PRELIMINARY RESULTS OF COMBINED THERMO-LUMINESCENCE AND THERMALLY STIMULATED CURRENT MEASUREMENTS ON AN ADDITIVE FREE POLYETHYLENE

摘要

Samples of additive free low density polyethylene have been irradiated at -180 and -130℃ with 1 keV electrons. The sample arrangement was such that simultaneous measurements of thermally stimulated discharge currents (TSDC) and luminescence (TL) were possible and these techniques were used to observe effects of surface charge relaxation. The resulting spectra were similar in some respects to those obtained by other workers using either higher electron energies, which create bulk charges, and higher irradiation temperatures, or using X- or γ-radiation to create internal charge. In particular some of the TL peaks in the spectra obtained by the present authors were observed in similar regions and a current reversal seen in the TSDC spectrum obtained at the higher irradiation temperature (-130℃) was also observed by another worker but for material irradiated at above room temperature. The current reversal is most likely to be associated with charge movement in the bulk rather than across the sample surface.