Effects of Ce concentration on scintillation properties of LaBr3:Ce
Effects of Ce concentration on scintillation properties of LaBr3:Ce
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DOI：
10.1109/tns.2005.856906
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发表时间：
2005-10-01
影响因子：
1.8
通讯作者：
Shah, KS
中科院分区：
文献类型：
--
作者：
Glodo, J;Moses, WW;Shah, KS
在这篇文章中，我们研究了LaBr3：Ce的闪烁特性作为Ce浓度的函数。我们研究了名义上掺杂0.5%、5%、10%、20%和30%Ce（摩尔）的晶体。先前的报道表明，随着Ce含量的增加，光输出减少，衰减时间常数几乎没有变化。这些结果表明，光输出不随Ce浓度高达30%而改变，并且主要取决于晶体质量。另一方面，我们已经发现的定时性能是一个强大的功能的Ce浓度。随着Ce含量的增加，闪烁的主衰减时间常数从0.5%Ce的26 ns降低到> 5%Ce的17 ns。此外，上升时间常数也有显著变化。对于掺杂0.5%Ce的样品，测量的上升时间高达9ns，而对于掺杂> 10%Ce的样品，其小于0.5Its。上升时间的变化对该闪烁体的定时特性有重大影响，定时分辨率从361 ps提高到小于100 ps（半峰全宽）。
In this communication, we investigate the scintillation properties of LaBr3: Ce as a function of Ce concentration. We have studied crystals nominally doped with 0.5%, 5%, 10%, 20%, and 30%Ce (by mole). Previous reports suggest that as the Ce content increases, there is a decrease in light output and little or no change in decay time constants. These results show that the light output does not change with Ce concentration up to 30% and depends mostly on the crystal quality. On the other hand we have found the timing properties to be a strong function of Ce concentration. As the Ce content increases, the principal decay time constant of scintillation decreases from similar to 26 ns for 0.5%Ce to similar to 17 ns; for crystals with > 5% Ce. Moreover, there is a significant change in rise time constants. The rise time measured for a sample doped with 0.5%Ce is up to 9 ns, whereas for samples doped with > 10%Ce it is less than 0.5 Its. The change of rise time has a major effect on the timing properties of this scintillator, with timing resolution improving from 361 ps to less than 100 ps (full width at half maximum).