Accession Number : AD0615598

Title :   DIFFERENTIAL DOSE ALBEDOS FOR CALCULATION OF GAMMA-RAY REFLECTION FROM CONCRETE,

Corporate Author : RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX

Personal Author(s) : Wells,M. B.

Report Date : 30 DEC 1964

Pagination or Media Count : 55

Abstract : Differential dose albedos for gamma ray reflection from concrete were derived from Monte Carlo calculations of gamma ray scattering in air and concrete for source energies of 0.6, 1, 2, 4, and 7 Mev. Curves showing the albedo for reflection in the plane of incidence are presented for given angles of incidence. At incident energies greater than 2 Mev the computed dose albedos are smaller than those reported by Raso (also based on Monte Carlo) and those given by the Chilton-Huddleston formula. However, comparisons with experimental data for Cs137 and Co60 gamma rays reported by Jones, Schofield, Haggmark, and Gurney of USNRDL, C. E. Clifford of DRCL, and Barrett and Waldman of Technical Operations, Inc., indicate that the calculated albedos for these sources agree as well with the experimental data as do calculations based either on the Chilton-Huddleston formula or Raso's Monte Carlo calculations. (Author)

Descriptors :   (*CONCRETE, GAMMA RAY SCATTERING), (*GAMMA RAY SCATTERING, CONCRETE), ALBEDO, GAMMA RAYS, DOSE RATE, MONTE CARLO METHOD

Distribution Statement : APPROVED FOR PUBLIC RELEASE