基于快中子伴随α粒子方法的爆炸物检测技术的蒙特卡罗方法模拟

Monte Carlo Simulation for the Explosives Inspection Technique Based the Associated α-Particle Method

基于快中子伴随α粒子方法的爆炸物检测技术是一种可有效探测隐藏爆炸物的中子探测技术。利用蒙特卡罗Geant4程序模拟计算石墨、水、TNT样品前有、无墙体两种情况在14 MeV中子作用下产生的γ射线在探测器内的能量沉积谱和飞行时间谱,通过对飞行时间谱的分析表明,选取适当的时间窗可在一定程度上抑制探测器上的本底信号。

The explosives inspection technique based the Associated α- particle method can effectively detect hidden explosives. We calculate LYSO detector efficiency and energy response by use of Monte Carlo method. Otherwise, the Monte Carlo code Geant4 was used to simulate accumulative energy spectra and flight time spec- tra of gamma- rays of LYSO from graphite, water, TNT induced by 14 MeV neutron. The calculated results show that the selection of the α - γ coincidences within a certain time interval can drastically suppresses the background.