Detection and consideration of radiation abnormalities in public areas
Objective To measure the air-absorbed dose rate of gamma radiation in public areas for the situation of the local radiation environment.Methods Using a large-volume γ spectrometer system with a NaI(Tl)detector mounted on a UAV,we conducted large-scale airborne radiation monitoring in public areas in southwestern China,to measure the air-ab-sorbed dose rate at a height of 1 m from the earth's surface.Results The airborne radiation monitoring data were used to analyze the local radiation environment.The mean air-absorbed dose rate at a height of 1 m was 43.6±12.9 nGy/h.Seven abnormal radiation points were detected,and two of them were located where construction was ongoing.At one of the abnor-mal radiation points,FH40G meter measurements showed that the air-absorbed dose rate at a height of 1 m was up to 22.0 μGy/h.Field soil samples were collected for HPGe γ spectrometer analysis:the 232Th radionuclide activity concentration was 96.0 kBq/kg,and the 226Ra radionuclide activity concentration was 9.9 kBq/kg.Conclusion Using the UAV-mounted large-volume γ spectrometer system with NaI(Tl)detectors for large-scale airborne monitoring is a fast and effective method for dragnet monitoring of the level of radiation in public areas.
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