White D R
Phys Med Biol. 1977 Mar;22(2):219-28. doi: 10.1088/0031-9155/22/2/003.
A comprehensive analysis has been completed of the dependence of photon and electron interactions upon atomic number. The calculations were specifically biased towards the application of the data to biological tissues and their substitutes. The photon interactions considered in the survey included all the partial attenuation and energy absorption cross-sections. The electron interactions analysed were collision and radiation stopping powers and angular scattering powers. The derived Z-exponents are tabulated for different energies and elemental groupings and indicate the inadequacy of existing Z-exponents. In particular, the continued use of the single exponent 3.94 for photoelectric attenuation (per atom) is put in question.
已完成对光子和电子相互作用对原子序数依赖性的全面分析。这些计算特别偏向于将数据应用于生物组织及其替代物。调查中考虑的光子相互作用包括所有部分衰减和能量吸收截面。分析的电子相互作用是碰撞和辐射阻止本领以及角散射本领。针对不同能量和元素分组列出了推导得到的Z指数，表明现有Z指数并不充分。特别是，对光电衰减（每个原子）持续使用单一指数3.94受到了质疑。
