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Gadolinium oxysulfide sintered body, and scintillator, scintillator array, radiation detector, and radiation inspection apparatus including gadolinium oxysulfide sintered body

A technology of gadolinium oxysulfide and sintered body, which is applied in the field of scintillators, can solve the problems of X-ray sensitivity reduction and achieve high sensitivity

Pending Publication Date: 2019-09-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The resolution of these X-ray diagnostic images is improved by downsizing each ceramic scintillator included in the scintillator array, but on the other hand, there is a problem that the sensitivity to X-rays decreases.

Method used

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  • Gadolinium oxysulfide sintered body, and scintillator, scintillator array, radiation detector, and radiation inspection apparatus including gadolinium oxysulfide sintered body
  • Gadolinium oxysulfide sintered body, and scintillator, scintillator array, radiation detector, and radiation inspection apparatus including gadolinium oxysulfide sintered body
  • Gadolinium oxysulfide sintered body, and scintillator, scintillator array, radiation detector, and radiation inspection apparatus including gadolinium oxysulfide sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] ·Sintering process

[0089] Gd with an average particle size of 9 μm on a volume basis 2 o 2 S: The powder of Pr phosphor is sealed in a low-carbon steel capsule, and the HIP treatment is performed at a temperature of 1300 °C and a pressure of 100 MPa for 2 hours to obtain Gd 2 o2 S: Sintered body of Pr.

[0090] Next, the obtained sintered body was processed into a thickness of 6×6×3 mm with a dicing saw to obtain a sintered body sheet.

[0091] ·Annealing process

[0092] Put the obtained sintered body into Gd 2 o 2 S:Pr phosphor powder, in the sintered sheet and Gd 2 o 2 S: Pr phosphor powder was placed in a crucible made of alumina in a state of contact with the phosphor powder, and the crucible was placed in a Taman high-temperature electric furnace SUPER-BURN manufactured by Motoyama Corporation. In an argon (0.3L / min) atmosphere, the temperature was raised to 1100°C at 200°C / hour, and after heat treatment for 10 hours, the temperature was lowered at 200°C...

Embodiment 2～4、 comparative example 1～2

[0102] Using the sintered compact sheet obtained in Example 1, Gd was obtained in the same manner as in Example 1 except that the temperature of the annealing step, the time of the annealing step, and the atmosphere of the annealing step were changed according to Table 1. 2 o 2 S: Pr sintered body.

[0103] [Table 1]

[0104] Table 1

[0105]

[0106] [Table 2]

[0107] Table 2

[0108]

Embodiment 5

[0110] ·Sintering process

[0111] A sintered compact sheet was obtained by the same method as in Example 1.

[0112] ·Annealing process

[0113] Put the obtained sintered body into Gd 2 o 2 S:Pr phosphor powder, in the sintered sheet and Gd 2 o 2 S: Pr phosphor powder was placed in a crucible made of alumina in a state of being in contact with the phosphor powder, and the crucible was placed in a Taman high-temperature electric furnace SUPER-BURN manufactured by Motoyama Corporation. In an argon (0.3L / min) atmosphere, the temperature was raised at 200°C / hour to 1050°C, and after heat treatment for 10 hours, the temperature was lowered at 200°C / hour to obtain Gd after the annealing process. 2 o 2 S: Pr sintered body.

[0114] The annealing process conditions of the sintered body obtained in Example 5, the light output after annealing, and the transmittance T 410 / T 512 , I y / I x Shown in Table 3.

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Abstract

The present invention provides a gadolinium oxysulfide sintered body having high optical output. The problem is overcome by using a gadolinium oxysulfide sintered body comprising at least one augmenting agent selected from the group consisting of praseodymium, terbium, and cerium, wherein the ratio of the light transmittance at 410 nm T410 relative to the light transmittance at 512 nm T510 (T410 / T512) is 0.31 to 0.61, while, in the XRD diffraction pattern, the ratio of the diffraction peak intensity Iy of phases other than gadolinium oxysulfide appearing at 2theta = 20 to 29 degrees relative to the (102) or (011) diffraction peak intensity Ix of gadolinium oxysulfide appearing at 2theta = 30 + / - 1 degrees (Iy / x) is 0.1 or less.

Description

technical field [0001] The present invention relates to a gadolinium oxysulfide sintered body, a scintillator containing the gadolinium oxysulfide sintered body, a scintillator array, a radiation detector, and a radiation inspection device. Background technique [0002] For medical diagnosis and industrial non-destructive inspection, image diagnosis by X-ray transmission imaging or image diagnosis by X-ray CT (Computed Tomography: Computed Tomography) imaging is used. In these image diagnostic devices, in order to convert X-rays into visible light, a member (scintillator array) in which a plurality of ceramic scintillators are arranged in an array (scintillator array) is used. The ceramic scintillator is made of gadolinium oxysulfide ( Gd 2 o 2 S:Pr) (hereinafter also referred to as GOS:Pr) and other rare earth sulfur oxide sintered bodies. [0003] The resolution of these X-ray diagnostic images is improved by downsizing each ceramic scintillator included in the scintill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/547C09K11/00C09K11/08C09K11/84G01N23/046G01T1/20
CPCC04B35/547C09K11/00C09K11/08G01N23/046C09K11/7771
Inventor 羽豆耕治山原圭二片山利昭
Owner MITSUBISHI CHEM CORP
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