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I present the energy spectra and angular distribution of backscattered electrons and positrons from thick targets for Li, Be, Al, Fe, Cu, and Sn for 1.0 MeV particles; and for Be and Sn for 0.5 MeV and 2.0 MeV particles normally incident on the targets. These spectra have been calculated by a random-sampling ~lonte Carlo program on a CDC 6600 digital computer. Backscattering coefficients are found to. fit a IZ-dependence for Z > 13. The shape:; of the energy spectra depend strongly on the atomic number Z and are found to be in good agreement with experimental data. The angular distribution fits -(rr-a) 2/2 a cos(rr-a)oe . -dependence .. The energy spectra, angular distributions,and backscattering coefficients depend on the angle 13 between the initial beam and the target surface. For decreasing angles 13, the most probable energy shifts toward the initial energy. -1UCRL-19719 ·

ENERGY SPECTRA OF BACKSCATTERED ELECTRONS AND POSITRONS BY MONTE CARLO CALCULATIONS.