The time dependence of the polarization and depolarization current densities, the effective electric field in the electret chamber, and the electret surface charge densities are presented for the radiation-induced foil electret. With the use of the hyperbolic dependence of the ionization-chamber current density on the effective electric field, one obtains excellent agreement between calculated and measured electret polarization and depolarization current densities.

• Received 22 October 1982

DOI:https://doi.org/10.1103/PhysRevB.27.5062