On the nature of defects responsible for thermal expansion of irradiated alkali halide crystals

To determine defect nature responsible for thermal expansion of irradiated AHC, effect of electron excitation on variation of linear expansion temperature coefficient and on accumulation of F-, X3--centers, devacancies in KBr crystals in the absorbed dose range of 3x104-5x108 rad has been studied. Specimen irradiation was performed with 1.2 MeV electrons at room temperature. Divacancies are shown to play a determining role in the process of AHC radiation expansion