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The thermoluminescence glow curve of γ-irradiated silica gel investigated between 77 °K and 600 °K is a broad band extending from 80 °K to ~ 400 °к. The emission occurs at ~ 450 nm. Shallow traps (0.1 - 0.2 eV) are responsible for most of the light emitted. The distribution of trap depth and the increase of trap density toward the band edge is tentatively attributed to the dis-ordered structure of silica gel in accordance with previous suggestions concerning glasses. In contrast to the growth with radiation dose of color-and paramagnetic center concentration, luminescence is already saturated at about 1 Mrad. The luminescence decay follows the hyperbolic relation derived by Adirowich for a bimolecular process in the case of retrapping for which evidence is presented. At very low radiation doses the initial intensity of luminescence was proportional to the square of the dose rate as expected for a bimolecular reaction.

Gamma-Ray Induced Luminescence of Silica Gel: I. Thermoluminescence and the Effect of Adsorbed Molecules