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We investigated the energy-dependent scintillation intensity of Eu-doped fluorozirconate glass-ceramic x-ray detectors in the energy range from 6 to 20 keV. The experiments were performed at the Advanced Photon Source, Argonne National Laboratory. The glass ceramics are based on Eu-doped fluorozirconate glasses, which were additionally doped with chlorine to initiate the nucleation of BaCl2 nanocrystals therein. The x-ray excited scintillation is mainly due to the 5d-4f transition of Eu2+ embedded in the BaCl2 nanocrystals; Eu2+ in the glass does not luminesce. Upon appropriate annealing the nanocrystals grow and undergo a phase transition from a hexagonal to an orthorhombic phase of BaCl2. The scintillation intensity is investigated as a function of the x-ray energy as well as of the particle size and structure of the embedded nanoparticles. The scintillation intensity versus x-ray energy dependence shows that the intensity is inversely proportional to the photoelectric absorption of the material, i.e. the more photoelectric absorption the less scintillation.
Stefan Schweizer,Bastian Henke,Stephanie Köneke,Jacqueline A. Johnson,Gang Chen, andJohn Woodford
"Energy-dependent scintillation intensity of fluorozirconate-based glass-ceramic x-ray detectors", Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422Y (2 March 2006); https://doi.org/10.1117/12.653769
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Stefan Schweizer, Bastian Henke, Stephanie Köneke, Jacqueline A. Johnson, Gang Chen, John Woodford, "Energy-dependent scintillation intensity of fluorozirconate-based glass-ceramic x-ray detectors," Proc. SPIE 6142, Medical Imaging 2006: Physics of Medical Imaging, 61422Y (2 March 2006); https://doi.org/10.1117/12.653769