| 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:
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ(Gd 1-x-z Lu x Ce z ) 3+a (Al 1-u-s Ga u Sc s ) 5-a O 12
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.
|
