Anticoincidence-based positron annihilation doppler broadening spectra method and system

A technology of Doppler broadening spectrum and positron annihilation, applied in the field of nuclear spectroscopy and nuclear detection, can solve the problems of high vacuum, difficult to meet the needs of real-time measurement on site and liquid sample measurement, difficult to change the atmosphere environment, etc. The effect of shortening the spacing

Inactive Publication Date: 2017-06-13
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

Although this method can measure the Doppler broadening spectrum of some special samples that are not easy to prepare, its measurement device requires a large sample measurement chamber and a high vacuum degree; at the same time, this measurement structure is not easy to change the location of the sample Atmosphere environment (magnetic field, high temperature, high pressure, etc.)
Therefore, this measurement method is also difficult to meet the needs of on-site real-time measurement and liquid sample measurement.

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  • Anticoincidence-based positron annihilation doppler broadening spectra method and system

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[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0034] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the ...

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Abstract

The invention discloses an anticoincidence-based positron annihilation doppler broadening spectra method and system. The method comprises the following steps: generating positron through a radioactive source, wherein the positron comprises a first positron which enters a sample, and a second positron which enters a flicker flake; acquiring gamma photon energy information generated by positron annihilation, wherein the gamma photon energy information comprises first gamma photon energy information generated by first positron annihilation, and second gamma photon energy information generated by second positron annihilation; acquiring a fluorescence signal generated by the second positron through the flicker flake; removing the second gamma photon energy information from the gamma photon energy information according to the fluorescence signal. With the adoption of the method and the system, invalid gamma photon energy information can be removed.

Description

technical field [0001] The invention relates to the technical field of nuclear spectroscopy and nuclear detection, in particular to a method and system for positron annihilation Doppler broadening spectrum based on anticoincidence. Background technique [0002] After the positrons generated by the positron source are injected into the material, they annihilate with the electrons in the material after thermalization and random diffusion, and emit characteristic gamma photons. The time and energy information carried by the gamma photons reflect the The lifetime in the material and the momentum and energy information of the annihilation electron with the positron reflect the microstructure of the material. [0003] In conventional measurement methods, such as figure 1 As shown, the "sandwich" structure of sample-radiation source-sample is used for measurement. This structure requires two pieces of the same sample to tightly clamp the radioactive source, so as to ensure that a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00
CPCG01N23/00
Inventor 刘福雁王宝义李崇况鹏曹兴忠张鹏章志明魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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