透射型X射线管靶材的分析与评价

目的 分析八种透射靶的X射线出射效率随靶材厚度和X射线管电压的变化规律。方法 保持铍窗厚度和源探测距离不变,采用MCNP软件,对每一种靶材料模拟计算管电压分别为10、20、30、40、50和60 kV时不同厚度靶材料的X射线出射效率。结果 确定了铬、铜、钼、铑、银、钨、金、铅八种靶材在六种电压下的最大X射线出射效率和最佳靶厚。结论 X射线出射效率随靶材厚度增加先增大后减小,出射效率最大时对应最佳靶厚;出射效率和最佳靶厚随管电压的增大而增大,但对不同的靶材,出射效率和最佳靶厚随管电压的增幅不同。

Analysis and Estimate of Target Parameter in Transmission X-ray Tube

Objective To analyse the variation of eight kinds of eight kinds X-ray emitting efficiency with the target thickness and X-ray tube voltage transmission targets. Methods Keeping stable the target thickness and distance between source and detector, X-ray emitting efficiency of different target thickness is calculated by using the MCNP software for eight kinds of targets when the tube voltage is 10kV, 20kV,30kV,40kV,50kV,60kV. Results Maximum X-ray emitting efficiency and optimal target thickness is made certain for the eight kinds targets of ₂₄Cr、₂₉Cu、₄₂Mo、₄₅Rh、₄₇Ag、₇₄W、₇₉Au、₈₂Pb on six kinds of tube voltage. Conclusion X-ray emitting efficiency will increase at first and then decrease and it will to be maximized with the optimal target thickness. Emitting efficiency and optimal target thickness will increase with the increase of the tube voltage increase, but the would be different for different targets.