Funct. Mater. 2020; 27 (2): 258-263.
Radiation stability of co-doped NaI:Tl scintillators
Institute for Scintillation Materials, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
It is shown that there are potential hidden mechanisms that can deteriorate the radiation stability of NaI(Tl) scintillators. It turned out that the formation of intrinsic hole centers upon irradiation is not the main reason for the decrease in scintillation yield, but their role increases in case of codoping. The determining process is the capture of carriers directly by thallium ions with the conversion of Tl+ to Tl2+. As a result, a positive effect of codoping can be achieved only with a strictly specified balance between these mechanisms.
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