Scintillation yield of Bi4Ge3O12 (BGO) pixel crystals
Scintillation yield of Bi4Ge3O12 (BGO) pixel crystals
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DOI：
10.1016/j.physb.2009.12.061
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发表时间：
2010-03-15
影响因子：
2.8
通讯作者：
Berkowski, Marek
中科院分区：
文献类型：
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作者：
Drozdowski, Winicjusz;Wojtowicz, Andrzej J.;Berkowski, Marek
本文报道了在抛光的2×2×10 mm(3)像素和2×2×2 mm(3)立方体样品上进行的闪烁产额和低温热释光的测量。水平放置在PMT窗口上的像素的产额以及立方体的产额大约是垂直放置的像素产额的两倍，这种明显的光损失在简单的双射线模型的框架内被解释，该模型定量地描述了像素样品的闪烁产额取决于与此相关的测量几何。讨论了通常过度使用“BGO单位”来表示任何闪烁体的光输出的情况。热释光发光曲线由归因于陷阱的存在的几个峰组成，这被证明是导致在短时间窗口内在室温下测量的闪烁产额略有下降的原因，以改善BGO晶体的性能。应努力减少内部光损失和陷阱浓度，主要重点放在前(C)2009年埃尔塞维尔B.V.。保留所有权利
BGO crystals have been grown using the Czochralski method by the West Pomeranian University of Technology in Szczecin, Poland We report the measurements of scintillation yield and low temperature thermoluminescence, performed on polished 2 x 2 x 10 mm(3) pixel and 2 x 2 x 2 mm(3) Cube samples. The yield of the pixels placed horizontally on the PMT window, as well as of the Cubes, is about twice higher than the yield of the pixels placed vertically Such a distinct light loss is interpreted in the frame of a simple two-ray model, describing quantitatively the scintillation yield of pixel samples depending on the measurement geometry Related to this effect, the common overuse of "BGO units" for expressing the light Output of any scintillator is discussed Thermoluminescence glow curves consist of several peaks attributed to the existence of traps, which turn Out to be responsible for a slight decrease of the scintillation yield measured at room temperature in a short time window To improve the performance of BGO crystals. efforts should be aimed at reducing both the internal light losses and the trap concentration, with the main emphasis laid on the former (c) 2009 Elsevier B.V. All rights reserved