Spatial Resolution of an Inorganic Crystal-Based Hard X-Ray Imager

Gigahertz hard X-ray imaging presents an unprecedented challenge to both timing and spatial resolutions for inorganic scintillator-based front imagers. A beam test with 30-keV X-rays from the Advanced Photon Source (APS) showed that 5-mm BaF 2 plates resolve well 30-keV X-ray septuplets of 27-ps wid...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2020-06, Vol.67 (6), p.1014-1019
Main Authors: Hu, Chen, Zhang, Liyuan, Zhu, Ren-Yuan, Chen, Junfeng, Ding, Dongzhou, Wang, Yu, Zhang, Mingrong
Format: Article
Language:English
Subjects:
Apertures
Attenuation
Barium fluoride
Barium fluorides
Cameras
Crystals
Engineering
Image quality
LYSO
Nuclear Science & Technology
R&D
Research & development
Scintillation counters
Screens
Silicon carbide
Slicing
Spatial discrimination
Spatial resolution
ultrafast
X ray imagery
X-ray imaging
X-rays
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Summary:Gigahertz hard X-ray imaging presents an unprecedented challenge to both timing and spatial resolutions for inorganic scintillator-based front imagers. A beam test with 30-keV X-rays from the Advanced Photon Source (APS) showed that 5-mm BaF 2 plates resolve well 30-keV X-ray septuplets of 27-ps width and 2.83-ns spacing. Pixelated crystal screens with a pitch down to 400~\mu \text{m} were fabricated by mechanic slicing for BaF 2 , BaF 2 :Y, and LYSO crystals. Their spatial resolution and detection efficiency for hard X-rays are defined by the pitch and thickness, respectively. Thicker monolithic crystal screens show poorer spatial resolution, which may be improved using a small optical aperture with a loss in both efficiency and dynamic range for hard X-rays. Future plans include pursuing smaller crystal pitches by laser slicing and research and development on novel ultrafast inorganic scintillators.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2020.2978800