| 摘要 |
A fluorescent material for a scintillator to be used in a radiation detector is provided. The fluorescent material is designed to have a high fluorescent intensity and a low level of afterglow a short term of 1 to 300 ms after the termination of X-ray radiation. The above fluorescent material contains Ce as an activator. In addition, the material must contain at least Gd, Al, Ga, O, Fe, and a component M. The component M is at least one of Mg, Ti, and Ni. In addition, the composition of the material must be expressed by the general formula: (Gd1-x-zLuxCez)3+a(Al1-u-sGauScs)5−aO12 wherein 0≦̸a≦̸0.15, 0≦̸x≦̸0.5, 0.0003≦̸z≦̸0.0167, 0.2≦̸u≦̸0.6, and 0≦̸s≦̸0.1, and wherein, regarding the concentrations of Fe and M, Fe: 0.05≦̸Fe concentration (mass ppm)≦̸1, and 0≦̸M concentration (mass ppm)≦̸50.
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