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Detector for positron annihilation life spectrometer

A positron annihilation and detector technology, which is used in instruments, scientific instruments, material analysis by measuring secondary emissions, etc., can solve problems such as poor time resolution, avoid light and electromagnetic interference, improve time resolution, and improve The effect of detection efficiency

Inactive Publication Date: 2006-02-22
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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Problems solved by technology

That is, E γ1 and E γ2 1.28MeV and 0.511MeV respectively, the energy of the two 0.511MeV gamma rays generated during the annihilation of the positron, one of the energy of the 0.511MeV gamma ray is lost in vain, so E γ2 The smaller the value, the larger the FWHM value, and the poorer the time resolution of the spectrometer

Method used

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  • Detector for positron annihilation life spectrometer
  • Detector for positron annihilation life spectrometer
  • Detector for positron annihilation life spectrometer

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Embodiment Construction

[0052] The present invention is a detector of a positron annihilation lifetime spectrometer. The positron annihilation lifetime spectrometer includes two scintillation detectors; refer to figure 2 and image 3 , figure 2 It is a structural schematic diagram of the initial track detector of the present invention; image 3 It is a structural schematic diagram of the stop track detector of the present invention; the start track detector 1 and the stop track detector 2 respectively comprise a first scintillator 3 and a second scintillator 4, and the start track detector 1 and the stop track detector 2 simultaneously It also includes a CF4 film 16, a photomultiplier tube 5, a corresponding high voltage divider circuit 6 and an outer shell 10 respectively.

[0053] The present invention adopts well-type stop track detector 2, promptly has a circular well 7 in the center of the second scintillator 4 of described stop track detector 2, is used to place sample and when measuring s...

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Abstract

This invention relates to one positron annihilation life spectrum detector, which comprises initial detector and terminal detector and is different to the regular detector by adopting the different terminal channel detector to the initial channel and locating one round well in the center of the flash of the terminal detector and putting specimen and 22Na positron emission power.

Description

technical field [0001] The invention relates to a positron annihilation lifetime spectrometer (Positron Annihilation Lifetime Spectrometer), in particular to a detector of the positron annihilation lifetime spectrometer. Background technique [0002] Positrons are the antiparticles of electrons. When positrons and electrons meet, annihilation occurs, and the entire mass is converted into two gamma photons with energy of 0.511MeV and opposite directions; the annihilation lifetime of positrons is inversely proportional to the electron concentration in the material , in metals and alloys with complete lattices, the annihilation lifetime of positrons is in the range of 100-250 ps, ​​and in the defect of materials, the annihilation lifetime of positrons is in the range of 200-500 ps, ​​which is called the capture annihilation of positrons, and the annihilation of positrons The lifetime becomes longer as the size of the defect increases. Different types of defects have different p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N33/00
Inventor 章志明王宝义马创新周春兰张天保魏龙任绍霞
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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