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Multiple scattering in the Compton effect. III. Monte Carlo calculations

1976; American Institute of Physics; Volume: 14; Issue: 1 Linguagem: Inglês

10.1103/physreva.14.328

0556-2791

Anthony C. Tanner, Irving R. Epstein,

Radiation Shielding Materials Analysis

Total probabilities, angular distributions, and energy profiles of multiply scattered radiation are calculated using Monte Carlo techniques. It is found that use of either the Klein-Nishina or the polarization-dependent Thomson cross section can result in significant departures from the angular distributions and energy profiles obtained with the polarization-averaged Thomson cross section. The radius of the incident photon beam appears to have a substantial influence on multiple scattering probabilities and angular distributions for finite cylindrical samples. Criteria are established for estimating under what experimental conditions a sample may be considered effectively "infinite," so that earlier analytic results become applicable. Triple and higher-order scattering are found to be generally insignificant for finite cylinders.