In food irradiation, the medium in a food product package is usually discontinuous, however in most of estimation of dose profiles, it is considered as continuous material. In the present work, investigation of the depth-dose profiles of electron radiation induced by 10 MeV electron beam linear accelerator (UELR-10-15S2) in continuous and discontinuous materials has been performed based on Monte Carlo simulations and experiments. Three materials were chosen such as water (density of 1.0 g/cm3), plastic (1.05 g/cm3) and food-like dummy (1.0 g/cm3) in Monte Carlo simulations using MCNP4c code and the experiments. In the discontinuous mediums, the materials were separated into layers with the thickness of 0.2-0.4 cm by air gaps, but the total thickness of the material mediums are kept the same. The thickness of the air gaps was increased from 1.0 to 4.0 cm. The results show no significant difference of the depth-dose profiles in the continuous and discontinuous materials. The difference of practical range, i.e. the depth of electron radiation, in continuous and discontinuous mediums is within 5% for the same materials. The results are similar with the three materials, and an agreement between simulations and experiments are obtained. The practical range in plastic is 5.23 g/cm2, which is greater than that in water (5.02 g/cm2) and food-like dummy (4.94 g/cm2). This indicates that for plastic products irradiated by the double-sided electron beam, it is possible to use a thicker package of 9.6 g/cm2 compared to the usual thickness of 8.8 g/cm2.
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