EFFECT OF SURFACE-ROUGHNESS AND CRYSTAL SHAPE ON PERFORMANCE OF BISMUTH-GERMANATE SCINTILLATORS
EFFECT OF SURFACE-ROUGHNESS AND CRYSTAL SHAPE ON PERFORMANCE OF BISMUTH-GERMANATE SCINTILLATORS
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DOI：
10.1143/jjap.25.1435
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发表时间：
1986-09-01
期刊：
影响因子：
--
通讯作者：
ISHII, M
中科院分区：
文献类型：
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作者：
ISHIBASHI, H;AKIYAMA, S;ISHII, M
为了提高锗酸铋晶体的闪烁输出，实验研究了表面粗糙度和晶体形状对闪烁输出的影响。我们发现，最佳的闪烁输出获得了适当的纵横比的闪烁体，即，它的长度“h”，宽度“a”（h/a），取决于它们的表面粗糙度。当h/a> 6时，抛光闪烁体表面可以获得高闪烁光输出，但当h/a< 6时，粗糙表面可以获得高闪烁光输出。此外，当闪烁体表面设置有反射涂层时，光输出显著改善。的依赖性的光输出的表面粗糙度和晶体的形状进行了讨论，在闪烁体内部的传输损耗和表面处的反射损耗。
To improve the scintillation output of bismuth germanate scintillators, the influence of surface roughness and crystal shape has been experimentally studied. We found that an optimum scintillation output is obtained for an appropriate aspect ratio of the scintillator, ie, its length" h" to width" a"(h/a), depending on their surface roughness. A high scintillation light output can be obtained for polished scintillator surfaces when h/a> 6, but for rough surfaces when h/a< 6. In addition, when scintillator surfaces are provided with a reflective coating, the light output is markedly improved. The dependence of the light output on the surface roughness and crystal shape is discussed in terms of the transmission loss inside the scintillator and the reflection loss at the surface.