METHOD FOR PREPARING LARGE-SIZED SLABLIKE CE3+ ION DOPED RARE-EARTH ORTHOSILICATE-SERIES SCINTILLATI

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Disclosed is a method for preparing large-sized slablike Ce3+ ion doped rare-earth orthosilicate-series scintillation crystals by means of horizontal directional solidification. The method comprises : forming different temperature regions in a single crystal furnace by heating, wherein the temperature region by which a pre-crystallized material is in a molten state and then forms a melt is a high-temperature region, the temperature region by which a molten raw material is crystallized in a single crystal state is a low-temperature region, and a molten-to-single-crystal transition region naturally forms a temperature gradient region; then, horizontally moving a crucible filled with a raw material, so that the crucible sequentially passes through the high-temperature region, the temperature gradient region and the low-temperature region at a preset speed; and finally, performing annealing and cooling. In the present invention, Ce3+ : Re2SiO5 series scintillation crystals are prepared by using a horizontal directional solidification method , and the scintillation crystals have the outstanding advantages of large size, low defects, high quality, more uniform distribution of Ce3+ ion concentration, high utilization rate, less energy consumption, and the like.