人工晶体学报2025，Vol.54Issue(12)：2112-2118,7.DOI:10.16553/j.cnki.issn1000-985x.2025.0176
Gd3(Al,Ga)5O12:Ce闪烁屏的同步辐射X射线成像研究
X-Ray Imaging Performance of Gd3(Al,Ga)5O12:Ce Scintillation Screens under Synchrotron Radiation
摘要
Abstract
Gd3(Al,Ga)5O12:Ce(GAGG)scintillators,characterized by high density(6.63 g/cm3),high light yield(＞58 000 ph/MeV),fast decay time(～90 ns),and stable physicochemical properties,are promising candidates for high spatial resolution X-ray imaging scintillation screens.Determining the spatial resolution limit of the GAGG scintillation screen and approaching this limit cost-effectively is a significant yet challenging task.In this work,GAGG single crystals without co-doping and with Mg or Yb co-doping were grown by the Czochralski method.A series of GAGG scintillation screens were prepared by cutting and polishing,and their optical and scintillation properties were systematically characterized.The theoretical spatial resolution was calculated via Geant4 simulations,and imaging experiments were conducted at the BL13HB beamline of the Shanghai Synchrotron Radiation Facility(SSRF).Experimental studies confirm that GAGG scintillation screens exhibit superior imaging performance in X-ray applications,particularly beneficial for medical imaging and industrial nondestructive inspection applications.The theoretical spatial resolution of GAGG scintillation screens is 0.4 μm,whereas our experiment attained 0.9 μm(555 lp/mm),a performance level that aligns with current state-of-the-art systems in the field.Comparative analysis reveals that spatial resolution exhibits limited variation with screen thickness in the 0.3～1 mm range,but shows greater sensitivity to surface conditions and optical transmittance.Therefore,in fabricating high-resolution GAGG scintillation screens,excessive reduction in thickness below practical thresholds is unnecessary.Efforts should prioritize improving crystalline optical quality through growth process optimization(inclusion suppression)and polishing technique refinement(surface roughness control).关键词
GAGG:Ce/石榴石/闪烁体/闪烁屏/X射线成像/空间分辨率Key words
GAGG:Ce/garnet/scintillator/scintillation screen/X-ray imaging/spatial resolution分类
数理科学引用本文复制引用
LI Mingqing,ZHAO Shuwen,FENG Jing,ZHENG Xiang,GUO Han,YUAN Lanying,DING Dongzhou,FENG He..Gd3(Al,Ga)5O12:Ce闪烁屏的同步辐射X射线成像研究[J].人工晶体学报,2025,54(12):2112-2118,7.基金项目
国家重点研发计划(2022YFB3503900) （2022YFB3503900）
国家自然科学基金面上项目(12275347) （12275347）
中国博士后科学基金(2023M743649) （2023M743649）
