Knezevic J, Mrdja D, Hansman J, Bikit K, Forkapic S, Bikit I, Velimirovic D, Kuzmanovic P
University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovica 4, Novi Sad, Serbia.
University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovica 4, Novi Sad, Serbia.
Appl Radiat Isot. 2022 Nov;189:110421. doi: 10.1016/j.apradiso.2022.110421. Epub 2022 Aug 24.
Standard reference sources, used for efficiency curve calibration of detector, often contain radionuclides with complex decay schemes (such as Co, Y, Eu …), introducing a potential problem in gamma-ray spectrometry, due to the appearance of coincidence summing of detected photons, in particular at a low source-detector distance. In this paper, a set of Monte Carlo simulations of an identical experimental setup were performed in order to obtain the efficiency curve of coaxial p-type HPGe detector for energy region (0-2) MeV, with the effect of true coincidence summing and without it. Obtained efficiency curves are compared with the experimental curve after applied EFFTRAN corrections. Fairly well agreement (between simulated and experimental curves with EFFTRAN corrections (with a relative deviation of 10%) proved the reliability of EFFTRAN corrections, as well as the possibility of Monte Carlo simulations for efficiency curve determination.
用于探测器效率曲线校准的标准参考源通常包含衰变方案复杂的放射性核素（如钴、钇、铕……），这在伽马射线能谱分析中会引发潜在问题，因为会出现探测到的光子的符合相加现象，尤其是在源 - 探测器距离较小时。本文进行了一组相同实验装置的蒙特卡罗模拟，以获得同轴p型高纯锗探测器在能量范围（0 - 2）MeV时的效率曲线，分别考虑了真符合相加效应和无此效应的情况。将得到的效率曲线与应用EFFTRAN校正后的实验曲线进行比较。（模拟曲线与经EFFTRAN校正后的实验曲线之间）相当好的一致性（相对偏差为10%）证明了EFFTRAN校正的可靠性，以及通过蒙特卡罗模拟确定效率曲线的可能性。
