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arXiv 2304.09489physics.ins-dethep-ex
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面向低Z和高Z材料的μ子散射断层成像系统研究

Towards a muon scattering tomography system for both low-Z and high-Z materials

Jiahui Chen, Huiling Li, Yiyue Li, Pingcheng Liu

AI总结:

本文提出在传统MST系统中加入切伦科夫探测器测量低能μ子动量,并结合动量相关径迹与图像重建,显著提升低Z材料区分能力,实现全能量范围内低Z与高Z材料的同时探测。

摘要:

μ子散射断层成像(MST)是一种利用宇宙射线μ子作为探针对各种材料进行成像的无损技术。典型的配备双层径迹探测器的MST系统在探测高Z材料(例如核材料)方面特别有效,但难以识别低Z材料(例如爆炸物材料)。在本工作中,我们提出了一种MST系统概念,通过使用切伦科夫探测器额外测量低能μ子的动量,来区分低Z和高Z材料。我们开发了一个用于统计检验的简化蒙特卡洛模拟,以描述探测器响应以及μ子穿过材料时的多次散射。基于依赖动量的径迹重建和图像重建算法,我们评估了该系统中不同材料的区分能力。结果表明,对低能μ子的动量测量和精确的径迹重建可以显著提高对低Z材料的区分能力。这可能使MST系统能够利用整个能量范围内的宇宙射线μ子同时探测低Z和高Z材料。

英文摘要:

Muon scattering tomography (MST) is a non-destructive technique to image various materials by utilizing cosmic ray muons as probes. A typical MST system with a two-fold track detectors is particularly effective in detecting high-$Z$ materials (e.g. nuclear materials), but difficult to recognize low-$Z$ materials (e.g. explosive materials). In this work, we present a concept of MST system to discriminate both low-$Z$ and high-$Z$ materials by extra measuring momentum of low-energy muons with a Cherenkov detector. A toy Monte Carlo simulation to describe detector responses and multiple scatterings of a muon tracking through materials is developed for statistical tests. Based on momentum-dependent track reconstruction and image reconstruction algorithm, we evaluate separation powers of different materials in the system. The results show that momentum measurement of low-energy muons and accurate track reconstruction can improve separation power of low-$Z$ materials significantly. This may enable the MST system to detect both low-$Z$ and high-$Z$ materials with cosmic ray muons in the whole energy range.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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