Phosphor, radiation detector containing the same, and X-ray CT apparatus

摘要

A novel phosphor represented by the general formula(wherein y, z and d are values falling in the ranges of 0.0005<=y<=0.05, 0<z<=0.03 and 0<d<5) is provided by adding scandium (Sc) to a phosphor represented by the general formula of (Gd1-yCey)3Al5-dGadO12 (wherein y and d are values falling in the ranges of 0.0005<=y<=0.02 and 0<d<5). The phosphor has a high luminous efficiency and a very small afterglow. A radiation detector using this phosphor as ceramic scintillator is capable of obtaining a high luminous output and suitable for a radiation detector of X-ray CT because of its high luminous output and a very small afterglow.