论文标题
宇宙MUON通量测量和隧道覆盖结构成像
Cosmic muon flux measurement and tunnel overburden structure imaging
论文作者
论文摘要
我们提出了一个宇宙射线MUON断层扫描实验，用于测量中国长舒的隧道覆盖层结构。这项研究中使用的设备是基于SIPM技术的塑料闪光灯的跟踪检测器，可以在现场工作中方便地操作。敏感面积为$ 6400 cm^2 $的紧凑型系统可以测量宇宙muons的角度分布。它能够成像从覆盖层的表面到探测器沿MUON轨道的覆盖密度长度。隧道外的开放天空通量测量与改良的Gassier公式模型具有良好的一致性。隧道内三个位置上的MUON通量的分布与开放天空的分布非常相似。假设覆盖层的平均密度为$ 2.65 g/cm^3 $，则可以从隧道内部和外部的MUON通量差得出的密度长度获得过覆的厚度。此外，对于已知的穿透长度（即覆盖层的地形），还可以获得覆盖层的密度异常。这项研究表明，具有宇宙射线MUON望远镜的土木工程，隧道或洞穴中的地下结构的可能应用。
We present a cosmic ray muon tomographic experiment for measuring the muon flux and imaging the tunnel overburden structures in Changshu, China. The device used in this study is a tracking detector based on the plastic scintillator with SiPM technology, which can be conveniently operated in field works. The compact system with sensitive area of $6400 cm^2$ can measure the angular distribution of cosmic muons. It's able to image the overburden density length from the surface of overburden to the detector along the muon tracks. The open sky muon flux measurement outside the tunnel has a good agreement with the modified Gassier Formula model. The distributions of muon flux at three positions inside the tunnel are very similar to that of open sky. Assuming the average density of overburden compact sandstone is $2.65 g/cm^3$, the overburden thickness can be obtained from the density length derived from the difference of muon flux inside and outside the tunnel. Moreover, for known penetrated lengths (i.e., topography of overburden), the density anomalies of the overburden can also been obtained. This study suggests a potential application for imaging and detecting subsurface structures in civil engineering, tunnels or caverns with the cosmic ray muon telescope.
