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Gadolinium oxysulfide scintillation ceramic preparation method

A technology of scintillating ceramics and gadolinium oxysulfide, which is applied in the measurement of chemical instruments and methods, instruments, and radiation, and can solve the problems of high hot pressing pressure, difficulty in obtaining, and limited application

Inactive Publication Date: 2016-03-30
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preferred parameters of this method require a hot pressing pressure as high as about 200-250 MPa, and molds with such a high pressure resistance are usually expensive and not easy to obtain
This limits the application of this method

Method used

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  • Gadolinium oxysulfide scintillation ceramic preparation method
  • Gadolinium oxysulfide scintillation ceramic preparation method
  • Gadolinium oxysulfide scintillation ceramic preparation method

Examples

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preparation example Construction

[0018] In order to overcome one or more defects of the prior art, the invention provides a preparation method of GOS scintillation ceramics, which comprises the following steps:

[0019] 1) To Gd with a median particle size of 5-9 μm 2 o 2 S: Pr, Ce scintillation ceramic powder with sintering aid added. Preferably, the powder is commercially available, and its purity is not less than 99.995%, preferably not less than 99.999%; it is also preferred that the doping amount of Pr ions is 500-800ppm in mass content, and the doping amount of Ce ions is The amount is 10-50ppm in mass content. In addition, preferably wherein the sintering aid is LiF and / or Li 2 GeF 6 ; The addition of the sintering aid is 0.02-1%, preferably 0.1-1%, based on the mass of the scintillation ceramic powder. The mixed powder is ball milled to make it uniformly mixed, and optionally refined to obtain a powder containing a sintering aid. Preferably said ball milling is carried out on a planetary ball mi...

Embodiment 1-5

[0040] Weigh 100 g of commercial Gd with a particle size of 4.0 μm for d(0.1), 6.8 μm for d(0.5) and 10.1 μm for d(0.9) with a purity of 99.999% 2 o 2 S:Pr, Ce scintillation ceramic powder, add 0.2gLi 2 GeF 6 As a sintering aid, put a polyurethane ball mill tank with an inner diameter of 100 mm and a height of 100 mm in an argon gas box, add 500 g of high-density yttrium oxide reinforced zirconia grinding balls with graded sizes, add 300 mL of MOS grade high-purity absolute ethanol, and place For the planetary ball mill, at a speed of 500 rpm, the ball mill was mixed for 1 hour, and the forward and reverse directions were run for 0.5 hours each.

[0041] The polyurethane ball mill jar and zirconia balls need to be pre-cleaned. The specific method is as follows: Put 500g of high-density yttria-strengthened zirconia balls into the ball mill jar, including 35g of balls with a diameter of 10mm, 105g of balls with a diameter of 6mm, and 360g of balls with a diameter of 3mm. , ad...

Embodiment 6、7

[0046] The scintillation powder was ball milled and mixed in the same manner as in Examples 1-5 to obtain powders with the same particle size distribution. Put the powder into a carbon fiber composite material mold with an inner diameter of 50 mm, and perform vacuum hot pressing for one-time sintering. The temperature is at 1500 and 1550°C respectively, the pressure is 200MPa, and the vacuum is 5×10 -2 Pa, heat preservation and pressure for 2 hours. After the heat preservation is over, execute the cooling program, the cooling rate is 5°C / min, and take it out after it is completely cooled to room temperature, which is the GOS primary sintered body. The same annealing and hot isostatic pressing methods as in Examples 1-5 were used for secondary sintering and post-treatment to obtain GOS:Pr, Ce, F scintillation ceramics.

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Abstract

The present invention relates a low-cost two-step-sintering preparation method of gadolinium oxysulfide (GOS with the chemical formula of Gd2O2S) scintillation ceramic doped with at least one element of Pr, Ce, Tb and Eu, and the method includes hot uniaxial pressing and hot isostatic-pressing secondary sintering.

Description

technical field [0001] The present invention relates to gadolinium oxysulfide (GOS, having the general chemical formula Gd) doped with at least one element of Pr, Ce, Tb, Eu 2 o 2 S) A low-cost two-step sintering method for scintillation ceramics, including primary sintering by uniaxial hot pressing and secondary sintering by hot isostatic pressing. [0002] The present invention further relates to scintillation ceramics prepared by the method of the present invention and their use in detectors for electromechanical ionizing radiation of security items. Background technique [0003] GOS doped with rare earth ions (chemical formula Gd 2 o 2 S) Ceramic scintillators compared to traditional CsI, CdWO 4 Iso-scintillation single crystal has the advantages of high density, high light yield, stable chemical properties, relatively simple preparation process, and no cleavage during processing. Or the scintillator material that is ideal for the detector and has the best comprehen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/645G01T1/202
CPCC04B35/547C04B35/62615C04B35/6455C04B2235/3224C04B2235/445C04B2235/5436C04B2235/5463C04B2235/604C04B2235/656C04B2235/6565C04B2235/662C09K11/7771C04B35/6303C04B35/645G01T1/2935
Inventor 王燕春张清军李元景陈志强赵自然刘以农刘耀红常建平赵书清张文剑王永强
Owner TSINGHUA UNIV
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