Energy loss and dielectric properties of γ-irradiated PMMA thin film

Abstract

The energy loss and dielectric properties of a polymer polymethylmethacrylate (PMMA) films was studied. The PMMA films were irradiated at a dose 8.5 kGy using the Co-60 source. The energy loss and dielectric properties of polymer films both before and after irradiation at room temperature have been studied. The dielectric constant of films after irradiation is found to be increased after irradiation this increase in the dielectric constant is mainly attributed to the creation of radiation induced charges in the film and the dielectric loss of the PMMA film is found to be decreased after gamma irradiation. The ac conductivity of PMMA films is found to increased after irradiation. The impedance of a PMMA is found to be decreased exponentially at lower frequency region and then it remained constant as the frequency increased. The impedance of the films increased after irradiation. The energy loss of α-particles with PMMA thin film at different pressures both before and after irradiation is found to be decreased with increase in the scattering chamber's pressure.