The significance of electron binding corrections in Monte Carlo photon transport calculations.
The significance of electron binding corrections in Monte Carlo photon transport calculations.
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蒙特卡罗光子输运计算中电子结合校正的重要性。
DOI：
10.1088/0031-9155/29/9/003
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发表时间：
1984
影响因子：
3.5
通讯作者：
Morin,RL
中科院分区：
文献类型：
--
作者：
Williamson,JF;Deibel,FC;Morin,RL
许多蒙特卡罗模拟忽略相干散射事件，并利用克莱因-西名自由电子分布，而不是非相干微分截面，选择非相干散射光子的轨迹。作者评估该模型的准确性，通过比较其结果与完整的束缚电子模型（形状因子的方法），它模拟相干散射事件，并使用适当的束缚电子角散射分布。分析和Monte Carlo计算表明，使用的自由电子散射分布显着低估了散射光子能量的角分布所造成的低和中等能量的光子入射在碳，铁和铂的障碍。在使用自由电子近似计算势垒传输，显着的错误只发生在初级光子能量低于100千电子伏。完全束缚电子模型的实现使作者的蒙特卡罗程序的计算效率仅降低了10- 25%。
Many Monte Carlo simulations ignore coherent scattering events and utilise the Klein-Nishina free electron distribution, rather than the incoherent differential cross-section, for choosing the trajectories of incoherently scattered photons. The authors assess the accuracy of this model by comparing its results with those of the complete bound electron model (form factor approach), which simulates coherent scattering events, and uses the appropriate bound electron angular scattering distributions. Both analytic and Monte Carlo calculations demonstrate that use of the free electron scattering distributions significantly underestimates the angular distribution of scattered photon energy resulting from low and medium energy photons incident upon carbon, iron, and platinum barriers. In using the free electron approximations to calculate barrier transmission, significant errors occur only for primary photon energies below 100 keV. Implementation of the complete bound electron model reduces the computational efficiency of the authors' Monte Carlo code by only 10-25%.