Thermoluminescence and Reactions of Freed Interstitial and Trapped-Hole Centers in KBr Crystals below Room Temperature

抄録

Thermoluminescence mechanism has been studied from the view-point of clarifying kind of reactions of radiation-induced defects responsible for the emission in KBr crystals irradiated at 77 K. The dependence of glow curves on the kind of alkali impurity and on Na⁺ concentration, and the response of glow peaks to the F-light illumination were studied. Correlations between glow peaks and reactions of color centers were made clear as follows. The recombination between neutral Frenkel pairs, Br_i⁰+F, is assigned as the main origin of thermoluminescences in non-activated specimens. Annihilation of the V_K center due to the thermal migration of the hole and to the reaction of freed Br_i⁻ are also found to be responsible for the emission.