摘要
高能射线探测成像技术在高能物理研究、医疗影像和工业探测等领域具有重要应用.非铅金属卤化物具有毒性低、稳定性良好、发光效率高、Stokes位移大的优点,在X射线间接探测领域表现出重要的应用潜力.本文综述了近年来非铅金属卤化物闪烁体及薄膜成像器件的研究进展,首先介绍了材料组分与发光机理,然后列举了与闪烁体性能相关的关键参数,概述了单晶、粉末与纳米晶材料合成方法,阐述了近些年研究工作中关于提高成像器件分辨率的新颖思路,重点讨论了复合薄膜、陶瓷玻璃、结构化闪烁体等形式的新型闪烁体成像器件.最后,对目前闪烁体探测成像面对的挑战和潜在解决方案进行了总结与展望.
Abstract
High-energy radiation detection and imaging technology has important applications in high-energy physics research,medical imaging,industrial detection,and other fields.Lead-free metal halides have many advantages,such as low toxicity,good stability,high light yield,and large stokes shift;they exhibit excellent potential in indirect X-ray detection.The latest research progress of lead-free metal halide scintillators and imaging devices is reviewed herein.First,the material composition and luminescence mechanism are introduced.The key parameters of scintillator performance are listed.The synthesis methods of single crystal,powder,and nanocrystal are summarized.Some recent novel ideas about improving the resolution of imaging devices are also described.We focus on the new-type scintillator imaging devices,including composite film,ceramic,glass,and structured scintillators.Finally,we have summarized the challenges and potential problems of scintillator imaging detectors and provided some suggestions.
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