用于X射线成像的铽离子掺杂硅酸盐微晶玻璃  

Terbium Ion Doped Silicate Glass-Ceramics for X-ray Imaging

作　　者：李鑫 张健 罗思媛 肖建强 张胜 吴军霄 刘志超 李保珠[2] 徐旭辉[1] LI Xin;ZHANG Jian;LUO Siyuan;XIAO Jianqiang;ZHANG Sheng;WU Junxiao;LIU Zhichao;LI Baozhu;XU Xuhui(Faculty of Materials Science and Engineering,Key Laboratory of Advanced Materials of Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Land Resources Engineering of Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南省新材料制备与加工重点实验室,昆明650093 [2]昆明理工大学国土资源工程学院,昆明650093

出　　处：《硅酸盐学报》2024年第8期2502-2508,共7页Journal of The Chinese Ceramic Society

基　　金：云南省科技厅面上项目(202301AT070149);云南省科技厅昆明理工大学“双一流”创建联合专项面上项目(202201BE070001-029);云南省科技重大专项(202202AG050016-4,202202AG050004)。

摘　　要：X射线成像在工业、医疗和科学研究中得到广泛应用。与直接式X射线探测相比,间接式X射线探测是一种更便宜、更稳定的选择。但如今商用闪烁体大都存在制备成本高、稳定性差等问题,因此寻找制备简单、低成本、高化学稳定性和环境友好的新型闪烁体材料是必要的。通过高温熔融法和热处理工艺,成功地在硅酸盐玻璃基体内原位生长出ZnGa_(2)O_(4)纳米晶,通过掺杂Tb^(3+)、调整退火温度,使材料既具有高透明度又具有高闪烁性能(光产额优于商业闪烁体BGO)。在X射线下表现出良好的成像性能,实现了16 lp/mm的成像分辨率。同时还表现出长时间的环境稳定性和辐射发光稳定性。这些优异的性能使得ZnGa_(2)O_(4):Tb^(3+)闪烁体玻璃在玻璃闪烁体间接成像领域具有很大的应用潜力。Introduction X-ray detectors could be divided into direct and indirect types,the latter has cheaper and more stable properties.As the key component of indirect detection,scintillators could convert high-energy photons into low-energy ultraviolet or visible photons.However,the preparation process of traditional scintillation single crystals is relatively complex and costly,and the hygroscopicity of materials also puts strict requirements on their working environment and packaging technology.Moreover,the Tl and Cd are toxic and not environmentally friendly.Therefore,it is very necessary to find new scintillators with simple preparation,low-cost,chemically stable,and environmentally stable properties.The glass-ceramics combines the excellent optical properties of nanocrystals with the high stability and transparency of inorganic glass,and could be easily obtain with high-quality,large-area glass-ceramics.Rare earth ions have special energy level structures and luminescence characteristics.Under optical excitation,they can absorb energy and emit light of specific wavelengths,thereby enhancing their scintillation performance and luminescence characteristics,and are resistibility to radiation damage.When the scintillation glass is irradiated by external excitation light sources,the rare earth ions absorb the energy and transfer to high energy level state,and then release energy through radiation transitions.In this paper,rare earth ions are doped into glass-ceramics to introduce efficient luminescent centers.The luminescence performance of ZnGa_(2)O_(4):Tb^(3+)glass-ceramics under X-ray irradiation and its indirect imaging ability are studied.Methods To prepare ZnGa_(2)O_(4) glass-ceramics composing of 52SiO_(2)-10Na_(2)CO_(3)-22ZnO-16Ga_(2)O_(3)-x%Tb_(4)O_(7)(mole fraction),the raw materials were weighed and ground in an agate mortar for 15 minutes.After uniformly mixing,the powder was transferred to a 30 ml alumina crucible and melted at 1600℃for 60 minutes.The sample was poured onto a preheated copper plate at 350

关 键 词：微晶玻璃 X射线成像 透明闪烁体 铽离子 

分 类 号：TQ171.733[化学工程—玻璃工业]