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目的分析定向辐射X射线管的X射线出射效率和平均能量随靶角和管电压的变化规律,同时分析其在X射线出射方向一定区域内的强度分布。方法采用MCNP软件,模拟计算管电压分别为30 kV、60 kV、90 kV、120 kV、160 kV时,不同靶角X射线管在无过滤片和有过滤片情况下的X射线出射效率和能谱分布。结果确定了定向辐射X射线管在五种管电压及无过滤和有过滤情况下的X射线出射效率、最佳靶角、平均能量、X射线能谱和强度分布。结论 X射线出射效率随管电压的增大而增大,随靶角的增大先增大后减小,存在一个最佳靶角。对同一管电压,在无过滤片时,最佳靶角在46°附近;有过滤片时,最佳靶角随管电压的增大而增大。平均能量随管电压的增大而增大,随靶角的增大而减小。对同一管电压,最佳靶角随过滤片增厚而减小。X射线强度分布在X射线管轴向方向不对称,而在径向方向对称。
Objective To analyze the X-ray emission efficiency and average energy of directional radiation X-ray tube with the variation of target angle and tube voltage, and analyze the intensity distribution in a certain region of X-ray emission direction. Methods The MCNP software was used to simulate the X-ray emission efficiency of X-ray tube at different target angles without filter and filter under the conditions of 30 kV, 60 kV, 90 kV, 120 kV and 160 kV respectively Spectrum distribution. Results The X-ray emission efficiency, the optimal target angle, the average energy, the X-ray energy spectrum and the intensity distribution of the directional radiation X-ray tube under five kinds of tube voltages and without filtration and filtration were determined. Conclusion The X-ray emission efficiency increases with the increase of tube voltage, then increases with the increase of target angle and then decreases. There exists an optimal target angle. For the same tube voltage, in the absence of filter, the best target angle of 46 ° in the vicinity; with filter, the optimal target angle increases with the tube voltage increases. The average energy increases with the tube voltage increases, with the target angle increases and decreases. For the same tube voltage, the optimal target angle decreases as the filter thickens. The X-ray intensity distribution is asymmetric in the axial direction of the X-ray tube and symmetrical in the radial direction.