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首页> 外文期刊>Journal of spectroscopy >Semiempirical Efficiency Calibration in Semiconductor HPGe Gamma-Ray Spectroscopy
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Semiempirical Efficiency Calibration in Semiconductor HPGe Gamma-Ray Spectroscopy

机译：半导体HPGe伽马射线能谱中的半经验效率校准

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One of the main problems in quantitative gamma-ray spectroscopy is the determination of detection efficiency, for different energies, source-detector geometries, and composition of samples or sources. There are, in principle, three approaches to this issue experimental, numerical, and semiempirical. Semiempirical approach is based on the calculation of the efficiency for the measured sample on the basis of an experimental efficiency measured on the same detector, but with a calibration source that can be of different size, geometry, density, or composition—the so-called efficiency transfer. The aim of this paper is to analyze the semiempirical approach, using EFFTRAN and MEFFTRAN software as a typical example. These software were used in the Department of Radiation and Environmental Protection, Vinča Institute of Nuclear Sciences, on three HPGe detectors. The results were compared to the experimentally obtained efficiency, and further validation is performed by measuring reference materials issued within the framework of several interlaboratory intercomparisons. The analysis of the results showed that the efficiency transfer produces good results with the discrepancies within the limits of the measurement uncertainty. Also, for intercomparison measurement, utest criterion for the trueness of the result was applied showing that the majority of the obtained results were acceptable. Some difficulties were identified, and the ways to overcome them were discussed.
机译：定量伽马射线光谱法的主要问题之一是确定不同能量，源-检测器的几何形状以及样品或源的组成的检测效率。原则上，有三种方法可以解决此问题：实验方法，数值方法和半经验方法。半经验方法基于在同一检测器上测量的实验效率的基础上，对被测样品的效率进行计算，但校准源的大小，几何形状，密度或成分可以不同，即所谓的效率转移。本文的目的是使用EFFTRAN和MEFFTRAN软件作为典型示例来分析半经验方法。这些软件已在Vinča核科学研究所辐射与环境保护部的三个HPGe检测器上使用。将结果与实验获得的效率进行比较，并通过测量在几个实验室间比对的框架内发布的参考材料来进行进一步验证。结果分析表明，效率转移在测量不确定度范围内产生了良好的结果。同样，对于比对测量，采用了关于结果真实性的utest准则，表明大多数获得的结果都是可以接受的。确定了一些困难，并讨论了克服这些困难的方法。

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