Procedure for calculating the radiation stopping power for electrons

A procedure is described for calculating the radiation stopping power for electrons, i.e. the mean energy loss per unit path length due to the emission of bremsstrahlung photons. For bremsstrahlung in the field of the atomic nucleus, the cross sections used are those of Pratt and collaborators at low and intermediate energies, and those of Davies, Bethe, Maximon and Olsen at high energies. For bremsstrahlung in the field of the atomic electrons, the cross section of Haug is used. The radiation stopping powers in the energy region from 1 kev to 10 GeV have been fitted by a 9-parameter approximation formula. These parameters depend on the atomic number Z , and are given for all Z from 1 to 100.

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