根据端窗透射微型X射线管阳极靶的结构, 建立了数理模型, 讨论了电子束打靶的平均厚度与光管高压的关系, 得到了X光管出射特征光谱强度的角度分布特征。 同时利用Monte Carlo方法, 对出射光谱在2π方向上的强度分布特征开展模拟研究。 结果表明, 微型X射线管阳极靶材平均厚度在2 μm左右, 在与入射电子束垂直方向几度的范围内获得的出射光谱其单色性较好。 这些结论对于微型X射线管的结构设计和出射光谱单色化应用具有一定的理论指导意义。

The present paper established a mathematical model, according to the structure of the end-window transmission micro X-ray tube anode. And we discussed the relationship between the average thickness of electron beam targeting and the high voltage. Also we obtained the spectral intensity distribution characteristics of the emitted X-ray on the angle, meanwhile by the use of Monte Carlo, the authors simulated the intensity distribution characteristics of the spectrum in the direction of 2π. The results show that the average thickness of the micro X-ray tube anode target is about 2 μm, and we can get much better single-energy spectrum in the vertical direction of the incident electron beam within a few degrees. These conclusions have some theoretical significance for the structural design of the micro X-ray tube and the emitted spectrum monochrome applications.