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人工晶体学报 ›› 2025, Vol. 54 ›› Issue (12): 2112-2118.DOI: 10.16553/j.cnki.issn1000-985x.2025.0176

• 研究论文 • 上一篇    下一篇

Gd3(Al,Ga)5O12∶Ce闪烁屏的同步辐射X射线成像研究

李铭清1,2(), 赵书文2, 封晶1, 郑祥2, 郭瀚3, 袁兰英2, 丁栋舟2(), 冯鹤1()   

  1. 1.上海大学材料科学与工程学院,上海 200444
    2.中国科学院上海硅酸盐研究所,上海 201899
    3.中国科学院上海高等研究院,上海 201204
  • 收稿日期:2025-08-04 出版日期:2025-12-20 发布日期:2026-01-04
  • 通信作者: 丁栋舟,博士,正高级工程师。E-mail:dongzhou_ding@mail.sic.ac.cn;冯鹤,博士,教授。E-mail:fh117@shu.edu.cn
  • 作者简介:李铭清(1996—),男,四川省人,博士研究生。E-mail:790526695@qq.com
  • 基金资助:
    国家重点研发计划(2022YFB3503900);国家自然科学基金面上项目(12275347);中国博士后科学基金(2023M743649)

X-Ray Imaging Performance of Gd3(Al,Ga)5O12∶Ce Scintillation Screens under Synchrotron Radiation

LI Mingqing1,2(), ZHAO Shuwen2, FENG Jing1, ZHENG Xiang2, GUO Han3, YUAN Lanying2, DING Dongzhou2(), FENG He1()   

  1. 1. School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China
    2. Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China
    3. Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China
  • Received:2025-08-04 Online:2025-12-20 Published:2026-01-04

摘要: Gd3(Al,Ga)5O12∶Ce(GAGG)闪烁体综合性能优异,是高空间分辨率闪烁屏的重要候选材料。探究GAGG闪烁屏空间分辨率的影响因素是一项重要且极具挑战的任务。本工作制备了一系列GAGG单晶闪烁屏,测试了其光学与闪烁性能,通过Geant4模拟计算了理论空间分辨率,在上海同步辐射光源(SSRF)BL13HB光束线站开展了成像试验。结果表明,GAGG闪烁屏对生物组织与工业芯片具有优异的成像效果。GAGG闪烁屏的理论空间分辨率为0.4 μm,本实验最高可实现0.9 μm(555 lp/mm)。对比发现,闪烁屏厚度在0.3~1 mm变化不会对空间分辨率产生显著影响,空间分辨率对闪烁屏的表面状态和光学透过率更敏感。因此,在后续制备GAGG闪烁屏的过程中,可不用过分追求超薄厚度,而应将更多注意力放在如何提高单晶光学质量,比如优化生长工艺,减少包裹体;改进抛光工艺,提升闪烁屏表面光洁度。

关键词: GAGG∶Ce; 石榴石; 闪烁体; 闪烁屏; X射线成像; 空间分辨率

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).

Key words: GAGG∶Ce; garnet; scintillator; scintillation screen; X-ray imaging; spatial resolution

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