Abstract Experimental results of influence of intensity and fluence of electrons, protons, and combined action of space environmental factors (vacuum, electrons, protons and electromagnetic radiation) on mass loss of a model polymeric composite are presented. Existence of threshold levels both for fluencies of electrons and protons at flux density of 1011 cm−2 s−1 and at flux densities of these particles corresponding to 1015 and 5 × 1014 cm−2 at fixed fluencies was established and a threshold level for combined action of protons and electrons was determined. It was shown that excess of threshold radiation modes makes a thermally stimulated mass loss of irradiated samples to reduce as compared with the source material.


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