Optimising the neutron environment of Radiation Portal Monitors

优化辐射入口监测器的中子环境

• 批准号: ST/K000160/1
• 负责人: John McMillan
• 金额: $ 5.96万
• 依托单位: University of Sheffield
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FK000160%2F1
• 关键词: Optimising; neutron; environment; Radiation; Portal

Radiation portal monitors (RPMs) are currently installed at traffic choke points at ports and airports with little regard to their operating environment. Simple analyses suggest that the signal-to-noise ratio of the neutron components of these systems can be improved by judicious shielding, collimation and modifications of the environment, and that these can be done while improving throughput. This proposal will provide a detailed analysis, quantification and costing of these improvements. In addition to the threat neutron flux which the RPMs are intended to detect, there is a background flux of neutrons, predominantly the result of cosmic ray induced reactions in the atmosphere, in the ground below the detectors and also in adjacent infrastructure, in vehicles and their cargos. This background flux has quite a different directional distribution to the expected threat flux, so by shielding and collimation, it is possible to significantly reduce the background counts, improving the overall signal-to-noise ratio. This will result directly in a reduction of the minimum detectable amounts of threat material. Alternatively, the improved statistics can be used to make the same diagnosis in reduced time.

辐射门户监测器（RPM）目前安装在港口和机场的交通阻塞点，很少考虑其运行环境。简单的分析表明，这些系统的中子成分的信噪比可以通过明智的屏蔽、准直和环境的修改来提高，并且这些可以在提高吞吐量的同时进行。本提案将对这些改进进行详细的分析、量化和费用计算。除了RPM打算探测的威胁中子通量之外，还有中子的背景通量，主要是大气中、探测器下方的地面中以及邻近的基础设施中、车辆及其货物中的宇宙射线诱导反应的结果。该背景通量与预期的威胁通量具有相当不同的方向分布，因此通过屏蔽和准直，可以显著减少背景计数，提高总体信噪比。这将直接导致威胁材料最低可检测量的减少。或者，改进的统计数据可以用于在更短的时间内做出相同的诊断。

项目成果

The production of wavelength shifting lightguides from clear acrylic sheet by disperse dyeing

通过分散染色从透明亚克力板生产波长转换光导

• 期刊: Nuclear Instruments And Methods in Physics Research A
• 作者: McMillan, J.E.