The mechanism of "internal" photoradiation effect in polymers with luminescent additives

The effect of intrinsic radiation-induced luminescence on the yield of trap ped radicals ("internal" photoradiation effect) in a series of polymers was studied. An original technical approach was applied. Polymeric light guide s containing various luminescent additives with the spectrum covering the r ange of 300-500 nm were used as concentrators of internal light. The change in the concentration of macroradicals was explained by the photoconversion of reactive intermediates resulting from the overlapping of the effective spectra of the radiation-induced luminescence of the matrix and absorption of reactive intermediates. As the absorbed dose increases, the effect is re duced because of quenching and reabsorption of the radiation-induced lumine scence by trapped radicals.