TSC studies of carrier trapping in electron- and γ-irradiated Teflon

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Abstract
A study of thermally stimulated current (TSC) spectra of 25‐μm Teflon samples preirradiated with 40–75‐keV electron beams or 60Co γ rays is presented. The currents, obtained under an applied or an internal field, are generally due to a superposition of drifts of primary injected and secondary radiation‐generated carriers. The TSC spectra are identical for both kinds of irradiation if comparable dose rate and total dose are used and if no excess charge is present. In general, two current peaks at about 70 and 200 °C, respectively, are observed. The low‐temperature peak is sensitive to storage conditions; it furthermore saturates with applied field and increases with radiation dose. The high‐temperature peak shows no significant dependence on storage conditions, and does not saturate as easily with applied field, but tends toward earlier dose saturation.