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Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons

A plastic scintillator and neutron technology, applied in the field of radiation measurement, can solve the problems of multi-photon, loss, detection efficiency and sensitivity decline, and achieve the effect of wide application range and low cost

Active Publication Date: 2017-01-11
CHINA INST FOR RADIATION PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the ZnS:Ag film is opaque, the method of embedding the ZnS:Ag film in the plastic scintillator will lose a lot of photons, resulting in a decrease in detection efficiency and sensitivity

Method used

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  • Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons
  • Plastic scintillator doped with neutron-sensitive material uranium and method thereof for measuring thermal neutrons

Examples

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Embodiment

[0017] The uranium-doped plastic scintillator is made of polystyrene mixed with uranium-containing raw materials as a matrix, mixed with scintillation substances and wave-shifting agents, and the specific preparation method is to use polystyrene containing a corresponding proportion of U3O8 as a matrix to add The first solute p-triple toluene and the second solute PoPo are post-polymerized to form a uranium-doped plastic scintillator block, and then cut into shape to obtain a uranium-doped plastic scintillator.

[0018] Such as figure 1 Shown is the reaction that occurs when neutrons are incident into the uranium-doped plastic scintillator; the uranium-doped plastic scintillator is connected with the optical collection system, the photoelectric device (such as photomultiplier tube) for detecting light, and the power supply for each electrode of the photomultiplier tube The voltage divider is enclosed in an opaque shell to form a probe, and the internal structure of the probe i...

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Abstract

The invention belongs to the field of radiation measurement, and particularly relates to a plastic scintillator doped with the neutron-sensitive material uranium and a method thereof for measuring thermal neutrons. According to the invention, uranium-contained raw materials are added into the plastic scintillator. The uranium-doped plastic scintillator and a photomultiplier tube are connected and are sealed inside an opaque housing so as to form a probe. The probe is placed in a measurement environment and the nuclear reaction occurs between incident neutrons and the uranium-contained raw materials in the plastic scintillator, so that the materials are in an excited state. During de-excitation, photons are sent out. The number of photons is proportional to the number of incident neutrons. Meanwhile, through recording the electrical impulses semaphore of the photomultiplier tube per unit time, the neutron fluence can be calculated, so that the measurement of the neutron fluence is realized. The neutron fluence is multipled by a fluenc-dose conversion coefficient to obtain the neutron dose equivalent. The plastic scintillator and the method are low in cost, wide in application range and high in detection efficiency.

Description

technical field [0001] The invention belongs to the field of radiation measurement, in particular to a plastic scintillator doped with neutron-sensitive material uranium and a method for measuring thermal neutrons. Background technique [0002] Plastic scintillators are generally made of polystyrene as a matrix, mixed with other organic additives as scintillating substances, and made of wave shifting agents. It has high detection efficiency, high light output, narrow signal pulse width, good processability, Due to the advantages of strong environmental adaptability, stable mechanical properties, and low cost, it is widely used in radiation measurement work. However, since the main components of plastic scintillators are C, H, and O, their interaction with neutrons is relatively low, and generally cannot It is directly used in the field of neutron monitoring. Therefore, when detecting neutrons, other materials need to be doped or embedded to increase the output of optical sig...

Claims

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Application Information

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IPC IPC(8): G01T3/06
Inventor 刘建忠杨明明宋嘉涛王勇任俊李建伟于潜赵迎喜
Owner CHINA INST FOR RADIATION PROTECTION
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