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Polycrystalline scintillator for detecting soft x-rays

An X-ray and scintillator technology, which is applied in the field of polycrystalline scintillator for soft X-ray detection, can solve the problems of toxicity, price, characteristic deviation, and insufficient X-ray luminous intensity, and achieve large absorption coefficient, less afterglow, The effect of small absorption coefficient

Active Publication Date: 2013-01-09
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the X-ray luminous intensity of YAG:Ce is not sufficiently high, and ZnSe(Te) has excellent luminous intensity and afterglow characteristics, but its characteristics vary greatly, and it is toxic and expensive

Method used

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  • Polycrystalline scintillator for detecting soft x-rays
  • Polycrystalline scintillator for detecting soft x-rays
  • Polycrystalline scintillator for detecting soft x-rays

Examples

Experimental program
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Effect test

Embodiment 1

[0070] In a resin kettle with a capacity of 1 liter, together with 1300 g of high-purity alumina balls with a diameter of 5 mm and 200 cc of ethanol, the Al from the alumina balls was considered. 2 O 3 In the case of mixing, put 73.79g of Y 2 O 3 Powder, 29.80g Gd 2 O 3 Powder, 0.77g CeO 2 Powder, 38.16g of Al 2 O 3 Powder and 57.48g of Ga 2 O 3 A total of 200 g of raw material powder composed of powder. In order to reduce the content of Fe and Si, the Al 2 O 3 The powder was preliminarily heat-treated in a vacuum (10 Pa or less) at 1400° C. for 1 hour, and then pulverized by a ball mill for 12 hours. After mixing the raw material powder in a wet ball mill for 12 hours, drying was performed. The mass change of the alumina balls mixed by the wet ball mill was 0.06 g. The average particle diameter of the wet ball mill mixed powder determined by using a laser diffraction particle size distribution analyzer (LA920 manufactured by Horiba, Ltd.) and having an average re...

Embodiment 2

[0075] Use Y from 73.61g 2 O 3 Powder, 29.73g of Gd 2 O 3 Powder, 0.706g CeO 2 Powder, 38.26g of Al 2 O 3 Powder and 57.64g of Ga 2 O 3 A polycrystalline scintillator of Example 2 having the composition shown in Table 2 was produced in the same manner as in Example 1, except that the raw material powder was composed of powder.

Embodiment 3

[0077] Use Y from 75.47g 2 O 3 Powder, 30.48g Gd 2 O 3 Powder, 0.724g CeO 2 Powder, 37.21g of Al 2 O 3 Powder and 56.05g of Ga 2 O 3 A polycrystalline scintillator of Example 3 having the composition shown in Table 2 was produced in the same manner as in Example 1 except that the raw material powder was composed of powder.

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Abstract

A polycrystalline scintillator for detecting soft X-rays contains Ce as a light-emitting element, and at least Y, Gd, Al, Ga and O, has a garnet crystal structure, and has a composition represented by the following general formula: (Y1-x-zGdxCez)3+a(Al1-uGau)5-aO12(wherein 0< = a <= 0.1, 0.15< = x< = 0.3, 0.002 <= z <= 0.015, and 0.35 <= u <= 0.55) The Fe content is 0.05 to 1 ppm by mass exclusively; the Si content is 0.5 to 10 ppm by mass exclusively; the [mu]50 / [mu]100 ratio of the absorption coefficient of a 50 KeV X-ray ([mu]50) to the absorption coefficient of a 100 KeV X-ray ([mu]100) is at least 3; and the afterglow 3 ms after the X-rays have stopped is not more than 800 ppm.

Description

technical field [0001] The present invention relates to a polycrystalline scintillator for soft X-ray detection which has a large soft X-ray absorption coefficient and a small hard X-ray absorption coefficient, and has high luminous intensity but small afterglow. Background technique [0002] An X-ray CT (Computed Tomography) apparatus includes an X-ray tube that irradiates a fan-shaped fan-beam X-ray, and an X-ray detector in which a plurality of X-ray detection elements that detect the fan-beam X-ray are arranged in parallel, and the detection angle is different for each tomographic plane. The obtained X-ray absorption data are analyzed by computer to calculate the X-ray absorption rate of each position in each tomographic plane, thereby forming the image of each tomographic plane. [0003] As an X-ray detector, a practical detector is a combination of single crystal CdWO 4 Ceramic, (Y, Gd) 2 O 3 : Ceramics composed of Eu, Pr, Gd 2 O 2 A scintillator such as a ceramic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80C09K11/00G01T1/20G01T1/202
CPCC09K11/7771G21K4/00C09K11/7774
Inventor 中村良平田中谦弥上田俊介
Owner PROTERIAL LTD
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