α-Al2O3：C晶体的热释光和光释光特性  

Thermoluminescence and optically stimulated luminescence characteristics of α-Al_2O_3:C crystal

作　　者：杨新波[1,2] 李红军[3] 徐军[1] 程艳[3,2] 苏良碧[1] 唐强[4] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海201800 [2]中国科学院研究生院,北京100049 [3]中国科学院上海光学精密机械研究所,上海201800 [4]中山大学物理系,广州510275

出　　处：《物理学报》2008年第12期7900-7905,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60607015);国家高技术研究发展计划(批准号:2006AA03A104)资助的课题~~

摘　　要：以高纯α-Al2O3和石墨为原料,采用温梯法生长了α-Al2O3:C晶体,使用RisΦTL/OSL-DA-15型热释光和光释光仪研究了其热释光和光释光特性.α-Al2O3:C晶体在462K附近有单一热释光峰,发射波长位于410nm.随着辐照剂量的增加,热释光强度逐渐增强,462K的热释光特征峰位置保持不变.α-Al2O3:C晶体的光释光衰减曲线由快衰减和慢衰减两个部分组成,随着辐照剂量的增加,快衰减部分衰减速率变化不大,而慢衰减部分衰减速率加快.在5×10-6—10Gy剂量范围内,α-Al2O3:C晶体的热释光剂量响应呈现良好的线性关系,30Gy时达到饱和;光释光剂量响应在5×10-6—60Gy剂量范围内呈现良好的线性关系,100Gy时达到饱和.与热释光相比,光释光剂量响应具有更高的灵敏度和更宽的线性剂量响应范围.In this work,α-Al2O3：C crystal was grown by temperature gradient technique using α-Al2O3 and graphite powder as raw materials, and the thermoluminescence （TL） and optically stimulated luminescence （OSL） of the crystal were investigated by RisФ TL/OSL-DA-15. The as-grown α-Al2O3 ： C crystal shows a single TL peak at 462 K and blue emission peak at 410 nm. The TL intensity increases as irradiation dose increases, but no shift is found in the position of the glow peak. The OSL decay curve of α-Al2O3 ： C crystal consists of two components, namely the fast component and the slow component. With the increasing of the dose, the decay rate of the fast component almost remains unaltered while that of the slow component increases. The TL response of the crystal shows excellent linear characteristic in the dose range of 5 × 10^-6-10 Gy, and saturation is observed at 30 Gy. The OSL response shows excellent linear characteristic in the dose range of 5 × 10^-6-60 Gy, and reaches saturation at 100 Gy. Compared with TL response, OSL response shows higher sensitivity and wider linear dose response.

关 键 词：Α-AL2O3 :C 热释光 光释光 

分 类 号：O734[理学—晶体学]