FLUORESCENT MATERIAL, SCINTILLATOR USING THE FLUORESCENT MATERIAL, AND RADIATION DETECTOR

摘要

Provided is a fluorescent material, which is for a scintillator for a radiation detector, has high emission intensity and a small afterglow after lapse of a short time of 1-10ms after stopping X ray irradiation. In the fluorescent material, Ce is contained as a light emitting element and at least Gd, Al Ga, O and Fe are contained, and M is one or more elements selected from among Mg, Ti and Ni. The fluorescent material is expressed by the following general expression; (Gd1-x-zLuxCez)3+a(Al1-u-sGauScs)5-aO12, and the following inequalities are satisfied; 0=a=0.15, 0=x=0.5, 0.0003=z=0.0167, 0.2=u=0.6 and 0=s=0.1. The additive concentration of Fe is 0.05-1 massppm and that of the M is 0-50 massppm.