 2023.09.30
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Abstract

A high-efficiency underwater radiation monitoring system, HydroGamma, has been developed for detecting 137Cs and 131I in the event of waterborne radiation contamination. The system consists of a 3-inch NaI (Tl) detector, solar panels for power supply, data acquisition and transmission modules, and batteries. HydroGamma also includes a 40K calibration source for remote performance evaluation and energy calibration. In this study, some simulations and experiments were carried out to evaluate the minimum detectable activities (MDA) of HydroGamma. We installed the HydroGamma at Tapjeongho Lake in Nonsan-si and acquired background data since MDA is calculated based on the experimental background data. The results show that the minimum detectable activities for 137Cs and 131I were 1.78Bq L-1 and 1.81Bq L-1, respectively even though the gamma rays emitted from 40K(1,460 keV) affect the minimum detectable activities for them.

Keywords

Acknowledgement

본 연구는 과학기술정보통신부의 재원으로 한국원자력연구원 주요사업(방사성동위원소 응용 표준화기술 개발, 524440-23), 공공수요 기반 혁신제품 개발·실증사업(NRF-2021M3E8A2100652), 국가과학기술연구회 창의형 융합사업(No. CAP-15-07-KICT)의 일환으로 수행되었습니다.

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