Homogeneity of Gd-based garnet transparent ceramic scintillators for gamma spectroscopy

被引：37
|
作者：
Seeley, Z. M. [1 ]
Cherepy, N. J. [1 ]
Payne, S. A. [1 ]
机构：
[1] Lawrence Livermore Natl Lab, Div Chem Sci, Livermore, CA 94550 USA
来源：
JOURNAL OF CRYSTAL GROWTH | 2013年 / 379卷
关键词：
Densification; Sinter-HIP; Garnet; Optical ceramic; Scintillator; GROWTH;
D O I：
10.1016/j.jcrysgro.2012.11.042
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Transparent polycrystalline ceramic scintillators based on the composition Gd1.49Y1.49Ce0.02Ga2.2Al2.8O12 are being developed for gamma spectroscopy detectors. Scintillator light yield and energy resolution depend on the details of various processing steps, including powder calcination, green body formation, and sintering atmosphere. We have found that gallium sublimation during vacuum sintering creates compositional gradients in the ceramic and can degrade the energy resolution. While sintering in oxygen produces ceramics with uniform composition and little afterglow, light yields are reduced, compared to vacuum sintering. By controlling the atmosphere during the various process steps, we were able to minimize the gallium sublimation, resulting in a more homogeneous composition and improved gamma spectroscopy performance. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：79 / 83
页数：5
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