The process of radiation-chemical coloration of CsI(Tl) crystals with different carbonate ion contamination has been studied. The presence of carbonate in the CsI(Tl) crystals deteriorates their photo- and radiation stability. Possible reasons for the charge carrier derealization in CsI(Tl) crystals under exposure to daylight and a role of oxygen-containing impurities in the formation of stable radiation defects have been established. A model of the hole activator color center is suggested. According to the model, the Tl2+ vc - center is a Tl2+ hole activator center perturbed by a cation vacancy. The electron color centers Tl0va + are stabilized not only by the hole color centers of Tl2+ vc - and I 3 -, but also by the molecular anions of HCO 3 - and CO3 - formed as a result of the photo- and radio-chemical transformation of CO3 2- and OH- ions.
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Nuclear Energy and Engineering