Persistent scintillators for X-ray repetitive imaging with stable energy traps

IF 5.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2025-01-03 DOI:10.1016/j.jre.2025.01.002

Yuan Wang , Peng Zhang , Xu Tian , Daiyuan Liu , Jian Zhang , Zhichao Liu , Xiuxia Yang , Jie Yu , Jianxiong Shao , Xuhui Xu

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引用次数: 0

Abstract

Scintillator is a key material for the development of X-ray detectors, which has a promising application in medical imaging, security inspection and industrial non-injury detection. The majority of scintillators currently used in imaging are real-time imaging scintillators, which can cause ionization radiation damage to biological subjects or detection equipment during the imaging process and require complex, highly sensitive detection systems. Therefore, exploring stable, environmentally friendly scintillator materials that can achieve delayed imaging is of significance in the field of imaging. Herein, we developed an X-ray time-lapse imaging scintillator, Sr₂Al₆O₁₁:Dy³⁺ phosphor, which generates stable traps by X-ray irradiation, thus endowing it with excellent persistent luminescence and information storage properties (>42 d). Moreover, traps constructed by X-ray can be repeatedly refilled (>40 times) under UV light and carriers are released in the form of mechanical or thermal excitation when refilling is complete. By constructing the traps in the phosphor during X-ray excitation and using it for repetitive imaging, the detection limit is 74.78 nGy/s, and the spatial imaging resolution is as high as 16 lp/mm. This discovery provides a new idea for the development of time-delayed X-ray scintillator.

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稳定能量阱用于x射线重复成像的持续闪烁体

闪烁体是研制x射线探测器的关键材料，在医学成像、安全检查和工业无损检测等方面有着广阔的应用前景。目前用于成像的闪烁体多数为实时成像闪烁体，在成像过程中会对生物主体或检测设备造成电离辐射损伤，需要复杂、高灵敏度的检测系统。因此，探索能够实现延迟成像的稳定、环保的闪烁体材料在成像领域具有重要意义。在此，我们开发了一种x射线延时成像闪烁体Sr2Al6O11:Dy3+荧光粉，通过x射线照射产生稳定的陷阱，从而赋予其优异的持续发光和信息存储性能（>42 d）。此外，x射线构建的陷阱可以在紫外光下重复填充（>；40次），填充完成后载流子以机械或热激发的形式释放。通过在x射线激发时在荧光粉中构建陷阱，并利用其进行重复成像，检测限为74.78 nGy/s，空间成像分辨率高达16 lp/mm。这一发现为延时x射线闪烁体的发展提供了新的思路。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.