Positron annihilation angle correlation measurement device and method based on positioning algorithm

Abstract

The invention, which belongs to the technical field of nuclear detection, relates to a positron annihilation angle correlation measurement device and method based on a positioning algorithm, thereby solving a problem that the measurement precision in the prior art is limited by the equipment precision. The device comprises a first fixed detector and a second fixed detector, a coincidence module, apositioning system, and a coincidence system. The first fixed detector and the second fixed detector are respectively used for detecting fluorescence signals generated by first gamma photons and second gamma photons which are generated by annihilation of electrons and positron in a sample and are propagated along a reverse direction; the coincidence module is used for processing the fluorescencesignals to obtain a first two-dimensional array and a second two-dimensional array which correspond to each other; the positioning system is used for obtaining incident position information of the first gamma photons and the second gamma photons according to the two-dimensional array; and the coincidence system is used for collecting incident position information of the first gamma photons and thesecond gamma photons within coincidence time, obtaining a corresponding three-dimensional annihilation angle in combination with the position information of the sample, and further obtaining a two-dimensional positron annihilation angle correlation spectrum. The defect that the measurement precision is limited by the precision of measurement equipment is overcome, and the measurement precision isimproved.

Description

technical field [0001] The invention relates to the technical field of nuclear detection, in particular to a positioning algorithm-based positron annihilation angle correlation measurement device and method. Background technique [0002] Positron annihilation spectrometer is widely used in the study of the microstructure of metals, semiconductors, superconducting materials, polymers and other materials, especially in the field of research related to electronic density of states and electronic momentum. The annihilation characteristic gamma photon momentum distribution due to electron momentum is an important characterization parameter in positron annihilation spectroscopy, which is also the target parameter of positron annihilation angle correlation spectrometer. After the positron is thermalized in the material, it annihilates with the electron. According to the conservation of momentum, the two characteristic gamma rays in opposite directions generated by the annihilation ...

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Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a positron annihilation angle correlation measurement device and method based on a positioning algorithm to solve the problem that the measurement accuracy of existing measurement devices is limited by the accuracy of measurement equipment

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