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首页> 外文会议>Conference on Medical Imaging 2008: Physics of Medical Imaging; 20080218-21; San Diego,CA(US) >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ms致辐射X射线发射的角度依赖性

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摘要

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：来自高能电子与目标原子的单次相互作用的x射线的角概率分布是入射电子能量，方向和目标材料的函数。这种分布可能是有方向性的，这表明如果使用此效果，X射线管的效率可能会提高。对于使用扫描电子束或具有低输出通量的碳纳米管的新型管而言，这可能很重要。我们进行了蒙特卡洛（MC）仿真，以研究该角度分布如何受厚目标中的相互作用影响。使用4nm钨（W）球验证了单原子相互作用的理论分布。分别分析了电子和X射线光子所经历的各种过程的贡献。计算了由正常入射的电子和以掠角入射到4mm厚目标的电子所产生的x射线的角度分布。还模拟了12uxn传输目标的结果。对于单次相互作用，在MC模拟中测得的120keV电子在28？处的理论峰为29?。已发现与E> 30keV的传统电子管相比，透射目标的正向X射线输出高出26％。当将每单位热量的X射线通量考虑为E> 30时，发现电子的掠入射和相关的反射束比常规管的效率高41％。

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