Title :
Radiation stability of tungstate-based scintillators in radiometric control systems
Author :
Nagornaya, L.L. ; Vinograd, E.L. ; Tupitsina, I.A.
Author_Institution :
Inst. for Single Crystals, Acad. of Sci., Kharkov, Ukraine
fDate :
30 Oct-5 Nov 1994
Abstract :
The purpose of this paper is to study the effect of different preradiation defects (stoichiometric and impurity ones) on the processes of radiation damage and recovery of tungstate crystals. The investigation allowed to determine the factors which defined both the decrease and increase of the radiation stability of CdWO4 and other tungstate crystals. The optimal conditions for making the scintillators on the basis of cadmium tungstate, the radiation stability of which is 3 times higher than that of conventionally used at present in tomographs, were determined. The light output drift of tomographic elements did not exceed 0.1-0.5% after irradiation
Keywords :
X-ray effects; cadmium compounds; gamma-ray effects; radiometry; scintillation counters; tungsten compounds; CdWO4; impurity defects; light output drift; preradiation defects; radiation damage; radiation stability; radiometric control systems; stoichiometric defects; tomographic elements; tomographs; tungstate crystal recovery; tungstate-based scintillators; Absorption; Cadmium compounds; Control systems; Crystals; Electrical resistance measurement; Impurities; Radio control; Radiometry; Stability; Tomography;
Conference_Titel :
Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record
Conference_Location :
Norfolk, VA
Print_ISBN :
0-7803-2544-3
DOI :
10.1109/NSSMIC.1994.474386
