Synthesis and Characterization of Doped Ceramic Scintillators Based on (Gd,Y)/sub 2/O/sub 3/

From the measured X-ray luminescence spectra, the Gd _1.94-x Y _x Eu _0.06 O ₃ ceramics with x=0.4 showed the highest emission luminescence. Also both excitation and emission spectra measured at room temperature were higher than that at 11 K. The decay characteristics measured by laser luminescence showed that the decay time was about 1.2 msec at 11 K and it did not change much by increasing ambient temperature. From the results of the X-ray luminescence spectra measurement, it was also found that Eu and Li co-doping certainly increased the light output in the powder form but substantially the light output decreased in the ceramic form, which was considered due to the creation of defects in the sintering process. Therefore a further tuning procedure of the sintering process worthwhile to investigate for making better (Gd,Y) ₂ O ₃ ceramic scintillator