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Information × Registration Number 0224U002941, 0123U102240 , R & D reports Title Studying the impact on environment of technological processes at modernized sites for growing single crystals of alkali metal iodides. popup.stage_title Head Boiaryntsev Andrii Yu., Доктор технічних наук Registration Date 18-03-2024 Organization Institute for scintillation materials NAS Ukraine popup.description2 The removal of the grown single crystal from the growth setup and its annealing in the thermos were stated to be the most dangerous operations (from the viewpoint of the ecology) at the growth of large-size scintillation single crystals on the basis of sodium and cesium iodides. The thermodynamic parameters of NaI and CsI oxidation processes course at elevated temperatures were calculated. New routines of the growth of iodide scintillation single crystals were developed and fine tuned permitting to increase the level of ecological safety. The decrease of temperature in the growth setup by 100 °C was found to decrease the intensity of evaporation of the crystal constituents at the removal of the crystal from the growth setup. The thermal conditions of the crystal annealing were determined in order to minimize the emission of toxic substances in the environment. The temperature distribution in the used thermoses was investigated to determine overcooling and overheating zones. The obtained information gave the possibility to modernize the packing between the frame and the cover of the thermoses and to perform re-mounting the heaters of the thermoses to level the temperature distribution. This allowed to decrease the vapor and aerosol emission from the thermos by 5 times. The routines of the crystal annealing permitting to increase the level of ecological safety at the maintaining the crystal quality were developed. On the basis of the obtained results the changes to the existing technological documentation on the growth and after-growth treatment of the large-size scintillation single crystals were proposed. The fulfilling of the project gave the possibility to essentially decrease the intensity of possible emission of toxic substances in the environment. Product Description popup.authors Boiaryntsev Andrii Yu. Kolesnikov Oleksandr V. Sibilieva Tetiana H. Cherginets Viktor L. popup.nrat_date 2024-03-18 Close