Optimising the neutron environment of Radiation Portal Monitors: A computational study
Optimising the neutron environment of Radiation Portal Monitors: A computational study
复制标题
优化辐射入口监测器的中子环境:一项计算研究
DOI:
10.1016/j.nima.2015.05.060
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Gilbert M
中科院分区:
文献类型:
--
作者:
Gilbert M
Efficient and reliable detection of radiological or nuclear threats is a crucial part of national and international efforts to prevent terrorist activities. Radiation Portal Monitors (RPMs), which are deployed worldwide, are intended to interdict smuggled fissile material by detecting emissions of neutrons and gamma rays. However, considering the range and variety of threat sources, vehicular and shielding scenarios, and that only a small signature is present, it is important that the design of the RPMs allows these signatures to be accurately differentiated from the environmental background. Using Monte-Carlo neutron-transport simulations of a model helium-3 detector system we have conducted a parameter study to identify the optimum combination of detector shielding and collimation that maximises the sensitivity of RPMs. These structures, which could be simply and cost-effectively added to existing RPMs, can improve the detector response by more than a factor of two relative to an unmodified, bare design. Furthermore, optimisation of the air gap surrounding the helium tubes also improves detector efficiency.
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