Data for: Photon transport physics in Serpent 2 Monte Carlo code

Fit coefficients for calculating the maximum value of the differential energy cross section of electron-positron pair production. Usage of the coefficients is described in the associated article.用于计算正负电子对产生（electron-positron pair production）过程的微分能量截面（differential energy cross section）最大值的拟合系数。此类系数的使用方法详见相关研究文献。