Fast neutron imaging method and system based on time-of-flight method

Abstract

The invention relates to a fast neutron imaging technology, and in particular relates to a fast neutron imaging method and system based on a time-of-flight method. The method comprises the steps that: a plurality of scintillant units form a scintillant array to enable the scintillant array to be coupled with a position sensitive detector; the whole coupled detector array is arranged away from a neutron source; a sample is arranged close to the neutron source; the measurement is performed by using the neutron time-of-flight method; interference factors are eliminated by using a conforming method to obtain effective counting on each scintillant unit detector; and the effective counting on each scintillant unit detector is arrayed to obtain a two-dimensional image in which only acting source neutrons acts. The method and the system adopt a detector array design mode, so that the detection efficiency is improved; and the time-of-flight method measurement mode can effectively remove scattered sample neutrons, an environment diffuse scattering background and a gamma background, and a signal-to-noise ratio is increased.

Description

technical field [0001] The invention relates to fast neutron imaging technology, in particular to a fast neutron imaging method and system device based on the time-of-flight method. Background technique [0002] Fast neutron imaging technology, as an important non-destructive testing technology, is an important supplementary means of x-ray imaging and thermal neutron imaging, and is currently a hot research topic in ray imaging technology. Foreign research focuses on improving the neutron source intensity and developing new imaging techniques. US Lawrence Livermore Laboratory adopts RFQ accelerator, windowless gas target, DD neutron output reaches 10 12 n / s, the opposite density exceeds 100g / cm 2 The position resolution of large objects reaches the order of millimeters. The fast neutron imaging system at Argonne can resolve water-containing defects about 0.8 mm in diameter inside a 1.25 cm thick alloy body. Fast neutron imaging methods are diversified, not only the trans...

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Problems solved by technology

[0004] The purpose of the present invention is to address the defects of the prior art, to propose a fast neutron imaging method and system based on the time-of-flight method, and to solve the problems of low spatial resolution, Imaging issues with low detection efficiency and low signal-to-noise ratio

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