IP Library › Granted Patent US 8,969,812
Granted Patent B2
US 8,969,812 · App. 13/982,653 · Granted Mar 3, 2015

Garnet-type crystal for scintillator and radiation detector using the same

Inventors: Akira Yoshikawa (Miyagi, JP); Takayuki Yanagida (Miyagi, JP); Kei Kamada (Ibaraki, JP); Hiroki Sato (Ibaraki, JP); Kosuke Tsutsumi (Ibaraki, JP); Takanori Endo (Ibaraki, JP); Shigeki Ito (Ibaraki, JP)
Assignees: Furukawa Co., Ltd.; Tohoku Techno Arch Co., Ltd.
C09K11/7769C09K11/7774G01T1/202G01T1/2023G21K4/00
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Quick Facts
Patent No.
US 8,969,812
App. No.
13/982,653
Granted
Mar 3, 2015
Kind
B2
Abstract

The garnet-type crystal for a scintillator of the present invention is represented by General Formula (1), (2), or (3), Gd 3-x-y Ce x RE y Al 5-z Ga z O 12   (1) wherein in Formula (1), 0.0001≦x≦0.15, 0≦y≦0.1, 2<z≦4.5, and RE represents at least one selected from Y, Yb, and Lu; Gd 3-a-b Ce a Lu b Al 5-c Ga c O 12   (2) wherein in Formula (2), 0.0001≦a≦0.15, 0.1<b≦3, and 2<c≦4.5; Gd 3-p-q Ce r RE′ q Al 5-r Ga r O 12   (3) wherein in Formula (3), 0.0001≦p≦0.15, 0.1<q≦3, 1<r≦4.5, and RE′ represents Y or Yb.

Claims (46)

1. A garnet-type crystal for a scintillator that is represented by General Formula (1), (2), or (3),

Gd 3-x-y Ce x RE y Al 5-z Ga z O 12   (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,

Gd 3-a-b Ce a Lu b Al 5-c Ga c O 12   (2)

wherein in Formula (2), 0.0001≦a≦0.15, 0.1<b≦3, and 3<c≦4.5,

Gd 3-p-q Ce p RE′ q Al 5-r Ga r O 12   (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 ; and

a 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.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 31, 2013
From: YOSHIKAWA, AKIRA; YANAGIDA, TAKAYUKI; KAMADA, KEI; SATO, HIROKI; ENDO, TAKANORI; TSUTSUMI, KOSUKE; ITO, SHIGEKI
To: FURUKAWA CO., LTD.; TOHOKU TECHNO ARCH CO., LTD.
Reel/Frame 030916/0293 →
Priority Claims (3)
JP 2011-018579 · Jan 31, 2011 · national
JP 2011-018583 · Jan 31, 2011 · national
JP 2011-018586 · Jan 31, 2011 · national
Continuity (1)
Related Publication 20130306874A1 · Nov 21, 2013