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Method for Determining Incident Particle Type or Action Location Based on Pulse Waveform Discrimination

A pulse waveform and type technology, applied in the field of radiation detection, can solve the problems of poor discrimination effect, noise sensitivity, and failure to obtain discrimination effect, etc., and achieve the effect of improving pulse waveform discrimination ability, strong anti-noise ability, and strong waveform discrimination ability

Active Publication Date: 2021-08-24
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the shapes of different types of pulse waveforms are not significantly different, due to the influence of the statistical noise and electronic noise of the pulse waveform, the above methods often have poor screening effects, and it is difficult to distinguish the type of incident ray particles or obtain the action position of the incident ray
On the other hand, when the types of pulse waveforms increase, such as when more than three crystals are used in the design of the "Phoswich" detector, there are more than three waveform shapes that need to be screened, and the shapes of various types of pulse waveforms are relatively different. close, the above screening methods are often sensitive to noise and cannot obtain ideal screening results

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  • Method for Determining Incident Particle Type or Action Location Based on Pulse Waveform Discrimination
  • Method for Determining Incident Particle Type or Action Location Based on Pulse Waveform Discrimination
  • Method for Determining Incident Particle Type or Action Location Based on Pulse Waveform Discrimination

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specific Embodiment approach 1

[0046] Embodiment 1 (for particle type screening):

[0047] The neutron / gamma particle screening method based on full waveform statistical properties of the present invention has the following steps:

[0048] The detector used is a CLYC crystal detector, wherein the CLYC crystal size is 2.54 cm (φ)×2.54 cm (H), that is, the crystal size is a cylinder with a diameter and a height of 2.54 cm. One end of the CLYC crystal is coupled to a PMT for photoelectric signal conversion. Gamma or neutron incident CLYC crystal will interact with it to deposit energy to generate scintillation photons, which are transported to the PMT terminal, and photoelectrons are shot on the PMT photocathode to complete photoelectric conversion and output pulse waveform signals. Each neutron or gamma photon event can generate a pulse signal waveform. The PMT back-end electronics performs analog-to-digital conversion on the output pulse signal of the PMT and completes the signal waveform acquisition. Th...

specific Embodiment approach 2

[0066] Specific embodiment 2 (for ray action position extraction)

[0067] The ray action position extraction method based on full waveform statistical characteristics of the present invention has the following steps:

[0068] The detector used is "Phoswich" detector, the crystal types used are LYSO, YSO, GAGG and BGO respectively, and the luminescence decay time constants are 40ns, 60ns, 140ns and 300ns respectively. The size of the crystals is 1.5mm×1.5mm×10mm, and four kinds of crystals form a 2×2 array, in which an ESR reflective film with a thickness of about 0.1mm is pasted between the crystals, the outside and the top surface of the crystals to avoid optical crosstalk And light loss, the bottom surface of the crystal array is coupled to a silicon photomultiplier device SiPM unit, the SiPM product model used is SensL FC30035. The gamma photon incident crystal array reacts to deposit energy to generate scintillation photons, and the scintillation photons are transporte...

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Abstract

The invention discloses a method for identifying the type of incident ray particles or the position of incident action based on the pulse waveform screening of the full waveform statistical characteristics, which includes using a detector to collect a number of pulse waveforms of each type, recording the normalization of the collection The final pulse waveform; for each type of pulse waveform collected, the statistical characteristics of each sampling point are obtained; according to the statistical characteristics of each sampling point, the likelihood of characterizing the shape information of each type of pulse waveform is constructed The function model performs pulse waveform discrimination to determine the type of particle or the position of action. The present invention directly starts from the statistical characteristics of the full waveform, constructs a joint probability density distribution model representing the shape characteristics of the pulse waveform, and then uses the maximum likelihood estimation method to determine the pulse waveform type of the unknown type of waveform pulse to complete the pulse waveform screening. Compared with the existing technology, due to the use of the statistical characteristics of the full waveform, it has stronger anti-noise ability and stronger waveform discrimination ability, especially suitable for applications where there are many types of pulse waveforms and their respective shape characteristics are not significantly different Scenarios, the ability to discriminate pulse waveforms has been improved.

Description

technical field [0001] The present invention belongs to the technical field of radiation detection. Specifically, the present invention relates to a method for determining the type of incident ray particles or the position of incident action based on pulse waveform discrimination. The method identifies the type of pulse waveform based on the statistical characteristics of the full waveform. Background technique [0002] Pulse waveform discrimination technology has a wide range of applications in the field of radiation detection. On the one hand, the pulse waveform shape is an important carrier of particle type information. The pulse waveforms generated by different types of ray particles entering the detector have different shapes, and the type of ray particles can be identified by identifying the pulse waveform. For example, neutron and gamma incident plastic scintillator detectors usually exhibit different waveform decay time characteristics, which are reflected in differ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/06G01T3/02G01T1/00G01T1/29
CPCG01T1/003G01T1/2914G01T3/02G01T3/06
Inventor 范鹏夏彦丁义刚孙韶蕾朱成林杨晓宁张磊沈自才赵春晴李珺煜
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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