Scintillation characteristics of GSO single crystal grown under O/sub 2/-containing atmosphere
Scintillation characteristics of GSO single crystal grown under O/sub 2/-containing atmosphere
复制标题
含O/sub 2/气氛下生长的GSO单晶的闪烁特性
DOI：
10.1109/23.467752
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发表时间：
1995
影响因子：
1.8
通讯作者：
K. Susa
中科院分区：
文献类型：
--
作者：
Kurata Yasushi;K. Kurashige;H. Ishibashi;K. Susa
Ce掺杂Gd/sub 2/SiO/sub 5/ (GSO)单晶是一种优异的闪烁体，具有光输出大、衰减常数短和吸收系数高的特点。我们研究了闪烁特性对生长气氛的依赖性。 GSO晶体通常在纯N/sub 2/中生长，由于生长过程中的热蚀刻总是使晶锭表面变得粗糙，在表面上产生一些微裂纹，这常常会引发晶锭中的大裂纹。为了消除这个问题，我们首先引入含有 1 vol% O/sub 2/ 的 N/sub 2/ 气体作为生长气氛。所得的晶锭表面变得非常光滑，但颜色呈浅黄色并且闪烁特性下降。为了保留这些特性，我们随后引入了退火工艺，发现纯 N/sub 2/气氛下的退火对于颜色和闪烁特性的恢复非常有效。 >
A Ce doped Gd/sub 2/SiO/sub 5/ (GSO) single crystal is an excellent scintillator featuring a large light output, a short decay constant and a high absorption coefficient. We have investigated dependence of the scintillation characteristics on the growth atmosphere. GSO crystal is usually grown in pure N/sub 2/, which due to thermal etching during the growth always roughens the boule surface, inducing some micro-cracks on the surface which often triggers the large crack in the boule. To eliminate this, we first introduced 1 vol% O/sub 2/-containing N/sub 2/ gas for the growth atmosphere. The resultant boule turned to be very smooth in surface, but pale yellow in color and degraded in the scintillation characteristics. To retain these properties, we then introduced an annealing process and found the annealing under pure N/sub 2/ atmosphere quite effective on the recovery both in color and scintillation properties. >