Effect of yttria substitution on the light output of (Gd,Y)(2)O-3 : Eu ceramic scintillator

Abstract

For the application of the computed tomography (CT) scanner, Gd1.94-xYxEu0.06O3 ceramic scintillator was prepared. We investigated the effect of the relative contents of Y2O3 for Gd2O3 matrix on the light output properties by the measurements of the emitted light spectra, relative light output, and X-ray diffraction (XRD) patterns. From the measurement results, it was found that maintaining the crystalline structure as cubic phase after sintering process is important to achieve high light output properties on (Gd,Y)(2)O-3 ceramic scintillators, and the scintillation conversion process is more dominant for high light output of cubic phase than the optical transparency. (C) 2004 Elsevier B.V. All rights reserved.