Characterization of indirect X-ray imaging detector based on nanocrystalline gadolinium oxide scintillators for high-resolution imaging application

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• 作者：Chang-Woo Seo ; Bo Kyung Cha ; ^{goldrain99@kaist.ac.kr} ; Sungchae Jeon ; Ryun Kyung Kim ; Young Huh
• 关键词：Co-precipitation synthesis ; Nanocrystalline Gd2O3 ; Eu scintillator ; X-ray imaging detector
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2013
• 出版时间：21 January, 2013
• 年：2013
• 卷：699
• 期：Complete
• 页码：129-133
• 全文大小：1361 K

文摘

Nanocrystalline Gd₂O₃:Eu scintillating powders were successfully synthesized through a co-precipitation process for X-ray imaging detector applications. In this work, as-synthesized sample was further calcinated at different temperature, time with 1-10 h and doped-Eu³⁺ concentration with 1-10 mol % in the electrical furnace. The characterization such as the crystal structures and microstructure of Gd₂O₃:Eu scintillator were measured by XRD and SEM experiment. The phase transition from cubic to monoclinic structure was observed at 1300 ¡ãC calcination temperature. Dominant emission peak of sample with cubic structure was appeared at 611 nm under 266 nm UV light excitation. After scintillation properties of synthesized Gd₂O₃:Eu scintillator were investigated, Gd₂O₃:Eu scintillating films with different thickness was fabricated onto glass substrate by a screen printing method. And then X-ray imaging performance in terms of the light response to X-ray exposure dose, signal-to-noise ratio (SNR) and spatial resolution were measured by combining the fabricated Gd₂O₃:Eu screen films with a lens-coupled CCD imaging detector under radiographic system conditions.