The experimental investigation results of different kinds of ionizing radiation's (gamma- quanta, electrons, protons, neutrons, neon ions) influence on the optical, electrophysical, structural properties of gadolinium gallium garnet (GGG) crystals are presented. Some crystal parameters have been obtained using the quantum-chemical calculations. With regard to this result the radiation damage concentrations have been calculated. For most likely defect configurations the defect level energies and optical transition probabilities have been determined by means of Green function method. The mechanisms of radiation-induced transformations and color center models are discussed.
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