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| Detection and consideration of radiation abnormalities in public areas |
| YANG Jinzheng1,2, FANG Jiangqi1,2, ZHANG Wenfeng1,2, LIU Linfeng1,2, WU Mingyang1,2, NIU Guochen1,2 |
1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang 050002 China;
2. CNNC Engineering Technology Research Center of Airborne Monitoring for Nuclear Emergency; Shijiazhuang 050002 China |
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Abstract 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-absorbed 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 abnormal 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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Received: 11 March 2024
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