新型缪子散射成像探测器研制

Muon Scattering Tomography(MST) has vast application prospect, like in nuclear material detection, geophysics and volcano science, environmental science and soil thickness measurement, reactor and nuclear fuel imaging, mechanical engineering and large-scale pipeline detection, and other fields. As an advanced imaging technology, developing a kind of detector with large scale, high position resolution, and suitable in various environments is crucial to MST detecting technology. This research intends to use scintillator fiber positioning, with new-type photoelectric sensor such as SiPM, to develop high-resolution muon detector for the verification in experimental prototype and theoretical model , it will be made use of the appliation in engineering in the future. R&D of fiber positioning and readout method can be applied for a new generation of digital calorimeter readout; the high resolution setup of cosmic ray muon can be also used for the performance test of various detectors in the nuclear and particle physics experiments.

宇宙线μ子散射成像（Muon Scattering Tomography, 简称MST）,在核材料检测,地球物理与火山学，环境科学与土壤厚度测量，反应堆与核燃料成像，机械工程与大型管道检测，等领域有广泛的应用前景. 虽然基于MST原理的探测技术研发已有十多年,但作为一种新的成像技术,大面积,具有良好位置分辨, 适用于MST在多种应用环境要求的探测器, 仍然是MST应用研究亟待解决的关键问题。本项研究，拟采用闪烁体光纤定位,配合新型光电转换器件,研发高分辨μ子探测器,用于MST实验与理论模型验证,为MST技术的工程应用奠定基础. 研发的光纤定位与SiPM读出方法可用于新一代数字量能器读出;研制的高分辨宇宙线μ子测试装置,可用于核与粒子物理实验各种粒子探测器性能测试.

本项目针对宇宙线散射成像（Muon Scattering Tomography，MST）探测器的关键技术问题，在模拟计算， 探测器工艺，以及散射径迹重建方法上开展了深入地 研究，获得了重要进展。研制的特殊构型闪烁探测器原形，配合光纤+半导体硅光倍增管读出，其位置分辨小于好于设计指标。提出了一种新的定位分析和修正方法 有效提高探测器径迹分辨，修正后位置分辨达到0.98mm 。建立一套完整的宇宙线成像测试系统，开展MST探测器性能研究。大量实验数据分析证明基于该探测器搭建成像系统完全满足MST对于高Z材料分辨和成像要求。这些研究成果为进一步研制高分辨μ子成像仪器设备奠定了基础.