提出了一种基于球面晶体的高光谱分辨全视场X射线荧光成像仪,并分析了该成像系统的空间分辨率、视场、能谱带宽、荧光收集效率。根据理论分析设计了一套用于V~Zn等典型中等原子序数金属的Kα线荧光成像系统,并采用解析的理论和本课题组编写的蒙特卡罗光线追迹程序对该系统性能进行了计算和仿真。理论分析和数值仿真的结果表明,这种X射线荧光成像技术具有较高的空间分辨率(优于80 μm)、较大的视场(大于6.5 mm)以及极高的光谱(能谱)分辨率(优于16.5 eV@4.6~9 keV)。

In this study, we propose a spherical crystal based on X-ray fluorescence imaging system with high spectral resolution and full field of view (FOV). Further, the spatial resolution, FOV, spectral bandwidth, and photon collection efficiency are analyzed. Next, we present the design of the fluorescence imaging system for the K_α emission of a metal (V-Zn) with median atomic number according to the theoretical analysis, and the analytic theory and a custom-written Monte Carlo ray-tracing code are used in calculation and simulation. Our theoretical analysis and simulation demonstrate that the X-ray fluorescence imaging technique exhibits a high spatial resolution (<80 μm), large FOV (>6.5 mm), and high spectral resolution (<16.5 eV@4.6-9 keV).