目前国内外对外层包壳为重金属,内层为轻质材料的导弹和点火装置等一般采用X射线或者CT无损扫描技术,但它们均不能很好地反映该类物质的质量可靠性。使用中子成像技术就能很好地解决这一问题。本研究利用中子容易穿透重金属材料而对轻质材料反应截面较大的特点,采用热中子 At present, X-ray or CT non-destructive scanning techniques are commonly used on missiles and ignition devices with outer cladding as heavy metal and inner layer as light materials, but none of them can well reflect the quality and reliability of such materials. The use of neutron imaging technology can solve this problem. In this study, the use of neutrons easily penetrate heavy metals and light materials cross-section larger characteristics, the use of thermal neutrons