Abstract
Abstract : Monte Carlo calculations were carried out in great detail on the reflection properties of concrete for fast neutrons. The results are presented for the differential angular dose albedo for various incident-beam conditions and touches upon some of the other distributions calculated. The following formula represents the calculated differential angular dose albedo to better than 10% for about 95% of the values obtained and can be used to extend the results to the entire hemispherical range for both incident and reflected neutron velocity vectors. A comparison of the fast-neutron angular dose albedo calculations weighted by an incident spectrum previously measured at the Tower Shielding Facility with the results of a series of dose albedo measurements performed at the TSF shows a root mean square deviation from 147 combinations of the incident and reflected angles of 3.1%, with the largest single deviation being 9%. This excellent agreement shows that existing cross sections are adequate to calculate differential albedos to a high precision.
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