Patent Number: 
Section: claims

1. A garnet-type crystal for a scintillator that is represented by General Formula (1), (2), or (3),Gd3-x-yCexREyAl5-zGazO12  (1)wherein in Formula (1), 0.0001≦x≦0.15, 0≦y≦0.1, 2.5≦z≦3.5, and RE represents at least one selected from Y and Yb,Gd3-a-bCeaLubAl5-cGacO12  (2)wherein in Formula (2), 0.0001≦a≦0.15, 0.1<b≦3, and 3<c≦4.5,Gd3-p-qCepRE′qAl5-rGarO12  (3)wherein in Formula (3), 0.0001≦p≦0.15, 0.1<q≦3, 1<r≦4.5, and RE′ represents Y or Yb. 2. The garnet-type crystal for a scintillator according to claim 1,wherein a fluorescence component has a fluorescence lifetime of not longer than 100 ns. 3. The garnet-type crystal for a scintillator according to claim 1,wherein the intensity of a long-life fluorescence component having a fluorescence lifetime exceeding 100 ns is not higher than 20% of the intensity of the entire fluorescence components. 4. The garnet-type crystal for a scintillator according to claim 1,wherein a peak emission wavelength of the fluorescence component is equal to or longer than 460 nm and equal to or shorter than 700 nm. 5. The garnet-type crystal for a scintillator according to claim 1,wherein an amount of luminescence is 20,000 photons/MeV or more. 6. A radiation detector comprising:a scintillator constituted with the garnet-type crystal for a scintillator according to claim 1; anda light receiver that detects luminescence from the scintillator. 7. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (1). 8. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (1) and in the Formula (1), RE represents Y. 9. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (1) and in the Formula (1), RE represents Yb. 10. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (1) and in the Formula (1), 0.003≦x≦0.15. 11. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (2). 12. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (2) and in the Formula (2), 0.015≦a≦0.09. 13. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (2) and in the Formula (2), 0.015≦a≦0.09 and 3<c≦4 . . . 0. 14. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3). 15. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), RE′ represents Y. 16. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), RE′ represents Yb. 17. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), 0.015≦p≦0.09. 18. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), 3<r≦4.5. 19. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), 0.5≦q≦3 and 2≦r≦4. 20. The garnet-type crystal for a scintillator according to claim 1,wherein the garnet-type crystal is represented by the General Formula (3) and in the Formula (3), 0.5≦q≦1.5 and 2.5≦r≦3.5.