坩埚下降法生长钨酸镉晶体的闪烁性能  

Scintillation Property of Cadium Tungstate Single Crystal Grown by Vertical Bridgman Technique

作　　者：沈琦[1] 陈红兵[1] 王金浩[1] 蒋成勇[1] 潘建国[1] 徐军[2] 

机构地区：[1]新型功能材料及其制备科学国家重点实验室培育基地,宁波大学材料科学与工程研究所,宁波315211 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《人工晶体学报》2012年第4期844-848,852,共6页Journal of Synthetic Crystals

基　　金：973计划前期研究专项(2011CB612306);国家自然科学基金(21171102);宁波市自然科学基金(2010A610165);宁波大学科研基金(xkl09074;xkl067);宁波大学王宽诚幸福基金

摘　　要：以高温固相反应合成CdWO4多晶为原料,采用垂直坩埚下降法生长出大尺寸完整CdWO4晶体,就所生长CdWO4晶体进行了闪烁发光性能的测试表征,包括紫外可见透射光谱、光致发光光谱、光致发射衰减时间、X射线激发发射光谱、相对光产额以及γ射线辐照硬度。结果表明,该单晶在可见光区具有良好的光学透过性,其光致发光与X射线激发发射光的峰值波长位于475 nm左右,其光致发射衰减时间为842 ns;以CsI∶Tl晶体为基准样品,测得γ射线激发发光的光产额相当于基准样品的51.5%～57.4%,在γ射线辐照条件下其辐照硬度达107rad。Using the solid-state synthesized CdWO4 polycrystalline as the feed material, large-size CdWO4 single crystals were grown by vertical Bridgman process. The scintillation properties of CWO single crystals were characterized systematically by UV-visible transmission spectra, photoluminescence spectra, photoluminescence decay curve, X-ray excited luminescence spectra, the relative light yield and T-ray radiation hardness. The spectrum measurements show a high optical transmittance in the visible wavelength range and a strong emission with central wavelength at 475 nm under X-ray excitation. The photoluminescence decay time with central wavelength of 475 nm was measured to be 842 ns under the ultraviolet radiation. The relative light yield under γ-ray excitation was measured to be 51.5% -57.4% as compared to the standard sample CsI： T1. The single crystals were confirmed to possess a high irradiation hardness by the measured γ-ray radiation hardness of 107 rad.

关 键 词：钨酸镉 坩埚下降法 衰减时间 辐照硬度 

分 类 号：O78[理学—晶体学] O734