Accession Number : AD0716320

Title :   Backscattering for Gamma Rays from a Point Source Near a Concrete Plane Surface,

Corporate Author : ILLINOIS UNIV URBANA ENGINEERING EXPERIMENT STATION

Personal Author(s) : Chilton,Arthur B.

Report Date : 1964

Pagination or Media Count : 95

Abstract : Backscattering factors, as fractions of a direct dose rate in a vacuum, are obtained for point sources of gamma radiation, specifically cesium-137 and cobalt-60, placed near a plane interface between vacuum and concrete. The method derived is based on application of albedo principles, using the Chilton-Huddleston formulation for albedo. Previously published values of parameters for the Chilton-Huddleston formula are not used; but a new set, believed to be better, is derived. The results are considered practically applicable to air-concrete or air-ground interface situations, provided the distances of source to detector, source to interface, and detector to interface are greater than a mean-free-path of the source gamma radiation in the concrete or ground but substantially less than that in air. (Author)

Descriptors :   (*GAMMA RAY SCATTERING, CONCRETE), (*SHIELDING, GAMMA RAYS), BACKSCATTERING, ALBEDO, DOSE RATE, COBALT, CESIUM, COMPUTER PROGRAMS, GAMMA PROTON REACTIONS, GAMMA RAY CROSS SECTIONS, MONTE CARLO METHOD

Subject Categories : Nuclear Radiation Shield, Protection & Safety
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE