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A two-dimensional positron annihilation angle correlation measurement device and method

A technology of positron annihilation and measuring device, applied in the field of nuclear detection, can solve the problems of low counting efficiency of measuring device, high requirement of instrument precision, difficult to popularize application, etc. Effect

Active Publication Date: 2022-04-26
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a two-dimensional positron annihilation angle correlative measurement device and method to solve the problems of low counting efficiency, high instrument precision requirements, complicated operation and difficulty in popularization and application of existing measurement devices

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  • A two-dimensional positron annihilation angle correlation measurement device and method
  • A two-dimensional positron annihilation angle correlation measurement device and method
  • A two-dimensional positron annihilation angle correlation measurement device and method

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Embodiment Construction

[0058] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

[0059] Device embodiment

[0060] A specific embodiment of the present invention discloses a two-dimensional positron annihilation angle correlation measurement device. Such as figure 1 As shown, it includes a first fixed detector, a second fixed detector and a coincidence system.

[0061] Wherein, the first fixed detector includes a plurality of first square detection units arranged in a two-dimensional array, and the second fixed detector includes a plurality of second square detection units arranged in a two-dimensional array. Preferably, the number and size of the first square detection...

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Abstract

The invention relates to a two-dimensional positron annihilation angle correlation measurement device and method, which belongs to the technical field of nuclear detection and solves the problems of large counting loss, complicated operation and difficulty in popularization and application of the existing measurement device. The device includes: a first fixed detector and a second fixed detector are respectively arranged on both sides of the sample in parallel and symmetrically; a plurality of first square detection units of the first fixed detector and a plurality of second detectors of the second fixed detector The square detection unit is used to detect the incident position information of the first gamma photon and the second gamma photon propagating in the opposite direction produced by the annihilation of electrons and positrons in the sample; the coincidence system is used to collect the first gamma photon within the coincidence time The incident position information of the gamma photon and the second gamma photon is combined with the position information of the sample to obtain the corresponding three-dimensional annihilation angle, and then the two-dimensional positron annihilation angle correlation spectrum is obtained. While improving the count rate and measurement accuracy, the operation is simplified and the applicability is strong.

Description

technical field [0001] The invention relates to the technical field of nuclear detection, in particular to a two-dimensional positron annihilation angle correlation measurement device and method. Background technique [0002] At first, the Positron Annihilation Angle Correlation (ACAR) was mainly used to study the physical process of positron and electron annihilation. In the 1930s, O. Klemperer, through his angle correlation experiments, revealed that positron annihilation mainly emits two gamma photons in opposite directions. Twenty years later, it was realized that information about the electronic structure of solids could be obtained by measuring deviations from the collinearity of annihilation radiation. During this period, one-dimensional angular correlating devices with long slit structures were mainly used. Another 20 years later, due to the development and use of two-dimensional gamma cameras and multi-wire proportional chambers, the first two-dimensional angle co...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/36
CPCG01T1/362G01T1/366G01T1/361
Inventor 况鹏刘福雁张鹏于润升王宝义曹兴忠吴亚茹魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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