The formation of free radicals in polymers exposed to the simultaneous action of γ-radiation and light has been studied by Russian scientists1134, 1486, 1488, 1489, 1771, 2487). The interpretation of ESR spectra to determine the radicals formed in these conditions is complicated, on account of the simultaneous reactions of the formation and transformation of radicals. For that reason, we prefer
... [Show full abstract] to give in this chapter separate descriptions of ESR studies of free radicals formed in vacuum by ionizing and light irradiation respectively. The oxidation processes of free radicals formed during the degradation in the presence of air (oxygen) will be discussed separately in Chapter 7.