Heat distribution during melting and solidification of NaI(Tl) using skull technique

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• 作者：V. Taranyuk ; A. Gektin ; I. Kisil ; A. Kolesnikov
• 关键词：A1. Polycrystal ; A1. Temperature distribution ; A2. Skull method ; B1. NaI(Tl) ; B3. Thermocouple
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 出版时间：1 December, 2012
• 年：2012
• 卷：360
• 期：Complete
• 页码：95-98
• 全文大小：620 K

文摘

The goal of this work is to obtain the temperature distribution for skull technique growth for NaI(Tl) scintillator crystal growth. The experiments with 250¡Á180¡Á45 mm³ ingots were made. The temperature distribution along the crystal was checked experimentally during all technological stages: heating the raw materials, melting, crystal growth and cooling of crystal. The temperature was measured by the set of thermocouples, which were installed into the inner volume of the container with feedstock. The temperature gradient for all stages of process was determined. It is shown that deviations of the temperature rate at the control (bottom) thermocouple could be used as criteria for process stage change. It is obtained that for constant melting and crystallization rate during the process one should change the temperature rate of heater.