为了提升国内氡计量能力,组织了全国11家已建标实验室的标准级测氡仪开展统一校准。在校准的基础上,开展了低浓度测量比对,分析参比实验室在低浓度水平处进行量值传递的可行性。统一校准在700~3000Bq/m3氡浓度量级进行,氡浓度参考值可溯源至氡活度基准装置,不确定度为1.6%(k=2)。各标准级测氡仪的体积活度响应范围为0.93~1.02,不确定度范围为2.2%~3.6%(k=2)。低浓度比对在100~400Bq/m3氡浓度量级进行,大部分标准级测氡仪的En值小于1,通过优化量传的策略,标准级测氡仪在100 Bq/m3以上开展量值传递是可行的;但在100 Bq/m3或以下浓度量级开展量值传递,各参比实验室仍需提升测量能力及氡浓度调控能力。
Abstract
To improve the capacity of radon metrology in China, the standard radon monitors from 11 standard laboratories were calibrated uniformly. The low-level concentration comparison was conducted base on the unified calibration. The unified calibration was carried out at 700~3000Bq/m3 radon concentration, and the reference value of radon concentration can be traced to the primary standard of radon activity, Urel=1.6% (k=2). The range of response to reference radon atmosphere for standard radon monitors are 0.93~1.02, and the uncertainties range are 2.2%~3.6% (k=2). The low-level concentration comparison was carried out at 100~400Bq/m3, the most standard radon monitors En<1. By optimizing the strategy, it is feasible for standard radon moniters to transfer above 100Bq/m3. However, it is necessary to improve the ability of measurement and concentration control for each laboratory to carry out transfer at concentration of 100Bq/m3 or below.
关键词
电离辐射计量;氡体积活度 /
标准级测氡仪;校准;国内比对
Key words
ionizing radiation metrology /
radon volume activity /
standard radon monitor /
calibration /
domestic comparison
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基金
中国计量科学研究院基本科研业务费重点领域(AKYZD2113,AKYZD2015-1)
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