Nikolic J D, Jokovic D, Todorovic D, Rajacic M
University of Belgrade, Institute for Nuclear Sciences, Vinča Mike Petrovica Alasa 12-14, Belgrade, Serbia.
J Radiol Prot. 2014 Jun;34(2):N47-55. doi: 10.1088/0952-4746/34/2/N47. Epub 2014 Jun 4.
The determination of radionuclide activity concentration requires a prior knowledge of the full-energy peak (FEP) efficiency at all photon energies for a given measuring geometry. This problem has been partially solved by using procedures based on Monte Carlo simulations, developed in order to complement the experimental calibration procedures used in gamma-ray measurements of environmental samples. The aim of this article is to apply GEANT4 simulation for calibration of two HPGe detectors, for measurement of liquid and soil-like samples in cylindrical geometry. The efficiencies obtained using a simulation were compared with experimental results, and applied to a realistic measurement. Measurement uncertainties for both simulation and experimental values were estimated in order to see whether the results of the realistic measurement fall within acceptable limits. The trueness of the result was checked using the known activity of the measured samples provided by IAEA.
放射性核素活度浓度的测定需要事先了解给定测量几何条件下所有光子能量处的全能峰（FEP）效率。通过使用基于蒙特卡罗模拟的程序，这个问题已得到部分解决，开发这些程序是为了补充环境样品伽马射线测量中使用的实验校准程序。本文的目的是应用GEANT4模拟对两个高纯锗探测器进行校准，用于测量圆柱形几何形状的液体和类土壤样品。将模拟得到的效率与实验结果进行比较，并应用于实际测量。估算了模拟值和实验值的测量不确定度，以查看实际测量结果是否落在可接受的范围内。使用国际原子能机构提供的被测样品的已知活度来检验结果的准确性。
