Gres V. Surface processes leading to spectrometric characteristics' degradation of NaI(Tl) and CsI(Na) scintillators

The object of investigations: NaI(Tl) and CsI(Na) scintillation crystals. The aim of investigations: to investigate spectrometric characteristics' degradation of NaI(Tl) and CsI(Na) in connection with running physical-chemical processes near their surfaces. The methods of investigations: optical and electron microscopy, X-ray- phase and structure analyses, X-ray-photoelectron spectroscopy, luminescence and scintillation measurements. Theoretical and practical results, newness: on the basis of luminescence spectrum changes the method of working capacity control during the detector operation was proposed. The method of manufacturing a detector with the effective diffusion reflector was proposed. For CsI(Na) crystals the increase of scintillation efficiency near their surface just after polishing was found. Shortening of the scintillation duration for low-energy quanta was revealed. The way to solve the problem of limitation of the internal energy resolution was proposed. The degree of inculcation: methodof working capacity control during the detector operation which used in experienced manufacture of STC Institute for Single Crystals. Field of application: scintillation technics, radiation material science, surface crystals' physics.