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A Benchmark Gamma-Ray Skyshine Experiment

R. R. Nason, J. K. Shultis, R. E. Faw, C. E. Clifford

Nuclear Science and Engineering

Volume 79 / Number 4 / December 1981 / Pages 404-416


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A benchmark gamma-ray skyshine experiment is described in which 60Co sources were either collimated into an upward 150-deg conical beam or shielded vertically by two different thicknesses of concrete. A NaI(Tl) spectrometer and a high pressure ion chamber were used to measure, respectively, the energy spectrum and the 4π-exposure rate of the air-reflected gamma photons up to 700 m from the source. Analyses of the data and comparison to DOT discrete ordinates calculations are presented.

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