Automatic time calibration method along with particle neutron detection

Abstract

The invention provides an automatic time calibration method along with particle neutron detection. The time calibration method comprises the following steps: placing a graphite block at a certain distance in front of a neutron generator; controlling the neutron generator to emit neutron beams to the graphite block; measuring an alpha-gamma conformance flight time spectrum based on an associated particle detection technology; determining a spectrum peak formed by directly acting neutrons on the graphite block according to the measured alpha-gamma conformance flight time spectrum, and taking theconformance time corresponding to the spectrum peak as measurement reference time; and carrying out neutron detection on a detection object to determine content characteristics of related elements inthe detection object. According to the method, the problem that the calibration time of a Si semiconductor detector used for measuring the accompanying particles along with temperature and time changes is unstable is solved, the detection positioning precision of the to-be-detected object is ensured, and accurate analysis of element characteristics in a detection area is realized.

Description

technical field [0001] The invention relates to the technical field of neutron detection, in particular to an automatic time calibration method in the neutron detection process. Background technique [0002] At present, terrorist incidents occur frequently in the world. It is one of the common ways for terrorists to hide explosives in packages and then wait for an opportunity to detonate them. In order to effectively detect hidden explosives, it is necessary to provide a detection method and related equipment that can quickly and accurately identify explosives. Nuclear detection technologies for explosives mainly include X-ray detection method, neutron detection method, electromagnetic measurement method, and electrochemical detection method. [0003] At present, X-ray fluoroscopy, X-ray-CT density detection method, and electric quadrupole moment detection method are the most widely used in the world. X-ray imaging technology can distinguish the density of the item, but ca...

AI Technical Summary

Problems solved by technology

[0004] When using neutron-accompanied α-particle imaging technology to detect packages, with the passage of time and the increase in the use of equipment, the phenomenon of measurement drift will occur, that is, it is originally a measurement of a certain position of the detection object, but the use of When the detection results of the neutron detection equipment are calculated, the measurement results of the position are not obtained, which will lead to measurement deviations

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