基于单加速器的X射线及中子射线双模成像方法研究

X射线、中子射线成像均是重要的无损检测方法。由于中性射线的衰减程度是由射线所穿透成像物的质量衰减系数和质量厚度共同决定的，仅凭单一射线的衰减信息无法实现对成像物物质构成的分析。如果将X射线衰减和中子衰减这两个信息进行融合，则质量衰减系数和质量厚度这两个未知量就都可以知道，从而在传统的分析几何结构信息（由质量厚度信息提供）的基础上，还能进一步分析成像物的物质构成（由质量衰减系数提供）。但一般的X射线成像装置和中子成像装置都无法同时提供两种成像能力。本项目提出基于单加速器的双模成像方法，在一个电子加速器的驱动下，同时获得X射线成像束流和慢（热）中子分能成像束流，对同一个成像物分别进行X射线成像和分能中子成像，并研究将两种射线成像信息的融合方法，同时提取成像物的几何结构和物质构成信息。本研究将促进我国射线无损检测技术的发展，助力重要工业技术的升级。

As the attenuation of neutral radiation is determined by both the mass thickness and the mass attenuation coefficient of the inspected material, which is penetrated by the neutral radiation, the composition of the inspected material thus cannot be acquired through analyzing the attenuation of only one radiation, which can be X-ray or neutron. However, if the attenuation of X-ray and neutron can be fused together, then both the mass thickness and the mass attenuation coefficient of the inspected material can be acquired. Thus, not only the geometric image, which is based on information of the mass thickness, but also the composition of the inspected material, which is based on information of the mass coefficient, can be simultaneously provided. Because the usual used facilities of X-ray imaging and neutron imaging can only provide single-radiation-imaging, a bimodal radiation imaging method realized with a single electron accelerator, in which the X-ray beam and neutron beam can be simultaneously provided, will be researched. The X-ray image and energy selective neutron image of the inspected material will be acquired and fused to extract information of the geometry and the composition of the inspected material. The research in this proposal will enhance the ability of the non-destructive analysis of China, which in turn improves the state of the art of the industrial manufacturing.