The absorbed dose in the vicinity of an interface between two media irradiated by a60Co source

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Abstract
Monte Carlo techniques are used to generate the distribution of absorbed dose in the vicinity of an interface between 2 media. Computer-generated distributions for absorbers comprising the media C-Cu, H2O-Al and Al-H2O are presented. The distribution features in regions of electron equilibrium and nonequilibrium, in particular finite discontinuities at the boundaries and subsequent build up or build down, are qualitatively and quantitatively discussed. The difficulties inherent in interpreting ionization measurements in the interface areas are outlined.