Nondestructive container detection method based on Compton gamma light-nuclear resonance fluorescence

Abstract

The invention discloses a nondestructive container detection method based on the Compton gamma light-nuclear resonance fluorescence. The method comprises the following steps: (1) putting a Compton gamma light source on one side of a container to supply gamma light beams, and putting energy spectrometers on the two sides of the container, wherein included angles of 90 degrees and -90 degrees are formed between the energy spectrometers in the horizontal plane and the direction of an incident gamma beam respectively for performing energy spectrum measurement; (2) identifying nuclear resonance fluorescence characteristic peaks of various nuclides according to the distribution of measured energy spectra so as to further obtain possible nuclide type information in the container; (3) putting a flow intensity detector on the other side, opposite to the side in which the light source is arranged, of the container, and measuring the number of rays passing through different container positions by horizontally and vertically scanning the container to obtain position information and ray intensity information; and (4) putting nuclide evidential foils with different thicknesses between the container and the flow intensity detector, repeatedly executing the step (3), and comparing the ray intensity value with the ray intensity value measured in the step (3). According to the method, the various nuclides can be identified quickly and accurately, the signal to noise ratio is improved, the photographic reproduction dosage is reduced, and the scanning time is shortened.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and in particular relates to a container non-destructive testing method based on Compton gamma light-nuclear resonance fluorescence. Background technique [0002] Compton light source refers to an X / γ-ray source produced by inverse Compton scattering of high-power laser and relativistic electron beam. It has the characteristics of (relatively) high flux, short pulse, (quasi) single energy, good directionality, high polarization, and adjustable energy. It is a powerful probe for revealing the structure of matter and life phenomena at the atomic / molecular scale. As one of the needles, it also has extremely high application value in many frontier fields such as physics, chemistry, biology, medicine, isotope imaging, and energy demand. [0003] The existing non-destructive testing system cannot analyze various nuclides quickly and accurately, the signal-to-noise ratio needs to be improved, the...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a container non-destructive testing method based on Compton gamma light-Nuclear Resonance Fluorescence (NRF), aiming at solving the problem that the existing non-destructive testing system cannot quickly and accurately analyze various nuclides, The signal-to-noise ratio needs to be improved, the re-irradiation dose is large, and the scanning time is long

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