Differential Neutron and Secondary Gamma-Ray Albedos for Steel-Covered Concrete Slabs: Volume I. Description of Calculations and Comparisons with Other Data

摘要

Calculations were performed with the two-dimensional Sn procedure DOT to determine the distribution in energy and angle of the neutrons and secondary gamma rays reflected from steel-covered concrete slabs for 27 incident neutron energy intervals ranging from 14.918 MeV to 2.53 x 10 to the -8th power MeV and for 5 incident directions. The doubly-differential neutron current albedo was computed for 30 emergent directions and for each of the 27 energy intervals lying between and including the incident energy interval and 2.53 x 10 to the -8th power MeV. The secondary gamma-ray doubly-differential current albedo was computed for the same parameters as those used to define the neutron albedo except that 13 energy intervals between 10.0 MeV and 0.01 MeV were used to define the reflected secondary gamma-ray energy distribution. The neutron and secondary gamma-ray double-differential current albedos were converted to number albedos, differential current-and flux-dose albedos, and current-and flux-dose albedos. These data are compared with albedo data reported by other investigators for iron slabs and concrete slabs. (Author)