The stress-strain state of deformed NaCI type single crystals with the sample height smaller than the base side

A real modelling of the mass transfer process in a crystal by visualization of the crystal material motion under deformatioin using markers as well as structure studied have revealed inhomogeneity in the stress fields and in the crystal dislocation structure. Four crystal regions have been distinguished differing in the dislocation structures and the dislocation interaction mechanisms. For each region, the structure evolution has been studied and the structure state diagram has been constructed as a function of the prestrainin rate

Scintillation characteristics of deformed large-sized NaI crystals

The effect of plastic deformation on defect structure and functional parameters of NaI based crystals and scintillator NaI(Tl) in particular has been studied. Plastic flow modeling in decorated samples as well as in large size crystal blanks demonstrated significant non uniformity of the deformation map along the sample. Scintillation parameters (light output and energy resolution) are practically the same through the whole crystal volume. Post deformation scintillation parameters are similar to the single crystal ones. This phenomenon is typical for the wide range of temperature and deformation rates for this type of crystals