McCall R C, McIntyre R D, Turnbull W G
Med Phys. 1978 Nov-Dec;5(6):518-24. doi: 10.1118/1.594487.
A semiempirical analytic description of the accelerator depth-dose curve is described along with its physical explanation. The results of Monte Carlo calculations are presented and compared with experimental data to test this model. Calculations were made for different atomic number (Z) materials used as x-ray targets and flatteners, with the results showing that medium-Z materials are the logical choice. It is demonstrated empirically that Dmax is a simple function of the average energy (E) of the x-ray spectrum. The variation of E with Z of the target and flattener is demonstrated. As a practical example, Monte Carlo calculations and experimental data for old and new Clinac 35 accelerators are presented.
本文描述了加速器深度剂量曲线的半经验分析描述及其物理解释。给出了蒙特卡罗计算结果，并与实验数据进行比较以检验该模型。针对用作X射线靶和均整器的不同原子序数（Z）材料进行了计算，结果表明中等Z材料是合理选择。通过经验证明，Dmax是X射线能谱平均能量（E）的简单函数。展示了E随靶材和均整器Z值的变化。作为一个实际例子，给出了旧的和新的Clinac 35加速器的蒙特卡罗计算结果和实验数据。
