Abstract
Macrosegregation produced during vertical Bridgman directional solidification of CsI-1 wt% T1I in crucibles of varying diameter, from 0.5 to 2.0 cm, has been examined. Gravity driven convection is present in the melt even in the smallest crucible diameter of 0.5 cm. Observed solutal profiles are in agreement with the analytical boundary layer model of Favier, which describes macrosegregation in the presence of convection. The scintillation efficiency of CsI decreases along the specimen length as the thallium iodine content of the alloy increases.
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