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Information × Registration Number 0222U001405, 0119U002544 , R & D reports Title Research and development of scintillation crystals for low-background nuclear spectrometry. popup.stage_title Head Grynoyv Borys V., Доктор технічних наук Registration Date 26-01-2022 Organization V.N. Karazin Kharkiv National University popup.description2  Low-background single crystals of archPbWO4 and ZnxMg1-xWO4 solid solutions, lithium molybdate (Li2MoO4), ZnSe(Al), ZnSe(Te), ZnTe crystals of chalcogenides and ZnSe1-xSx solid solutions are obtained. The promising of their application in nuclear spectrometry are shown. Low-background lead tungstate single crystals with improved optical parameters were obtained by minimizing deviations from the stoichiometric composition during the growing process and using the double crystallization method. Comprehensive experimental and computer studies of the electronic structure have revealed the mechanisms of luminescence in Li2MoO4 crystals. According to X-ray diffraction analysis, it was found that in ZnxMg1-xWO4 crystals the volume of the unit cell of the crystal lattice increases with increasing concentration of zinc atoms. It is shown that W atoms are in distorted oxygen octahedra. In the luminescence spectra of ZnxMg1-xWO4, one broad band associated with the radiative decay of excitons self-trapped on the WO66- complexes was detected. The phonon thermal conductivity of ZnSe was measured and the light output and kinetics of X-ray luminescence as a function of temperature in the range T = 5 ÷ 295 K were studied. It was found that at room temperature there is a significant thermal quenching of ZnTe luminescence, while when the temperature is reduced to T  150 K there is an increase in scintillation efficiency. It is shown that all samples of the obtained mixed ZnSe1-xSx crystals were homogeneous and had a sphalerite lattice. It was found that the relative light output of the crystals increases with increasing sulfur content and at x = 0.3 reaches the light output of the ZnSe (Te) scintillator. The obtained results indicate that scintillators based on архPbWO4, Li2MoO4, ZnxMg1-xWO4, ZnSe, ZnTe and ZnSe1-xSx are promising for use in cryogenic scintillation detectors Product Description popup.authors Bohdanov Valerii V. Boiko Yurii I. Hrynov Borys V. Dubovik Oleksander M. Korshak Vira F. Rybalka Iryna A. Tupitsyna Іryna А. Yakubovska Ganna G. popup.nrat_date 2022-03-09 Close