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目的探讨以手机信号屏蔽器为标准源进行微波辐射实验室间比对的可行性,建立微波辐射实验室间比对方法。方法采用典型抽样方法,以广东省21家职业卫生技术服务机构的21台微波辐射测量仪器为研究对象。以某手机信号屏蔽器为标准源,对其进行稳定性检验。在距离标准源1.0和1.5 m的测量点进行比对测量,采用基于四分位数稳健统计技术的z比分数对测量结果进行评价。结果标准源稳定性检验中,3个时间段测得的功率密度比较,差异无统计学意义[(26.10±0.94)vs(25.78±0.27)vs(25.83±0.47)μW/cm~2,P>0.05],标准源可满足实验室间比对的稳定性要求。21台仪器中,1台仪器未送检,1台仪器校准证书过期,1台仪器校准结果不合格。21台仪器实验室间z比分数(z_B)为-1.27~4.85,实验室内z比分数(z_W)为-1.42~2.18,其中1台仪器|z_B|>3.00,为离群结果,|z_W|>2.00,为有问题结果。综合评定结果,仅有1台参比仪器比对结果不合格。结论以手机信号屏蔽器为标准源的稳定性较好,可用于微波辐射实验室间比对;所建立的微波辐射实验室间比对方法可较好地评价测量仪器的性能。
Objective To discuss the feasibility of using microwave signal jammers as the standard source to compare microwave radiation among laboratories and to establish an inter-laboratory method of microwave radiation. Methods Using typical sampling methods, 21 microwave radiation measuring instruments of 21 occupational health service agencies in Guangdong Province were studied. With a cell phone signal jammer as the standard source, its stability test. The measurements were compared at measurement points of 1.0 and 1.5 m from the standard sources and the results were evaluated using a z-score based on quartile robust statistical techniques. Results In the standard source stability test, the power densities measured in three time periods showed no significant difference ([(26.10 ± 0.94) vs (25.78 ± 0.27) vs (25.83 ± 0.47) μW / cm ~ 2, P> 0.05]. The standard source can meet the stability requirements of inter-laboratory comparison. Of the 21 instruments, one was not submitted for inspection, one of the instruments had expired and one of the instruments failed the calibration. The z-score (z_B) was -1.27 ~ 4.85 between 21 laboratories and the laboratory z-score (z_W) was -1.42 ~ 2.18. One instrument | z_B |> 3.00 was the outlier result, | z_W |> 2.00, as a result of the problem. Comprehensive assessment results, only one reference instrument comparison results failed. Conclusion The stability of the cell phone signal mask as the standard source is good, which can be used for comparison between microwave radiation laboratories. The established inter-laboratory method of microwave radiation can better evaluate the performance of the measuring instruments.