^222Rn-^220Rn累积探测器参加日本组织的国际比对结果分析  

Analysis of international intercomparisons results organized by Japan for integrating 222Rn-220Rn detectors

作　　者：武云云[1] 崔宏星[1] 张庆召[1] 尚兵[1] 苏旭[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088

出　　处：《中华放射医学与防护杂志》2012年第5期514-517,共4页Chinese Journal of Radiological Medicine and Protection

基　　金：基金项目：国家自然科学基金（10675105）

摘　　要：目的通过参加国际比对，提高^222Rn和^220Rn累积测量的水平，保证测量的质量。方法将本实验室的LD—P型^222Rn-^220Rn探测器寄往日本放射线医学综合研究所（NationalInstituteofRadiologicalScience，NIRS），参加^222Rn-^220Rn累积探测器的国际比对。^222Rn比对在NIRS的标准^222Rn室进行，按暴露量分低、中、高3个水平；^220Rn比对在NIRS的^220Rn室进行，也分低、中、高3个水平。暴露结束后将探测器寄回本实验室进行蚀刻、分析，然后把测量结果报给NIRS，最后NIRS将暴露的参考值反馈回本实验室。结果LD—P探测器222Rn比对测量低、中、高3个暴露水平的测量值与参考值的相对偏差（RPD）分别为-13．8％、-14．4％和-17．1％；220Rn比对测量低、中、高3个暴露水平的测量值与参考值的RPD分别为-14．4％、8．9％和-3．2％。结论本次比对LD．P探测器。222Rn和220Rn的测量结果均在NIRS规定的RPD为20％的一级标准范围内。Objective To guarantee the quality of measurements with the radon-thoron discriminative detectors of our laboratory. Methods LD-P radon-thoron discriminative detector participated in the international intercomparison for integrating radon/thoron detectors organized by National Institute of Radiological Science （NIRS, Japan）. Detectors were sent to NIRS for exposure. Radon intercomparison was conducted with radon chamber providing three levels of exposure： low, medium and high levels. Thoron intercomparison was carried out at thoron chamber, which also provided three levels of exposure： low, medium and high levels. Detectors were posted back to our laboratory for etching and analysis after exposure. Then the measured values were submitted to MRS. Finally the reference values were informed of us. Results The relative percent difference （RPD） between the measured value and the reference value for radon was - 13.8%, - 14.4% and - 17.1% at low, medium and high levels respectively, and that of thoron were - 14.4% , 8.9% and - 3.2% at three levels respectively. Conclusions Both radon and thoron measurement of our detectors rank as ＂ Category I＂ in the 4th international intercomparisons for integrating radon/thoron detectors with the NIRS radon/thoron chambers.

关 键 词：222Rn 220Rn 累积探测器 国际比对 

分 类 号：R142[医药卫生—公共卫生与预防医学]