Maucec M, Rigollet C
Nuclear Geophysics Division, Kernfysisch Versneller Instituut, Zernikelaan 25, Groningen 9747 AA, The Netherlands.
Appl Radiat Isot. 2004 Jul;61(1):35-42. doi: 10.1016/j.apradiso.2004.02.014.
The performance of a detection system based on the pulsed fast/thermal neutron analysis technique was assessed using Monte Carlo simulations. The aim was to develop and implement simulation methods, to support and advance the data analysis techniques of the characteristic gamma-ray spectra, potentially leading to elemental characterisation of innocuous objects using the full spectrum analysis (FSA) approach. The simulations were carried out with a simplified tool, based on a 14MeV DT pulse-neutron source and a bismuth-germanate detector. A MCNP-based method for de-coupling the radiation transport in mixed (n,gamma) fields, to generate separate sets of standard detector gamma-ray responses for individual elements, is outlined. When normalised and experimentally benchmarked in terms of the pulse-neutron source production rate, the standard spectra can be incorporated into algorithms for the FSA of in situ measurements and elemental fingerprinting of the inspected object.
基于脉冲快/热中子分析技术的探测系统性能通过蒙特卡罗模拟进行了评估。目的是开发和实施模拟方法，以支持和推进特征伽马射线光谱的数据分析技术，这可能会利用全谱分析（FSA）方法实现无害物体的元素表征。模拟是使用一个简化工具进行的，该工具基于14MeV的DT脉冲中子源和锗酸铋探测器。概述了一种基于MCNP的方法，用于解耦混合（n，γ）场中的辐射传输，以生成各个元素单独的标准探测器伽马射线响应集。当根据脉冲中子源产生率进行归一化和实验基准测试时，标准光谱可纳入用于现场测量FSA和被检查物体元素指纹识别的算法中。
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