수중 방사선 모니터링 시스템의 성능평가를 위한 수중 내 최소검출가능농도 산출
Evaluation of Minimum Detectable Activity for Underwater Radiation Monitoring System
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초록
A high-efficiency underwater radiation monitoring system, HydroGamma, has beendeveloped for detecting 137Cs and 131I in the event of waterborne radiation contamination. The systemconsists of a 3-inch NaI (Tl) detector, solar panels for power supply, data acquisition and transmissionmodules, and batteries. HydroGamma also includes a 40K calibration source for remote performanceevaluation and energy calibration. In this study, some simulations and experiments were carried outto evaluate the minimum detectable activities (MDA) of HydroGamma. We installed the HydroGammaat Tapjeongho Lake in Nonsan-si and acquired background data since MDA is calculated based on theexperimental background data. The results show that the minimum detectable activities for 137Cs and 131Iwere 1.78 Bq L-1 and 1.81 Bq L-1, respectively even though the gamma rays emitted from 40K (1,460 keV)affect the minimum detectable activities for them.
Abstract
A high-efficiency underwater radiation monitoring system, HydroGamma, has beendeveloped for detecting 137Cs and 131I in the event of waterborne radiation contamination. The systemconsists of a 3-inch NaI (Tl) detector, solar panels for power supply, data acquisition and transmissionmodules, and batteries. HydroGamma also includes a 40K calibration source for remote performanceevaluation and energy calibration. In this study, some simulations and experiments were carried outto evaluate the minimum detectable activities (MDA) of HydroGamma. We installed the HydroGammaat Tapjeongho Lake in Nonsan-si and acquired background data since MDA is calculated based on theexperimental background data. The results show that the minimum detectable activities for 137Cs and 131Iwere 1.78 Bq L-1 and 1.81 Bq L-1, respectively even though the gamma rays emitted from 40K (1,460 keV)affect the minimum detectable activities for them.
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