| Song Yanchao,Cui Hongxing,Zhang Qingzhao,Lian Dexing,Hou Changsong,Wu Yunyun.Analysis of intercomparison results for radon-thoron discriminative detector[J].Chinese Journal of Radiological Medicine and Protection,2018,38(12):938-941 |
| Analysis of intercomparison results for radon-thoron discriminative detector |
| Received:May 18, 2018 |
| DOI：10.3760/cma.j.issn.0254-5098.2018.12.011 |
| KeyWords:222Rn 220Rn Discriminative detector Intercomparison |
| FundProject:国家自然科学基金（11375164） |
| Author Name | Affiliation | | Song Yanchao | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Cui Hongxing | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Zhang Qingzhao | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Lian Dexing | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Hou Changsong | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China | | Wu Yunyun | Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Beijing 100088, China |
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| Abstract:: |
| Objective To increase the cumulative measurement level of 222Rn and 220Rn and ensure the accuracy and reliability of the measurement result.Methods By using improved 222Rn-220Rn discriminative detectors (LD-P detectors), the radon research group of National Institute for Radiological Protection Chinese Center for Disease Control and Prevention participated with the intercomparison organized by National Institute of Radiological Science (NIRS), Japan. Specifically, with the 222Rn-220Rn discriminative detectors being sent to Japan, the comparison was completed under different conditions in the 222Rn chamber and 220Rn chamber in NIRS. After exposure, the detectors were sent back to our laboratory for etching and analysis, and then measurement result were informed to NIRS. Finally, NIRS returned the exposure reference values of 222Rn and 220Rn to our laboratory.Results Under the conditions of high and low levels of 222Rn, the relative percentage differences (RPD) between the measured values and the reference value provided by the NIRS were -12.0% and -11.8%, respectively, while coefficients of variation (COV) were 3.0% and 6.2%, respectively. Under the conditions of high level and low levels of 220Rn, the relative percentage differences (RPD) between the measured value and the reference value provided by the NIRS were -0.8% and -8.0%, respectively; coefficients of variation (COV) were 6.7% and 4.5%, respectively.Conclusions This intercomparison result were categorized by NIRS (PRD<10%), with the satisfactory result of LD-P detectors available. |
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