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| The influence of the detection window wrapped with plastic film on the surface contamination detection |
| CHEN Zhongmin, HU Hongfang, LI Wei, DONG Suhe, YU Huijie, WANG Sinian, LV Xiaoli, DENG Zhirong |
| Rocket Force Characteristic Medical Center, Beijing 100088 China |
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Abstract Objective To study the influence of the detection window of the surface contamination detector wrapped with plastic film on the surface contamination detection.Methods RDA150 and Como170 type surface contamination detectors were selected to measure the surface α-ray contamination level of Americium-241 source under the condition of no film, single-layer film and double-layer film covering the observation window of the equipment, respectively.Results Under the condition of no film, the average measurement result of RDa150 surface contamination detector's 5 measurements was 228.01 Bq/cm2, and that of Como170 type surface contamination detector was 231.05 Bq/cm2; Under the condition of single-layer film covering, the average measurement results of RDa150 type surface contamination detector's 5 measurements was 96.34 Bq/cm2, and the Como170 surface contamination detector were 100.31 Bq/cm2 which decreased by about half. Under the condition of double-film coverage, the average measurement results of RDa150 type surface contamination detector's 5 measurements were 0.45 Bq/cm2, and the Como170 type surface contamination detector were 0.65 Bq/cm2.Conclusion When the surface contamination level is high, a single layer of plastic film can be used to cover the equipment detection window to reduce the risk of equipment contamination. When the decontamination is completed or the level of surface contamination is low, the equipment detection window cannot be wrapped with plastic film.
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Received: 09 May 2020
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