Radiation damage is a key challenge for materials. Accurate evaluation of radiation damage is a starting point for investigating the behaviors of materials used in a radiation environment. The present work proposes improved methods for calculating the primary radiation damage cross sections induced by light particles, including electrons, positrons, and photons. The main improvements compared with previous methods are: (1) accurate Mott cross section rather than the McKinley-Feshbach analytical approach is used for electron and positron scattering; (2) data and methods recommended by the International Commission on Radiation Unit and measurements (ICRU) are systematically applied for computing the stopping powers of electron and positron; (3) accurate differential cross section by combining different models instead of some simple approaches is used for pair production. The electron, positron, and photon irradiation-induced displacement cross sections for various important elements covering a large range of atomic numbers (from Li to U) are computed with the improved methods for energy up to 100 MeV. The calculated displacement cross sections are also tabulated so that they can be simply used for further applications.

辐射损伤是材料面临的主要挑战。辐射损伤的准确评估是研究辐射环境中使用的材料行为的起点。目前的工作提出了用于计算由光粒子（包括电子、正电子和光子）引起的初级辐射损伤截面的改进方法。与以往方法相比的主要改进是：（1）使用精确的莫特截面而不是麦金利-费什巴赫分析方法来进行电子和正电子散射；(2)系统地应用国际辐射单位与测量委员会(ICRU)推荐的数据和方法计算电子和正电子的阻止本领；(3) 通过组合不同的模型而不是一些简单的方法来获得精确的微分截面用于对生产。涵盖大范围原子序数（从 Li 到 U）的各种重要元素的电子、正电子和光子辐照引起的位移截面是使用改进的方法计算的，能量高达 100 MeV。计算出的位移横截面也被制成表格，以便它们可以简单地用于进一步的应用。