Zaslavskiy B. Technological foundations of growing of alkali halide scintillation single crystals from the melts with changing geometry of the free surface.

Research subject: Physical and chemical processes of a new method of growing of the large alkali halide scintillation crystals. Research goal: To develop the principles and technological foundations, new highly efficient technological processes and the required equipment for growing the large scintillation crystals. Research methods and devices: Optical and electrochemical methods. Nonstandard methods and devices for growing and research of large crystals. Theoretical and practical results, novelty: The principles of a new automated method for growing of the large diameter alkali halide crystals from the melt with changing geometry of it free surface in the variable section crucibles have been developed. Minimization of the free surface of the melt has allowed to automatize the stage of the radial growth and achieve an even distribution of the volatile activator throughout the whole volume of the crystal. The new technological processes of the growing of the radiation- and photo-resistant scintillationcrystals have been devel-oped, using these principles. Stage of implementation: New technological processes and growing equipment have been introduced in the experimental production of NTK "Institute for Single Crystals". Field of application: Hi-tech nuclear and medical equipment manufacturing, experimental high energy physics, and monitoring of the environment.