In this study, the instrumental neutron activation analysis (INAA) process has been simulated using Monte Carlo method in three steps at Isfahan Miniature Neutron Source Reactor (MNSR), and simulation results have been validated by experiments. The thermal neutron flux at the inner irradiation channel of the reactor and the effective multiplication factor (keff) of the reactor have been investigated by both Monte Carlo simulations and experiments. The Certified Reference Material (CRM) LKSD-4 geology sample has been irradiated in the inner irradiation channel for 60 s, and the gamma spectrum of the activated sample have been measured for 500s after52 s cooling time. The gamma spectrum has been obtained by the HPGe detector. The corrections related to the background spectrum and the detector resolution have been calculated and applied to the results. An experiment has been performed in the similar condition, and the results have been compared with the simulation. The results have showed an acceptable confirmation between experiment and simulation. This method can be used as an effective tool for prediction of the INAA procedure before performing the real analyze on the samples.

中文翻译：

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蒙特卡洛法模拟仪器中子活化分析


本研究在伊斯法罕微型中子源反应堆 （MNSR） 采用蒙特卡洛方法分三步模拟了仪器中子活化分析 （INAA） 过程，并通过实验验证了仿真结果。通过蒙特卡洛模拟和实验研究了反应器内部辐照通道处的热中子通量和反应器的有效倍增因子 （keff）。认证标准物质 （CRM） LKSD-4 地质样品在内部辐照通道中照射 60 s，并在 52 s 冷却时间后测量活化样品的伽马光谱 500 s。伽马光谱由 HPGe 探测器获得。已计算出与背景光谱和探测器分辨率相关的校正，并将其应用于结果。在类似条件下进行了实验，并将结果与模拟结果进行了比较。结果表明，实验和仿真之间的确认是可接受的。该方法可用作在对样品进行实际分析之前预测 INAA 程序的有效工具。