Recombination Luminescence in γ-Irradiated 3-Methylpentane Glass at 77°K

Abstract

Thermoluminescence from γ-irradiated 3-methylpentane at 77°K has been studied. Two kinds of emission spectra are observed in the visible region according to temperature. The one has its maximum intensity at 425 nm and is observed in the temperature range of 77°∼83°K (Spectrum I), the other its maximum at 530 nm, appearing at 83°∼90°K (Spectrum II). The effects brought upon the integrated luminescence intensity by differences in radiation dose, by IR and UV bleaching, by the addition of electron or hole scavengers, and by standing in dark were examined, and the results are compared with those obtained from optical absorption in the IR and UV regions under various experimental conditions. The results suggest that the spectrum I is caused by the recombination of positive holes with electrons released by the warming, while the spectrum II would appear attributable the recombination of positive holes with some anionic species produced by the reaction of electrons with radicals.