用于核违禁品探测的第一个原型μ子断层成像系统的设计和建造
Design and Construction of a First Prototype Muon Tomography System with GEM Detectors for the Detection of Nuclear Contraband
摘要：
目前在海港和国际边界采用标准辐射探测技术的辐射门户监测器对核违禁品不是很敏感，因为这些违禁品受到很好的屏蔽，可以吸收放射出的辐射。μ子层析成像（MT）是一种基于测量大气宇宙线μ子穿过含有高Z物质的货物或车辆的多次散射的被动探测技术。我们报告的小型原型MT站的小型微型气体探测器的设计和建设。该站将采用10个跟踪站，这些跟踪站采用30厘米x30厘米的低质量三重GEM探测器，具有二维读数。由于GEM的出色空间分辨率，在跟踪站之间仅使用几厘米的间隙就足够了。加上GEM探测器的紧凑尺寸，这使得GEM MT台站比使用传统漂移管的MT台站紧凑一个数量级。我们目前的生产和组装的GEM为基础的跟踪站与欧洲核子研究中心和RD51合作，以及初始前端电子和读出系统的设计的细节。
英文摘要：
Current radiation portal monitors at sea ports and international borders that employ standard radiation detection techniques are not very sensitive to nuclear contraband that is well shielded to absorb emanating radiation. Muon Tomography (MT) based on the measurement of multiple scattering of atmospheric cosmic ray muons traversing cargo or vehicles that contain high-Z material is a promising passive interrogation technique for solving this problem. We report on the design and construction of compact Micro-Pattern Gas Detectors for a small prototype MT station. This station will employ 10 tracking stations based on 30cm x 30cm low-mass triple-GEM detectors with 2D readout. Due to the excellent spatial resolution of GEMs it is sufficient to use a gap of only a few cm between tracking stations. Together with the compact size of the GEM detectors this allows the GEM MT station to be an order of magnitude more compact than MT stations using traditional drift tubes. We present details of the production and assembly of the GEM-based tracking stations in collaboration with CERN and the RD51 collaboration as well as the design of the initial front-end electronics and readout system.
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