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LiF-CaF2: Eu-based organic/inorganic composite scintillator and preparation method and application thereof

Pending Publication Date: 2022-03-11
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

thermal neutron blanket 6 The energy absorbed by Li to generate α particles can only be transferred to CaF 2 :Eu particles can emit flashing light, due to LiF and CaF 2 : Eu powder is a solid particle separated from each other, the particle gap is relatively large, and there may be a liquid glass resin partition between the two, and the charged α particles have a range of about tens of μm in the solid, making this thermal neutron absorption and scintillation The energy transfer efficiency between luminescent solid particles is very low, resulting in weak luminescence and low thermal neutron detection efficiency of the hybrid scintillator prepared by this method
In addition, liquid glass resin, LiF and CaF are used in the production of this type of scintillator 2 :Eu particles will gradually precipitate due to gravity, and may become opaque again, limiting LiF, CaF 2 : Practical application of Eu and liquid glass resin mixture scintillator in the field of thermal neutron detection and imaging

Method used

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  • LiF-CaF2: Eu-based organic/inorganic composite scintillator and preparation method and application thereof
  • LiF-CaF2: Eu-based organic/inorganic composite scintillator and preparation method and application thereof
  • LiF-CaF2: Eu-based organic/inorganic composite scintillator and preparation method and application thereof

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Experimental program
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Embodiment 1

[0049] (1) According to the stoichiometric ratio of 80:20:0.02, fully dried LiF (43.42g), CaF 2 (32.56g) and EuF 3 (0.0871g) Weigh the powder raw material, and add 0.6wt% polytetrafluoroethylene powder as a deoxidizer, and then fully mix these powders in a planetary mixer to obtain a mixed powder;

[0050] (2) Put the mixed powder into the crucible, then directly seal the crucible and place it in the tube furnace, extract the tube furnace to vacuum, then raise the temperature to 650 °C at a rate of 4 °C / hour, and heat it up after 2 hours to 1000°C, and maintain the temperature for sintering for 2 hours;

[0051] (3) Cool down to room temperature to obtain bulk LiF-CaF 2 : Eu inorganic scintillator, use deionized water and alcohol to remove impurities on the surface;

[0052] (4) Grinding the massive inorganic scintillator in a mortar, filtering out impurities and scintillator particles whose particle size does not meet the requirements through a nylon sieve, to obtain an in...

Embodiment 2

[0058] LiF-CaF in this embodiment 2 2 : The preparation process of the Eu composite scintillator refers to Example 1, the difference is: LiF-CaF 2 : The filling amount of Eu inorganic scintillator powder is 10%.

Embodiment 3

[0060] LiF-CaF in this embodiment 3 2 : The preparation process of the Eu composite scintillator refers to Example 1, the difference is: LiF-CaF 2 : The filling amount of Eu inorganic scintillator powder is 20%.

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Abstract

The invention relates to a LiF-CaF2: Eu-based organic / inorganic composite scintillator as well as a preparation method and application of the LiF-CaF2: Eu-based organic / inorganic composite scintillator. The LiF-CaF2: Eu-based organic / inorganic composite scintillator comprises an organic matrix and a powdery LiF-CaF2: Eu inorganic scintillator which is dispersed in the organic matrix, the chemical composition of the powdery LiF-CaF2: Eu inorganic scintillator is (100-x) LiF.xCaF2. YEuF2, wherein x is more than or equal to 5 and less than or equal to 95, and y / x is more than or equal to 0.001% and less than or equal to 2%.

Description

technical field [0001] The invention relates to a LiF-CaF 2 : Eu-based organic / inorganic composite scintillator and its preparation method and application, specifically a powdery LiF-CaF 2 The invention relates to a composite scintillator formed by uniformly dispersing Eu inorganic scintillator into an organic matrix and its preparation method and application, belonging to the field of scintillator for radiation detection. Background technique [0002] With the in-depth research and application of thermal neutron technology, the demand for thermal neutron detection materials in various countries in the world is increasing in terms of quantity and function, and higher requirements are also put forward for thermal neutron detection materials: 1) 2) High light output; 3) Good energy resolution; 4) High α / β ratio; 5) High physical and chemical stability; 6) Low preparation cost. [0003] Commonly used thermal neutron detection materials are 3 He gas, 6 LiF / ZnS:Ag mixed powde...

Claims

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Application Information

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IPC IPC(8): G01T1/20
CPCG01T1/20
Inventor 陈俊锋宗舜和李翔陆裕贵齐雪君杜勇王绍涵
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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