Abstract
This review discusses gamma-ray penetration through matter, particularly the differential, angular and energy spectra which have been reported. Experimental spectra are obtained by unfolding measured data and the features of unfolding methods and codes are discussed. A large proportion of the published data is for point and parallel beam sources of gamma radiation from the decay of the isotopes 137Cs and 60Co. Data for higher energy sources show the importance of secondary radiations of Bremsstrahlung and positron annihilation photons in shield penetrations. Reasons why it is difficult to make direct comparisons of reported data are outlined. The need for benchmarking methodology is emphasized.
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