γ-Irradiation effect on TSC from polyester films

Abstract

TSC spectra of the thermo-relaxation of frozen-in dipoles and space charges from PET irradiated by 60CO have been investigated. The total dose ranged over Mrad at dose rates from 10 to 850 rad/sec. It was observed the current peaks of space charges undergo a max value with increasing of irradiation doses, and finally tend almost to a constant at various dose rates. Authors suppose two processes, namely, the excitation new carrier by ionization irradiation and annihilation electrons by oxygen diffusion, are presented, This can be used as a method for distinguishing main species of carrier in polymer-electrects.