利用蒙特卡罗方法提出了一种厚度2 mm 的钨制降散射网栅设计方法，采用精密机械钻孔技术实现了幅面52 mm×52 mm 网栅研制，并基于450 kV 中能X 光机实验平台开展了网栅降散射能力闪光照相实验，同时采用蒙特卡罗方法进行了数值模拟验证。成像实验结果显示，使用该网栅后中能闪光照相图像质量发生实质性改善，样品芯部界面清晰度得到显著提升。数值模拟结果表明，使用降散射网栅后，辐射成像任意位置的散射灰度均低于直穿灰度，二者之比较无网栅状态下降约74.7%。

An effective design of a tungsten anti-scattering grid with 2 mm in thickness for medium-energy X-ray imaging is proposed. The grid is produced by precise mechanical drilling technology and is with the typical size of 52 mm × 52 mm. The flash radiographic experiments to test grid anti-scattering performance are performed based on a 450 kV medium-energy X-ray source, and the numerical simulation by the Monte Carlo method is also carried out. The imaging experimental results show that the image quality of flash radiography is improved substantially after the grid is used, and the boundary clarity in the sample core is enhanced obviously. The numerical simulation results indicate that scattering gray at any image position is lower than direct gray when the anti-scattering grid is used, and the ratio of scattering gray to direct gray is reduced by 74.7% compared to that without grids.