SrSO_4:Eu磷光体的热释光特性  

TL characteristic properties of SrSO_4: Eu phosphor

作　　者：唐强[1] 张纯祥[1] 梁宝鎏[2] 李德卉[2] 陈晶亮[1] 罗达玲[1] 

机构地区：[1]中山大学物理系,广东广州510275 [2]香港城市大学物理及材料科学系

出　　处：《核电子学与探测技术》2004年第3期322-324,321,共4页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金项目(10275100);香港城市大学研究基金(ProjectNo.7001104)资助

摘　　要：研究了掺杂得到的SrSO4:Eu(0.1mol%)的粉末样品的热释光(TL)发光曲线和三维光谱。用90Sr的β射线辐照0.116～1.16kGy后,测到的热释光峰发光曲线,观察到只有一个主剂量峰,峰温位于(231.5±2.3)℃。用热释光一般级动力学方程拟合发光曲线,得到了峰参数和陷阱参数值。主剂量峰基本上不随照射剂量发生变化,辐射剂量响应为线性-亚线性。用60Coγ辐照100Gy后,测量了热释光三维光谱,确定了发光波长主要位于375nm,与其他硫酸盐基质材料中掺Eu的CaSO4:Eu,MgSO4:Eu比较,波长有所不同,可以确定这是来自于Eu2+能级跃迁的发光。The thermoluminescence (TL) glow curves and 3D emission spectra of SrSO_4:Eu ((0.1)mol%) powder sample were measured. The TL glow curves, measured after exposed to beta rays of ^(90)Sr with the dose range of 0.116~1.16kGy, show that emission peak is at (231.5±2.3)℃. The peak parameters and trap parameters were estimated by fitting these curves using the TL general kinetic order equation. The peak temperature is almost a constant when absorbed dose is changed, and the dose response of the peak height is linear-sublinear. The TL 3D spectra were measured after gamma rays irradiation (absorbed dose is 100Gy) of ^(60)Co source. It shows that the emission wavelength is at about 375nm. The wavelength is different from other Eu doped sulfate phosphors, such as CaSO_4:Eu, MgSO_4:Eu, but it is sure that the luminescence comes from transitions between energy levels of Eu^(2+).

关 键 词：硫酸锶 铕掺杂 发光谱 热释光 β射线辐照 

分 类 号：TL818.3[核科学技术—核技术及应用]