Abstract
Nonhygroscopic, high-radiation-absorptivity scintillation crystals of BGO (bismuth germanate: Bi4Ge3O12) have been grown by the horizontal Bridgman (HB) method using very sharply focused gas jets as the heat source. It was determined by means of optical and X-ray characterization that the crystal growth had been performed successfully. On the basis of a one-dimensional time-dependent heat transfer model, simulation analyses have been used to examine the validity of this method under various growth conditions: temperature distribution, locations of the boundaries between the crystal, melt and polycrystal components, and growth rates.
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