高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

熔体组成与PbWO4:Y3+晶体闪烁性能稳定性的关系

张昕; 廖晶莹; 谢建军; 沈炳孚; 邵培发; 倪海洪; 李长泉; 殷之文   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:2001-10-12 修回日期:2001-11-09 出版日期:2002-11-20 网络出版日期:2002-11-20

Relationship between Melt Composition and Stability of Scintillation Properties of PbWO4:Y3+ Crystals

ZHANG Xin; LIAO Jing-Ying; XIE Jian-Jun; SHEN Bin-Fu; SHAO Pei-Fa; NI Hai-Hong; LI Chang-Quan; YIN Zhi-Wen   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-10-12 Revised:2001-11-09 Published:2002-11-20 Online:2002-11-20

PDF (PC)

863

摘要： 部分PWO:Y3+晶体辐照后光产额升高,并且辐照硬度对退火温度较敏感.本文选取未掺杂及Sb、La3+、Y3+单掺和La3+/Sb、Y3+/Sb双掺的PWO样品进行对照实验,同时选取代表性晶体的顶部急冷料做了X射线荧光主量分析.结果发现:低剂量辐照后光产额升高现象只存在于含Y3+离子的PWO晶体中,并且这类晶体往往存在420nm吸收带;在改进Bridgeman法生长PWO晶体的后期,使熔体保持一定程度的负电性将有利于抑制该现象,即可有效地抑制同样是负电性的间隙氧进入晶体.结合测试数据,本文讨论了该现象的起因和机理,提出了掺杂剂的选择原则.

关键词: 钨酸铅, 掺杂, 光产额, 熔体, 辐照硬度

Abstract: The light yield of some Y3+ doping PbWO4 crystals increases after low dose rate irradiation, and
the radiation hardness is sensitive to annealing temperature. In this study, the experiments among Sb, La3+, Y3+ doping and La3+/Sb,
Y3+/Sb co-doping PWO crystals were carried out, the composition of the melt in the top of the crystals was also measured by the XRF method. The
experimental results show that this exceptional behavior only exists in PWO crystals containing Y3+ ions. In addition those crystals have 420nm
absorption band in optical transmission spectra. In the processes of PWO crystal growth by the modified Bridgeman method, it is salutary to keep the melt
in a negative charge environment, thus preventing the formation of interstitial oxygen. Integrating with the data obtained, the mechanism of this phenomenon
was discussed, and the principles of choosing dopants to suppress it were also brought forward.

Key words: lead tungstate, doping, light yield, melt, radiation hardness

中图分类号: