Hanley O, Gutiérrez-Villanueva J L, Currivan L, Pollard D
Radiological Protection Institute of Ireland, 3 Clonskeagh Square, Clonskeagh Road, Dublin 14, Ireland.
J Environ Radioact. 2008 Oct;99(10):1578-82. doi: 10.1016/j.jenvrad.2007.12.018. Epub 2008 Feb 20.
The RPII radon (Rn) laboratory holds accreditation for the International Standard ISO/IEC 17025. A requirement of this standard is an estimate of the uncertainty of measurement. This work shows two approaches to estimate the uncertainty. The bottom-up approach involved identifying the components that were found to contribute to the uncertainty. Estimates were made for each of these components, which were combined to give a combined uncertainty of 13.5% at a Rn concentration of approximately 2500 Bq m(-3) at the 68% confidence level. By applying a coverage factor of k=2, the expanded uncertainty is +/-27% at the 95% confidence level. The top-down approach used information previously gathered from intercomparison exercises to estimate the uncertainty. This investigation found an expanded uncertainty of +/-22% at approximately 95% confidence level. This is good agreement for such independent estimates.
RPII氡（Rn）实验室获得了国际标准ISO/IEC 17025的认可。该标准的一项要求是对测量不确定度进行估计。这项工作展示了两种估计不确定度的方法。自下而上的方法包括识别出被发现对不确定度有贡献的分量。对每个分量进行了估计，在氡浓度约为2500 Bq m(-3)、置信水平为68%时，将这些估计值合并得到的合成不确定度为13.5%。通过应用覆盖因子k = 2，在95%置信水平下扩展不确定度为±27%。自上而下的方法利用先前从比对试验中收集的信息来估计不确定度。这项调查发现在约95%置信水平下扩展不确定度为±22%。对于这样的独立估计，这是很好的一致性。
