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首页> 外文会议>Conference on Medical Imaging: Physics of Medical Imaging >On the Angular Dependence of Bremsstrahlung X-ray Emission
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On the Angular Dependence of Bremsstrahlung X-ray Emission

机译：关于Bremsstrahlung X射线发射的角度依赖性

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The angular probability distribution of x-rays from a single interaction of a high energy electron with a target atom is a function of the incident-electron energy, direction and target material. This distribution can be quite directional, which suggests that x-ray tube efficiency might be increased if this effect was used. This can be important for novel tubes that use scanning electron beams or carbon nanotubes that have low output flux. We performed Monte Carlo(MC) simulations for studying how this angular distribution is affected by the interactions in thick targets. The theoretical distribution for single-atom interaction was verified using a 4nm tungsten (W) sphere. Contributions of the various processes undergone by the electrons and x-ray photons were analyzed individually. The angular distributions of x-rays generated by electrons incident normally and at a grazing angle to a 4mm thick target were calculated. The results for a 12uxn transmission target were also simulated. For single interactions, the theoretical peak for 120keV electron at 28?was measured to be 29?for the MC simulations. The transmission target was found to have 26% higher x-ray output in the forward direction compared to a conventional tube for E>30keV. When x-ray flux per unit heat was considered for E>30, grazing incidence of electrons and the associated reflection beam was found to be 41% more efficient than a conventional tube.
机译：来自具有目标原子的高能量电子的单个相互作用的X射线的角度概率分布是入射电子能量，方向和靶材料的函数。该分布可以是非常定向的，这表明如果使用这种效果，可能会增加X射线管效率。这对于使用具有低输出通量的扫描电子束或碳纳米管的新型管是重要的。我们执行了Monte Carlo（MC）模拟，用于研究该角度分布如何受厚目标的相互作用的影响。使用4nm钨（W）球来验证单原子相互作用的理论分布。单独分析电子和X射线光子经过各种过程的贡献。计算通过正常和以放牧角度入射到4mm厚的目标的电子产生的X射线的角度分布。还模拟了12UxN传输目标的结果。对于单一相互作用，120KeV电子的理论峰值在28℃下测量为29°？对于MC模拟。与用于E> 30KeV的常规管相比，发现传输目标在向前方向上具有26％的X射线输出。当考虑每单位热量的X射线通量E> 30时，发现电子和相关的反射光束的放牧发生率比传统管更有效地为41％。

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