Repetitive event screening and processing method for multi-module radiation detectors

Abstract

The invention discloses a method for identifying and processing repeated events of a multi-module radiation detector. The method includes: sorting the nuclear particle events or radiation particle events detected by the radiation detector in chronological order; taking the time threshold t as the step size , each nuclear particle event or radiation particle event whose time difference does not exceed t is sequentially taken out, and each repeated nuclear particle event or repeated radiation particle event taken out in sequence is a cluster; for each cluster, the repeated nuclear particle event or Repeated radiation particle events, based on energy-weighted calculation of the original nuclear particle or original radiation particle's action position. The method realizes the discrimination of repeated events in the multi-module radiation detector, improves the detection accuracy of the position distribution information of nuclear particles or radiation particles such as gamma particles in the radiation detector, thereby improving the final source of nuclear particles or radiation particles The reconstruction accuracy of the spatial distribution of the source.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, in particular to a method for screening and processing repeated events of a multi-module radiation detector. Background technique [0002] The use of radiation detectors to detect the position, time and energy of nuclear particles is of great significance for understanding the type of the nuclear particles and obtaining the distribution image of the nuclear particles. An important application of the detection is the radiation imager, which uses the radiation detector to capture the position information of the incident nuclear particles, so as to reconstruct the large number of nuclear particles by obtaining the position distribution information of a large number of nuclear particles in the radiation detector spatial distribution information. [0003] In a radiation imager, in order to capture more nuclear particles and improve the detection efficiency and imaging sensitivity of the i...

AI Technical Summary

Problems solved by technology

There is a problem in this way of increasing the detection area. For example, in high-energy gamma-ray detection, since Compton scattering is the dominant factor when the gamma-ray interacts with the detector at this time, the gamma-ray What usually happens during detection is that the gamma rays undergo Compton scattering in a certain radiation detector, and the related scattered photons are detected by an adjacent radiation detector at the same time, and the detection process of the scattered photons can also occur as described above Compton scattering, such as figure 1 As shown, after the original gamma photon γ is incident on the radiation detector on the right, Compton scattering occurs in it, producing Compton scattered photon γ 1 , while γ 1 It is detected by the adjacent radiation detector on the left and Compton scattering can also occur

The above phenomenon is equivalent to the fact that a gamma photon may be detected at least twice, so that effective counts are formed in multiple radiation detectors, and the corresponding detection positions are also different, thus introducing repeated counting, resulting in radiation The count of gamma particle events at the detector junction increases abnormally, which affects the measurement accuracy of the nuclear particle position distribution information in the radiation detector, and finally affects the reconstruction accuracy of the nuclear particle spatial distribution information

Although the energy information of each scattered gamma photon is smaller than the energy of the original gamma photon, double-counting events can be eliminated through the energy information, but this elimination process will inevitably eliminate multiple gamma photon counts, resulting in The lack of detection counts is equivalent to the loss of a part of gamma photon counts, which affects the accuracy of the final reconstruction of the spatial distribution of gamma sources

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