Fast neutron detection method, substance identification methods and neutron detector

Abstract

The invention discloses a fast neutron detection method, which is used for detecting fast neutrons with X-rays, and comprises the following steps: passing the fast neutrons through a neutron slowing body to absorb the X-rays and slow the fast neutrons into thermal neutrons; and detecting the thermal neutrons by using a thermal neutron detector to obtain the information on the fast neutrons. The invention also discloses a method for identifying substances by using photoneutrons, a method for identifying substances by using X-rays and the photoneutrons, and a neutron detector. The neutron detector comprises the neutron slowing body which is suitable for absorbing the X-rays therein and slowing the fast neutrons into the thermal neutrons; and the thermal neutron detector which is suitable for detecting the thermal neutrons to obtain the information on the fast neutrons. In the invention, the interference of the X-rays with the fast neutron measurement can be eliminated by arranging the neutron slowing body, so the accuracy of the neutron measurement is improved. And as the attenuation information of the X-rays and the attenuation information of the neutrons, which are different, are obtained at the same time, the capability of identifying detected objects is improved.

Description

technical field [0001] The present invention generally relates to the field of safe detection by using X-rays and neutrons, and more specifically relates to a fast neutron detection method accompanied by X-rays, a method for identifying substances by using photoneutrons, and simultaneously using X-rays and photoneutrons to identify substances methods, and neutron detectors. Background technique [0002] With the development of economy and society, the application range of security detection technology is getting wider and wider, such as subway stations, airports, banks, shopping malls, etc., can be seen almost everywhere. There are many kinds of safety detection technologies, among which the use of photoneutrons produced by accelerators for safety detection technology is a technology that has been partially studied, and some people have done in-depth work on the use of photoneutrons for elemental analysis-this kind The method uses X-rays produced by high-energy electron acc...

AI Technical Summary

Problems solved by technology

But this scheme is still at the stage of principle. To make it possible, a problem must be solved: how to realize the measurement of optical neutrons under the strong pulse of X-rays? Because photoneutrons are produced with X-rays, although the photoneutron conversion target plays a certain role in X-ray shielding, there are still a lot of X-rays entering the neutron detector, which can generally be considered to be more than 4 orders of magnitude

Although neutron detectors can choose neutron-sensitive detectors, due to the excessive amount of X-rays, no matter how insensitive the detector is to X-rays, the general situation is that X-rays are still formed in neutron detectors. a huge signal, significantly exceeding the signal formed by neutron detectors in it, which practically makes the acquisition of neutron transmission information impossible

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