掺Y对PbWO_4闪烁体的热释光影响  

INFLUENCE OF Y^(3+)-DOPING ON THERMOLUMINESCENCE OF PbWO_4

作　　者：刘波[1,2] 施朝淑[1,2,3] 魏亚光 吴灿 李裕熊 胡关钦[5] 沈定中[5] 

机构地区：[1]中国科学技术大学结构分析研究实验室 [2]中国科学技术大学物理系,合肥230026 [3]中国科学技术大学国家同步辐射实验室,合肥230029 [4]中国科学技术大学国家同步辐射实验室 [5]中国科学院上海硅酸盐研究所

出　　处：《物理学报》2000年第10期2078-2082,共5页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :5 973 2 0 40和 197740 5 3 )资助的课题&&

摘　　要：研究了纯PbWO4 和PbWO4 :Y晶体经γ射线辐照和可见光光照前后室温以上的热释光 .发现大剂量辐照后掺Y可以有效地抑制热释光的强度并使热释光峰移向高温 ,说明掺Y有利于提高光输出的稳定性 .可见光光照也会影响热释光并可以产生新的热释光峰 ,这可能是由于光释电子 (或空穴 )被浅陷阱重新俘获或是光照后产生了新型色心的结果 .In this article,we studied the thermoluminescence of pure PbWO\-4 and PbWO\-4:Y above room temperature (30℃—300℃).We found that Y 3+ doping reduces the intensity of thermoluminescence of PbWO\-4 and moves the peaks of thermoluminescence to higher temperature after γ ray irradiation about 1?Mrad dose,which can improve the stability of PbWO\-4 luminescence.We also calculated the parameters of the traps,namely the depth of traps,frequency factor and the time of release from the traps at 300?K.Visible light can also influence thermoluminescence.The intensity of thermoluminescence below 240℃ increased after blue and green illumination for all samples.Furthermore,visible light can induce new thermoluminescence peaks in some samples,which is caused either by that the carriers released by visible light are subsequently retrapped by some shallower traps,or the visible light illumination may possibly create new types of traps.

关 键 词：热释光 钨酸铅 掺杂 钇 闪烁体 

分 类 号：O432[机械工程—光学工程]