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Intrinsic luminous halide scintillation crystal and preparation method and application thereof

A technology of scintillation crystals and halides, which is applied in chemical instruments and methods, luminescent materials, crystal growth, etc., can solve the problems of reducing material energy resolution, scintillation performance degradation, instability, etc., and achieve high scintillation luminescence efficiency and high energy Effects of Resolution, High Lattice Integrity

Inactive Publication Date: 2022-01-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But LaBr 3 :Ce material exists 138 La radioactive background affects its performance when identifying weak radiation sources, while SrI 2 : Eu material has a strong self-absorption effect, and the scintillation performance will be significantly reduced when the crystal size is large
In addition, similar to NaI:Tl, these two materials have strong deliquescence and are very unstable in the atmospheric environment, which greatly increases the preparation cost and application difficulty.
[0005] The above-mentioned scintillation materials all have the widespread disadvantage of deliquescence in the air, which is a widespread halide scintillator. Due to this shortcoming, halide scintillator crystals often need to be tightly packaged before they can be used, which has great impact on material storage and The cost of the application has a large impact
At present, the non-(or weak) deliquescent halide scintillators that are widely used are mainly thallium-doped cesium iodide (CsI:Tl + ), this material has a high light output comparable to NaI:Tl and is cheap, but its long afterglow limits its application in high-resolution imaging
CsI: Tl crystal also has the problem of luminous non-uniformity, which is due to the fact that Tl + Due to the segregation of the ions, there is a non-uniform distribution in the whole crystal, which leads to the non-uniform scintillation performance of the crystal.
This shortcoming is common to all doped luminescent scintillation crystals, which will inevitably reduce the final energy resolution of the material

Method used

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  • Intrinsic luminous halide scintillation crystal and preparation method and application thereof
  • Intrinsic luminous halide scintillation crystal and preparation method and application thereof
  • Intrinsic luminous halide scintillation crystal and preparation method and application thereof

Examples

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Embodiment 1

[0041] The intrinsic halide scintillation crystal proposed in this embodiment 1 has a chemical formula of CsCu 2 I 3 , namely (A 1-x A' x )(B 1- y B' y ) 2 (X 1-z X' z ) 3 Is general formula; A=Cs; B=Cu; X=I; x=y=z=0.

[0042] The above-mentioned rare earth halide mixed scintillation crystal is prepared by a crucible descent method, which includes the following steps:

[0043] a) The intrinsic halide scintillator composition chemical formula CsCu prepared on demand 2 I 3 Weigh each raw material. For specific operations, follow the CsCu 2 I 3 Weighing the high-purity raw materials CsI and CuI with a purity of 99.99% in molar ratio;

[0044] b) In an inert gas environment, place each raw material in a quartz crucible with a capillary bottom; then evacuate the inside of the crucible and seal it by welding. In this embodiment, the inert gas environment is a glove box filled with argon or nitrogen;

[0045] c) Place the welded quartz crucible vertically in the midd...

Embodiment 2

[0049] The intrinsic halide scintillation crystal proposed in Example 2 has a chemical formula of Cs 3 Cu 2 I 5 , namely (A 1-x A' x ) 3 (B 1- y B' y ) 2 (X 1-z X' z ) 5 Is general formula; A=Cs; B=Cu; X=I; x=y=z=0.

[0050] The above-mentioned rare earth halide mixed scintillation crystal is prepared by a crucible descent method, which includes the following steps:

[0051] a) Intrinsic halide scintillator composition chemical formula Cs prepared on demand 3 Cu 2 I 5 Weigh each raw material. For specific operations, follow the CsCu 2 I 3 Weighing the high-purity raw materials CsI and CuI with a purity of 99.99% in molar ratio;

[0052] b) In an inert gas environment, place each raw material in a quartz crucible with a capillary bottom; then evacuate the inside of the crucible and seal it by welding. In this embodiment, the inert gas environment is a glove box filled with argon or nitrogen;

[0053] c) Place the welded quartz crucible vertically in the midd...

Embodiment 3

[0057] The intrinsic halide scintillation crystal proposed in this example has the chemical formula of CsCu 2 Br 3 , namely (A 1-x A' x )(B 1- y B' y ) 2 (X 1-z X' z ) 3 It is a general formula; A=Cs; B=Cu; X=Br; x=y=z=0.

[0058] The above-mentioned rare earth halide mixed scintillation crystal is prepared by a crucible descent method, which includes the following steps:

[0059] a) The intrinsic halide scintillator composition chemical formula CsCu prepared on demand 2 Br 3 Weigh each raw material. For specific operations, follow the CsCu 2 Br 3 Weighing the high-purity raw materials CsBr and CuBr with a purity of 99.99% in molar ratio;

[0060] b) In an inert gas environment, place each raw material in a quartz crucible with a capillary bottom; then evacuate the inside of the crucible and seal it by welding. In this embodiment, the inert gas environment is a glove box filled with argon or nitrogen;

[0061]c) Place the welded quartz crucible vertically in t...

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Abstract

The invention relates to an intrinsic luminous halide scintillation crystal as well as a preparation method and application thereof. The intrinsic luminous halide scintillation crystal has the composition general formula of AB2X3, A2BX3 and A3B2X5, wherein A is at least one of Li, Na, K, Rb, Cs, In and Tl; B is at least one of Cu, Ag and Au; X is at least one of F, Cl, Br and I.

Description

technical field [0001] The invention relates to an intrinsically luminescent halide scintillation crystal and its preparation method and application, in particular to an intrinsically luminescent AB 2 x 3 、A 2 BX 3 and A 3 B 2 x 5 The scintillation crystal and its preparation method and application belong to the technical field of scintillation materials. Background technique [0002] A scintillator is a material that can convert high-energy rays or particles into visible light or ultraviolet light, and has a wide range of applications in the field of radiation detection. With the continuous improvement of the performance requirements of radiation detection materials in the fields of homeland security, nuclear medical imaging, and high-energy physics, it is urgent to develop new high-performance scintillators. [0003] At present, the scintillator used in the field of security inspection in the world is sodium iodide doped with thallium (NaI:Tl + ) as a widely used s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B11/00C30B28/06C30B29/12C09K11/61
CPCC30B11/00C30B28/06C30B29/12C09K11/616
Inventor 吴云涛成双良任国浩
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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