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The relationship between the characteristics of optically stimulated luminescence (OSL) and thermally stimulated luminescence (TSL) of dosimetric crystals based on nominally pure single-crystal, ion-defective corundum is considered. It is established that the TSL and OSL characteristics of these crystals are closely interrelated and are caused by the same active traps. It is shown that the OSL of deep traps has a form difficult to interpret, which can be due to the effect of both more shallow and deeper traps. Introduction.Optically stimulated luminescence (OSL) of the detectors of ionizing radiations (TLD-500) based on nominally pure single crystals of corundum with nonstoichiometric composition as to the oxygen sublattice (anion-defective corundum) has become an increasingly widespread method of registering ionizing radiations, whereas its physical and instrumental aspects are being actively investigated in the leading dosimetric laboratories of many countries [1, 2]. The basic advantage of the OSL-dosimetry over the traditional thermally stimulated luminescent (TSL) is the absence of heating and the associated problems of ensuring various and reproducible laws of raising the temperature and thermal quenching of luminescence that leads to the dependence of the TSL yield on the rate of heating of a detector [3,4]. The jist of the method of OSL is the optical ionization of the levels of capturing the charge carriers occupied during exposure to ionizing radiation and registration of the luminescence caused by recombination of released carriers at the luminescence centers. The OSL yield appears to be proportional to the absorbed radiation dose.The OSL and TSL properties of detectors based on anion-defective corundum crystals are closely interrelated, and therefore the mutual study of these properties is useful for developing the theory, technique, and practice of registration of radiations that use these phenomena.In [5], optically induced destruction of the thermal luminescence of a signal in dosimetric crystals of aniondefective corundum was investigated; however, the radiative channel of relaxation of the carriers released by light was not investigated.The present work is a continuation of the investigations carried out in [5] and is devoted to the study of the relationship between OSL and TSL in crystals of anion-defective corundum.Experimental. We used samples of standard TLD-500 detectors that were developed at the Ural State Technical University-UPI [6]; the equipment employed is of Russian production. OSL was measured by an FE ′ U-142 photoelectronic multiplier. To separate the stimulating light with the wavelength 470 nm from the luminescence in the 420-nm region a UFS-2 glass optical filter was installed between the sample and the photoreceiver.An SDK-S469-5-10 "superluminous" diode with a light strength from 3500 to 5000 mcd with a radiation wavelength of 470 nm and a halfwidth of about 10 nm was the source of optical stimulation. A continuous regime of stimulation at the selected geometry "in transmitte...