Clover型高纯锗探测器使用中的add-back性能

Studies on the add-back Performance of a Clover Type HPGe Detector

高纯锗探测器在γ谱学研究当中一直被广泛应用。本工作基于蒙特卡罗模拟的方法研究了Clover型高纯锗探测器的add-back性能。模拟了单晶体能谱和γ射线在不同晶体间发生康普顿散射的概率。与实验符合后,从γ射线多重性和γ源到探测器距离两个方面对add-back性能进行了研究。研究表明,在γ源距探测器25 cm的条件下,较高的多重性(M=6)对探测器的add-back因子影响不大,主要体现在低能区域。当γ源与探测器的距离减小时,add-back因子变化显著。特别是,在距离为5 cm和分析。

High Purity Germanium(HPGe)detectors have been widely used inγspectroscopy.The add-back performance of Clover type HPGe detector is studied based on Monte Carlo simulation.We have simulated the energy spectrum from a single crystal and the Compton scattering probability ofγray between different crystals.Good agreements have been achieved between the simulated results and experimental data.Afterwards the add-back performance is further studied in terms ofγray multiplicity and the distance betweenγsource and the detector.The studies revealed that the higher multiplicity(M=6)affects slightly on the add-back factor at 25 cm distance,mainly in the low energy region.With the distance decreases,the addback factor changes dramatically.Typically,in the situation of 5 cm distance and M=6,the add-back analysis is not recommended.