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Scintillation crystal, and preparation method and application thereof

A scintillation crystal and crystal growth technology, applied in crystal growth, chemical instruments and methods, self-solidification method, etc., can solve the problems of weakening the comprehensive advantages and influence of cesium iodide scintillation crystals, and poor crystal light yield.

Inactive Publication Date: 2020-08-28
上海御光新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-doping of the above ions does have a certain effect on the suppression of the afterglow intensity of the crystal, but when the afterglow is reduced, the light yield of the crystal is also significantly reduced, which has a negative impact on the light yield of the crystal and greatly weakens the iodide. Comprehensive advantages of cesium scintillation crystals

Method used

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  • Scintillation crystal, and preparation method and application thereof
  • Scintillation crystal, and preparation method and application thereof
  • Scintillation crystal, and preparation method and application thereof

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preparation example Construction

[0033] The second aspect of the present invention provides the preparation method of the scintillation crystal described in the first aspect of the present invention, comprising: after heating and melting the mixture of cesium iodide powder, thallous iodide and cuprous iodide, further crystal growth , prepared to obtain.

[0034] In the preparation method of scintillation crystal provided by the present invention, the molar ratio of cesium iodide powder to thallium iodide is 1:0.05-0.1. In some specific embodiments, the molar ratio of cesium iodide powder to thallium iodide is 1:0.05-0.06; 1:0.06-0.07; 1:0.07-0.08; 1:0.08-0.09; 1:0.09 ~0.1;1:0.05~0.07;1:0.07~0.09;1:0.05~0.08;1:0.08~0.10;1:0.05~0.09;1:0.06~0.09;1:0.06~0.08;or 1:0.07~ 0.1.

[0035] In the preparation method of the scintillation crystal provided by the present invention, the molar ratio of the cesium iodide powder to the cuprous iodide is 1:0.01-0.1. In some specific embodiments, the molar ratio of cesium iodi...

Embodiment 1

[0052] 1. Weigh 10Kg of high-purity (4N) cesium iodide raw material into the quartz crucible in the self-developed vacuum sublimation desublimation purification tank, turn on the vacuum pump, when the vacuum degree in the tank is higher than 1.0×10 －2 At Pa, start to heat up to 170°C and keep the temperature until the sublimation of the cesium iodide raw material is completed, and the maximum heating temperature of the quartz crucible containing the material does not exceed 175°C;

[0053] 2. Take out the cesium iodide material that has been sublimated and desublimated in step 1 and put it into a quartz tube coated with carbon film. After vacuuming, perform the first crystal growth, and remove about one-fifth of the top of the grown crystal material to be used later;

[0054] 3. Dissolve the crystallization material in step 2 into pure water at a constant temperature of 40°C to form a cesium iodide saturated solution, and add hydroxylamine (NH 2 OH), and use hydrazine hydrate...

Embodiment 2

[0063] 1. Weigh 10Kg of high-purity (4N) cesium iodide raw material into the quartz crucible in the self-developed vacuum sublimation desublimation purification tank, turn on the vacuum pump, when the vacuum degree in the tank is higher than 1.0×10 －2 At Pa, start to heat up to 170°C and keep the temperature until the sublimation of the cesium iodide raw material is completed, and the maximum heating temperature of the quartz crucible containing the material does not exceed 175°C;

[0064] 2. Take out the cesium iodide material that has been sublimated and desublimated in step 1 and put it into a quartz tube coated with carbon film. After vacuuming, perform the first crystal growth, and remove about one-fifth of the top of the grown crystal material to be used later;

[0065] 3. Dissolve the crystallization material in step 2 into pure water at a constant temperature of 50°C to form a cesium iodide saturated solution, and add hydroxylamine (NH 2 OH), and use hydrazine hydrate...

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Abstract

The invention relates to the technical field of artificial scintillation crystals, and concretely relates to a scintillation crystal, and a preparation method and application thereof. The chemical formula of the scintillation crystal is CsI:T1(x):Cu(y), wherein x is more than or equal to 0.05 and less than or equal to 0.1; and y is more than or equal to 0.01 and less than or equal to 0.1. The cesium iodide crystal prepared by adopting a co-doping formula and an improved descending method not only can keep the original light yield, but also can effectively reduce the afterglow, particularly, the afterglow in the first 50 ms time period after irradiation rays are turned off is remarkably improved, and the requirement of high-speed ray imaging detection can be met.

Description

technical field [0001] The invention relates to the technical field of artificial scintillation crystals, in particular to a scintillation crystal and its preparation method and application. Background technique [0002] The detector component is mainly composed of photodiodes and scintillators, and is an important part of radiation detection devices such as security inspection machines, industrial CT machines, and computerized tomography scanners. The scintillator in the detector emits visible light after absorbing high-energy rays, and its performance greatly affects the overall performance index and detection effect of the radiation detection device. The current scintillators are mainly artificial crystals. At present, cesium iodide crystal is the most widely used in X-ray security inspection equipment and industrial CT machines in the world. [0003] Cesium iodide crystal is a kind of halide scintillator with excellent performance. Its light output is 85% of that of so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00G01T1/202
CPCC30B11/00C30B29/12G01T1/202G01T1/2023
Inventor 唐华纯李中波张亮
Owner 上海御光新材料科技股份有限公司
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