A dependence of the temperature for the current maximum of thermally-stimulated-current (TSC) curves on storage time between electron injection and TSC experiment has been observed for 25-μm Teflon electrets. The currents were measured with contacting electrodes on samples charged with 20-keV electrons. Typical peak temperatures are 40 and 100°C for storage times of ${10}^3$ and ${10}^8$ sec at room temperature, respectively. The peak shifts are explained by the time dependence of the radiation-induced conductivity generated during electron injection.

• Received 17 June 1974

DOI:https://doi.org/10.1103/PhysRevB.10.4488