Abstract
The aim of this study is to compare point isotropic buildup factors recently calculated by Sn discrete ordinate codes with those obtained by the EGS4 Monte Carlo code and those of the standard data (ANS-6.4.3-1991). The comparisons are presented for the water, iron, and lead exposure buildup factors, for 3 energies of 10, 1, and 0.1 MeV, and for total thicknesses of up to 30 mfp mean free paths. The comparisons have shown that the buildup factors calculated by the Sn and EGS4 codes are in very good agreement. The maximum deviations observed between the results given by these codes are about 10% for all cases. The deviations between the Sn and EGS4 codes on the one hand, and the standard data on the other hand, are about 35% and 20% for the lead exposure buildup factors at 10 MeV and 0.1 MeV respectively. In the second part of the study we show the impact of both coherent and incoherent scattering on the exposure and the exposure buildup factors. These effects are important for the energy range below 1 MeV and must not be neglected in the transport calculations.
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