Improved Process for the Detector Grade TlBr Single Crystals
Improved Process for the Detector Grade TlBr Single Crystals
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DOI：
10.1109/nssmic.2006.353797
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
V. Kozlov;H. Andersson;M. Leskela;H. Sipila
中科院分区：
文献类型：
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作者：
V. Kozlov;H. Andersson;M. Leskela;H. Sipila
TlBr单晶具有较高的阻挡能力、密度(7.56g/cm3)和禁带宽度(2.68 eV)，是一种很有前途的室温伽马射线探测器。然而，材料纯度和晶体质量仍然限制了TlBr作为检测器的使用。本工作采用纯水水热重结晶和移动熔融区(TMZ)法对材料进行提纯，并用于单晶生长。用X射线摇摆曲线法对厚度为4 mm的样品进行了表征，并在偏振光下进行了光学表征。通过在-20分压-42℃下的漏电流测量，研究了TlBr晶体的电学性质。用55Fe和109Cd在同一温区的脉冲高度谱表征了TlBr的光谱性质。报道了观测结果，并进行了讨论。
The single crystal TlBr is a promising candidate as a room temperature gamma-ray detector due to its high stopping power, density (7.56 g/cm3) and bandgap (2.68 eV). However, material purity and crystal quality still limit the use of TlBr as detector. In this work, material was purified by hydrothermal recrystallization in pure water and traveling molten zone (TMZ) method that was used and for the single crystal growth. A sample of 4 mm thickness was characterized by the X-ray rocking curve method and optically under polarized light. The electrical properties of crystal TlBr were studied by leakage current measurements at -20 divide -42degC. Spectroscopic properties of TlBr were characterized by the pulse-height spectra of 55Fe and 109Cd at the same temperature region. The observed results are reported and discussed.