Registration Number
0223U001052,
0121U111999
, R & D reports
Title
Development of composite scintillators based on ZnWO4: Me + for modern detectors of ionizing radiation.
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Head
Tinkova Vira S., Кандидат технічних наук
Registration Date
24-01-2023
Organization
Institute for scintillation materials NAS Ukraine
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The possibility of obtaining scintillation ZnWO4 micropowders with improved functional characteristics by methods of solid-phase synthesis and cationic doping was investigated in the work. The sulfates and nitrates of alkaline earth metals were used as dopants. The effect of anionic and cationic parts of the added salts on the morphology and scintillation parameters of the synthesized powders and their dependence on concentration was studied. It is shown that the anionic part of the added salt has almost no effect on the grain size of the synthesized powders, while the introduction of Cs+ and Rb+ cations into the ZnWO4 crystal lattice leads to increase in grains relative to Li+ in 5 times.
The study of the X-ray luminescence spectra of the obtained powders showed their similarity to the spectra of the ZnWO4 single crystal. The maximum luminescence intensity was observed for ZnWO4:Cs+ and ZnWO4:Rb+ samples.
The optimal conditions of scintillation micropowder ZnWO4:Me+ synthesis with improved functional characteristics were established: 0.01 mol.% Rb+, T = 950 ˚С, t = 30 h. The composite sample based on such a powder demonstrates the value of the light output at the level of the composite of crushed ZnWO4 single crystal and the level of afterglow in the millisecond range is an order of magnitude lower than that of the bulk single crystal (0.042 after 3 ms and 0.021 after 20 ms).
The dependence of the scintillation parameters of ZnWO4:Me+ powders on the dopants concentration in the range of 0.001 - 0.02 mol.% was studied. The best values of light output and afterglow level are observed at the concentration of 0.01 mol.% Rb+ and 0.003 mol. % Cs+.
Technological approaches of composite scintillators production based on synthesized micropowders ZnWО4:Me+ have been developed. It is shown that the sample based on 50 wt.% content of filler (unfractionated synthesized powder) has the highest value of light output.
Product Description
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Sidelnikova Lidia Yu.
Tinkova Vira S.
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2023-01-25
