Persson Leif, Boson Jonas, Nylén Torbjörn, Ramebäck Henrik
Swedish Defence Research Agency, FOI CBRN Defence and Security, SE-901 82 Umeå, Sweden; Department of Mathematics and Mathematical Statistics, Umeå University, SE-90187 Umeå, Sweden.
Swedish Radiation Safety Authority, SSM, SE-171 16 Stockholm, Sweden.
J Environ Radioact. 2018 Jul;187:1-7. doi: 10.1016/j.jenvrad.2018.02.003. Epub 2018 Feb 17.
In situ gamma-ray spectrometry has since the introduction of portable germanium detectors been a widely used method for the assessment of radionuclide ground deposition activity levels. It is, however, a method that is most often associated with fairly large and, more important, poorly known combined measurement uncertainties. In this work an uncertainty analysis of in situ gamma ray spectrometry in accordance with the Guide to the Expression of Uncertainty in Measurements is presented. The uncertainty analysis takes into account uncertainty contributions from the calibration of the detector system, the assumed activity distribution in soil, soil density, detector height and air density. As a result, measurement results from in situ gamma spectrometry will serve as a better basis for decision-making in e.g. radiological emergencies.
自从便携式锗探测器问世以来，原位伽马射线能谱法一直是评估放射性核素地面沉积活度水平的一种广泛使用的方法。然而，该方法通常与相当大且更重要的是鲜为人知的综合测量不确定度相关联。在这项工作中，根据《测量不确定度表示指南》对原位伽马射线能谱法进行了不确定度分析。该不确定度分析考虑了探测器系统校准、土壤中假定的活度分布、土壤密度、探测器高度和空气密度等不确定度来源。因此，原位伽马能谱法的测量结果将为例如放射应急中的决策提供更好的依据。
