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Plastic scintillator for beta ray detection and preparation method thereof

A plastic scintillator and beta ray technology, applied in the field of low-energy nuclear radiation detection material preparation, can solve the problems of low effective cross-sectional area, poor processing performance, invisible cracks, etc., and achieve the effects of uniformity in different positions, stable performance and high detection efficiency

Inactive Publication Date: 2022-07-05
苏州昊唐兴核高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effective cross-sectional area of ​​the interaction between the organic elements of the plastic scintillator and the β-ray is relatively low, and the processing performance of the existing plastic scintillator is poor, and it is easy to break or produce invisible cracks during processing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, the organic solvent used in the present invention dissolves the uniform organic lithium salt, that is, lithium polyacrylate is prepared by the following method:

[0029] (121) Preparation method of lithium polyacrylate: mix acrylic acid and methanol into a reactor at 50°C and stir for 1.5h, then add 0.18% isopropanol and 0.28% azobisisobutyronitrile, and stir under nitrogen protection at 65°C Polyacrylic acid is obtained in 2 h; polyacrylic acid having a molecular weight of 30,000 to 35,000 is mixed and reacted with lithium hydroxide to obtain lithium polyacrylate.

[0030] (123) 0.57% of phthalate and 2.8% of acrylic acid are added to lithium polyacrylate to form organic lithium salt dissolved in organic solvent uniformly.

[0031] Secondly, the preparation method of the plastic scintillator for β-ray detection of the present invention is calculated according to the weight percentage: adding 6% of 2,5-diphenyloxazole, 0.47% 1,4-bis(5-phenyloxazole)benzene, and ...

Embodiment 2

[0041] First, the organic solvent used in the present invention dissolves the uniform organic lithium salt, that is, lithium polyacrylate is prepared by the following method:

[0042] (221) The preparation method of lithium polyacrylate: after diluting a polyacrylic acid solution with a molecular weight of 30,000 to 40,000 and a mass fraction of 37.5% to a polyacrylic acid solution with a mass fraction of 11.5%, and then mixed with lithium hydroxide to react to obtain a polyacrylic acid solution. Lithium acrylate; adding acrylic acid aqueous solution to adjust the pH of lithium polyacrylate to 5-6, ultrasonic frequency 1700Hz, and obtaining lithium polyacrylate when lithium hydroxide is completely dissolved.

[0043] (223) adding 0.58% phthalate and 2.8% acrylic acid to lithium polyacrylate; fully dissolving phthalate and lithium polyacrylate in the acrylic acid aqueous solution to form an organic lithium salt that is uniformly dissolved in an organic solvent.

[0044] Secondl...

Embodiment 3

[0054] First, the organic solvent used in the present invention dissolves the uniform organic lithium salt, that is, lithium polyacrylate is prepared by the following method:

[0055] (321) Preparation method of lithium polyacrylate: mix acrylic acid and methanol into a reactor at 50°C and stir for 1.8h, then add 0.16% of isopropanol and 0.27% of azobisisobutyronitrile, under nitrogen protection at 60~63°C Under stirring for 1.5 h, polyacrylic acid is obtained; polyacrylic acid having a molecular weight of 25,000 to 35,000 is taken and reacted with lithium hydroxide to obtain lithium polyacrylate.

[0056] (323) adding 0.54% phthalate and 2.4% acrylic acid to the lithium polyacrylate; fully dissolving the phthalate and lithium polyacrylate in the aqueous acrylic acid solution to obtain an organic lithium salt that is uniformly dissolved in an organic solvent.

[0057] Secondly, the preparation method of the plastic scintillator for β-ray detection of the present invention is c...

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PUM

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Abstract

The invention provides a plastic scintillator for beta-ray detection, which is prepared by the following steps: by weight, taking polymethylstyrene as a plastic matrix, adding 5.5 to 6.5 percent of 2, 5-diphenyloxazole, then adding 0.45 to 0.55 percent of 1, 4-bis (5-phenyloxazole) benzene and 2.5 to 3.5 percent of organic lithium salt lithium polyacrylate; the polymethylstyrene is formed by polymerizing a mixed monomer of alpha-methylstyrene and 4-methylstyrene; according to the plastic scintillator, a certain amount of sensitizer or modifier is doped, through a preparation method of multiple polymerization, a product with a large size can be manufactured at a time, the plastic scintillator is suitable for batch preparation requirements, the minimum thickness reaches 0.45 mm, and the area of the product reaches 2000 cm < 2 > or above; plastic scintillators with different thicknesses can be polymerized and generated at different thicknesses according to needs, and the plastic scintillators are good in processing flexibility and high in beta ray detection sensitivity.

Description

technical field [0001] The invention relates to the technical field of preparation of low-energy nuclear radiation detection materials, in particular to a plastic scintillator for beta-ray detection and a preparation method thereof. Background technique [0002] In nuclear physics, beta rays are charged, high-speed, low-energy particles released from the radioactive decay of nuclides; in the process of beta decay, the radioactive nucleus is transformed by emitting electrons and neutrinos, and the electrons in the product are destroyed. It is called beta particle; beta ray is more penetrating than alpha ray, and its ionizing effect is weak, and it is widely used in passing the same distance, causing less damage. However, it is necessary to monitor and control beta rays in order to obtain the required data or parameters and achieve safe and effective use. The detection or monitoring materials include inorganic scintillators and organic scintillators, among which plastic scint...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/16C08L33/02C08K5/353C08F212/12
CPCC08L25/16C08F212/12C08K2201/014C08L33/02C08K5/353
Inventor 李向烈
Owner 苏州昊唐兴核高新材料有限公司