A kind of bilayer structure ceramic scintillators designed for phoswich detectors
A kind of bilayer structure ceramic scintillators designed for phoswich detectors
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DOI：
10.1111/jace.15080
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发表时间：
2017-12
影响因子：
3.9
通讯作者：
Zewang Hu;Xiaopu Chen;D. Ding;Maoqing Cao;Yun Shi;H. Kou;Haohong Chen;Tengfei Xie;Lexiang Wu-Lexiang
中科院分区：
文献类型：
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作者：
Zewang Hu;Xiaopu Chen;D. Ding;Maoqing Cao;Yun Shi;H. Kou;Haohong Chen;Tengfei Xie;Lexiang Wu-Lexiang
光敏探测器可以确定核与基质相互作用的位置，是提高正电子发射断层成像视场边缘空间分辨率的有效途径。在本研究中，我们提出了一种用于磷酸盐探测器的双层结构石榴石陶瓷闪烁体。采用固相反应和真空烧结的方法制备了不同厚度比的Pr：LuAg/Ce：LuAG双层陶瓷闪烁体。对其物相、微观结构、荧光和闪烁性能进行了表征和研究。Pr：LuAG层的衰减时间约为21.8 ns，而Ce：LuAG层的衰减时间约为58.6 ns。在Pr：LuAG层和Ce：LuAG层中分别观察到290-450 nm和475-700 nm的5d-4f发射带。这两个特性满足了光敏探测器的基本要求。在脉冲高度谱中实现了不同层次与γ射线相互作用的分离。这些特性表明，这种多层结构的石榴石陶瓷闪烁体在光敏探测器领域具有潜在的应用价值。
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The phoswich detectors can determine the location of nuclear interactions with the matrix and it is an effective approach to improve the spatial resolution at the edge of the field of view in positron emission tomography. In this study, we proposed a kind of bilayer structure garnet ceramic scintillators for phoswich detectors. Bilayer Pr:LuAG/Ce:LuAG ceramic scintillations with different thickness ratio were fabricated through solid-state reaction and vacuum sintering without further cutting or stacking process. The phase, microstructure, fluorescence and scintillation properties were characterized and studied. The decay time of the Pr:LuAG layer was about 21.8 ns while that of the Ce:LuAG layer was 58.6 ns. Different 5d-4f emission bands of 290–450 and 475-700 nm were observed in the Pr:LuAG layer and Ce:LuAG layer, respectively. These two features meet the basic requirements of phoswich detectors. Separation of interactions with γ-ray in different layers has achieved in the pulse height spectra. These properties reveal that this kind of mutilayer structure garnet ceramic scintillators have potential application value in the field of phoswich detectors.
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