Radiation hardening and pressure-actuated charge release of electron-irradiated Teflon electrets

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Abstract
The radiation‐induced conductivity (RIC) of Teflon is greatly reduced after bombardment with massive doses of the order of 100 Mrad. Such a ``radiation‐hardened'' Teflon film can store a considerably larger amount of negative charge in vacuum than nonhardened Teflon films. The stored charge is, however, released within a short time when the dielectric is brought up to air pressure. This charge release occurs partly as disruptive internal discharge at pressures below 1 Torr and partly as continuous charge release at higher pressures.