Monte Carlo Calculation of Transport of Fast Electrons

Abstract

Transmission, backscattering, and spatial distribution of ionization energy loss of electrons in thick absorbers have been calculated by a random-sampling method by use of an IBM-7090 digital computer. Results are presented for 0.4-4.0 Mev electrons normally incident on C, Al, and Cu absorbers. Ratios of extrapolated range of monoenergetic electrons to total range at incident energy were found to vary from 50 to 90%, to depend only weakly on incident energy, and to decrease markedly with increasing atomic number of absorber. Back-scattering coefficients were found to decrease with increasing energy in this range, and are in agreement with the recent experimental data of Frank; values of (4.2\ifmmode\pm\else\textpm\fi{}0.9)% and (16.6\ifmmode\pm\else\textpm\fi{}1.8)% were obtained for 2-Mev electrons incident on Al and Cu.