Abstract
A theoretical approach is proposed for describing the effect of the number and sequence of surface layers of different compositions on the distribution of radiation defects over the depth of the screened material. It is shown that the energy losses of fast protons penetrating through the tungsten-carbon media depend not only on the thickness and chemical composition of the media but also on the sequence and the number of the layers. Results of calculations using GEANT4 and SRIM programs agree well with each other and show that proton loses a larger amount of energy during the passage through the bilayer W/C target than through the C/W one. An increase in the number of layers leads to a decrease in the influence of the target structure on the distribution of the absorbed energy. This effect is explained by the difference in the stopping powers of neighboring layers.
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