1. Luminescence Efficiency of Gd2 SiO5 :Ce Scintillator Under X-Ray Excitation.
- Author
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Valais, Ioannis G., Kandarakis, Ioannis S., Nikolopoulos, Dimitris N., Sianoudis, Ioannis A., Dimitropoulos, Nikolaos, Cavouras, Dionisis A., Nomicos, Constantinos D., and Panayiotakis, George S.
- Subjects
LUMINESCENCE ,CERIUM ,SCINTILLATORS ,DETECTORS ,POSITRON emission tomography ,RADIATION - Abstract
Gd
2 SiO5 :Ce (GSO:Ce) is a high-Z, nonhygroscopic fast emitting scintillator used in detectors of positron emission tomography (PET) systems. The purpose of this study was to evaluate the luminescence efficiency of GSO:Ce scintillator under irradiation conditions employed in X-ray medical imaging, since findings may be of value in novel applications such as computed tomography breast imaging or modern fast image producing X-ray computed tomography. To this aim the absolute luminescence efficiency (emitted light flux over X-ray exposure), the spectral matching factor (compatibility to optical detectors), and the effective efficiency (the product of absolute efficiency and spectral compatibility) were determined for X-ray tube voltages ranging from 20 to 140 kV. The efficiency of GSO:Ce was found to increase with increasing X-ray tube voltage, while the GSO:Ce spectrum, peaking at 440 and 490 nm, was found compatible to most optical detectors (photodiodes, photocathodes, and charge-coupled devices). [ABSTRACT FROM AUTHOR]- Published
- 2005
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