Fast Neutron Albedo Calculations for a Concrete Shield with Different Curvatures

Abstract

A b s t r a c t . The 05R Monte Carlo neutron transport Code had been used to calculate tho neutron albedo for neutrons reflected from plane and curved concrete shields. The present calculations were performpd to investigate the fast-neutron albedo in case of ordinary concrete shield, in order to perform comparative studies with the case of neutron reflection aeainst a flat wall. The calculations were performed for three different neutron source energies of 1 MeV, 5 MeV and 15 MeV and a t neutron incident angles of 5", 30", 45", 60" and 90" and for surfaces with different curvatures (flat, 100, 50, 20 and 5 cm). The results obtained reveal that there will be an appreciable error on using the flat wall albedo value in the case of duct penetration calculations. The error was assumed to be due to the neglection of the curvature effect as well as to the improper choice of the neutron incident angle.