geant4主程序，实现样品的荧光数据采集，这只是geant4编程中主函数，-main program geant4 sample fluorescence data acquisition, which main function just geant4 programming, thank you

用于对球面晶体的X射线衍射成像的光线追迹模拟，可以仿真自发辐射成像，背光成像，以及荧光成像。(Ray tracing simulation for X ray imaging based on spherical crystals. It can simulate x-ray emission imaging, backlight imaging and fluorescence imaging.)