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Preparation method of non-lead copper-based halide scintillator film

A halide and scintillator technology, used in the field of X-ray detection and indirect detection, can solve the problems of reducing the resolution and sensitivity of X-ray imaging, difficult to store nanocrystals stably for a long time, and limiting the wide application of traditional scintillators. Best spectral matching, wide applicability, high light yield effect

Pending Publication Date: 2021-03-05
EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But there are still some problems, such as serious light scattering of gadolinium oxysulfide GOS scintillator, and long fluorescence lifetime of cesium iodide CsI:Tl scintillator doped with thallium, thus greatly reducing the resolution and sensitivity of X-ray imaging. In addition, cesium iodide CsI ​​needs to be doped with the toxic chemical element thallium (Tl), these shortcomings greatly limit the wide application of traditional scintillators
[0005] For perovskite CsPbX 3 There are still three major problems restricting the development of nanocrystalline scintillators: one is that the preparation process (hot injection method) is relatively complicated; the other is that it has heavy metal toxicity (including lead, Pb), and Pb elements will cause environmental pollution; Poor, CsPbX 3 Nanocrystals are difficult to store stably for a long time

Method used

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  • Preparation method of non-lead copper-based halide scintillator film
  • Preparation method of non-lead copper-based halide scintillator film
  • Preparation method of non-lead copper-based halide scintillator film

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preparation example Construction

[0043] According to a typical embodiment of the present invention, a method of preparing a non-lead copper halide scintillator film, such as figure 1 The following steps are included:

[0044] S100 mixes the alkali metal halide AX and the alkali metal copper CUX, and hydrazine acid and reduction protectants are added to the mixture.

[0045] S200 heat dissolves the mixture to give the precursor solution, and the organic solvent is added thereto, and it is repeatedly rinsed.

[0046] The S300 obtains a copper-based halide scintillator crystal by vacuum drying.

[0047] The S400 copper-based halide scintillator crystal is polished into a powder.

[0048] The S500 is made into a copper-based halide scintillator crystal by hot press.

[0049] Among them, the reducing protective agent is hypophosphoric acid, and the organic solvent is isopropyl alcohol.

[0050] Such as figure 2 The preparation method of a non-lead copper-based halide scintillator film provided by the present inventio...

Embodiment 1

[0071] The RBCL and Cucl mixture were added to dilute hydrochloric acid, and the pellet was 0.16 mol / L, and then the mixed solution volume of 2% hypochlorlic acid was reduced, heated to form a transparent solution, and then 5 degrees Celsius per minute , Slow down to the solution, RB 2 Cucl 3 Due to the decrease in solubility, crystals were precipitated, rinsed with isopropanol and then dried in vacuo, thereby preparing RB 2 Cucl 3 Crystals.

[0072] RB will be made 2 Cucl 3 Crystals are polished into powder, and the powder particle size is less than 1 microns, and RB will 2 Cucl 3 The crystal powder is tiled on the quartz piece, then placed in the heat source heating, to be RB 2 Cucl 3 The crystal powder is melted, placing another preheated quartz sheet on the sparkle melt, and applies 0.1 MPa Pressure, cooling to normal temperature, removes quartz sheets, from RB 2 Cucl 3 Scintillator membrane.

Embodiment 2

[0074] The CSBR and CUBR mixture were added to the HBR solution, and the mixed solution was 0.16 mol / L, and then the mixed solution volume of 2% hypochlorous acid was reduced, and the transparent solution was heated, and the reduction of 5 degrees Celsius per minute, Slowly cool down for solution, CS 3 Cu 2 Br 5 Due to the decrease in solubility, the crystal is precipitated, flushing multiplexes with isopropanol and then drying in vacuo, thereby preparing CS 3 Cu 2 Br 5 Crystals.

[0075] CS will be made 3 Cu 2 Br 5 The crystal grinding into a powder, the powder particle size is less than 1 micron, and the CS will be 3 Cu 2 Br 5 The crystal powder is tiled on the quartz piece, and then placed in a heat source heating, to be CS 3 Cu 2 Br 5 The crystal powder is melted, and the other preheated aspage-resistant sheet is placed on the sparkle melt, and 0.4 MPa pressure is applied, after cooling to normal temperature, remove the quartz sheet, from CS 3 Cu 2 Br 5 Scintillator membrane...

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Abstract

The invention provides a preparation method of a non-lead copper-based halide scintillator film, which comprises the following steps: preparing copper-based halide crystal AxCuyXz powder, and paving the powder on a first matrix; heating the first matrix to obtain a copper-based halide crystal powder melt; preheating a second matrix, covering the copper-based halide crystal powder melt with the second matrix, and applying pressure to the non-lead copper-based halide crystal powder melt; and after cooling, removing the first matrix and the second matrix to obtain a copper-based halide scintillator film, wherein the first matrix and the second matrix are both high-temperature-resistant matrixes. The hot pressing method is simple to operate, universal and low in cost, and the prepared scintillator film is excellent in performance, free of heavy metal lead, non-toxic and free of environmental pollution.

Description

Technical field [0001] The present invention relates to the field of X-ray detection, and more particularly to a method for preparing a copper-based halide scintillator film in an indirect detection. Background technique [0002] The X-ray detector is divided into direct detection and indirect detection according to the core material and the detection mechanism. The indirect detection is based on the scintillator to convert the absorbed X-rays into visible photon, and then use the photodetector to achieve X-ray detection and imaging. The X-ray indirect detection has the advantages of fast response speed, low preparation cost, and reliable and reliable, and thus the mainstream of the current application. [0003] Conventional scintillats have thiol oxide (GOS) and blended iodide (CSI: TL), which have the advantages of low cost and high imaging resolution, and is currently commercially distributed. Scintillator. In recent years, new scintillat based on perovskite is widely studied,...

Claims

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Application Information

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IPC IPC(8): C09K11/61
CPCC09K11/616
Inventor 唐江赵雪
Owner EZHOU INST OF IND TECH HUAZHONG UNIV OF SCI & TECH
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