Neutron detector

Abstract

The invention discloses a neutron detector. The neutron detector comprises a neutron moderating body and a thermal neutron detector, wherein the neutron moderating body is suitable for absorbing X rays passing through the neutron moderating body and moderating fast neutrons into thermal neutrons; and the thermal neutron detector is suitable for detecting the thermal neutrons to acquire information about the fast neutrons. Through the neutron moderating body, interference of the X rays to fast neutron measurement can be eliminated, so that the neutron measurement accuracy is improved. The identification capacity of a detected object is improved by simultaneously acquiring two types of different attenuation information of the X rays and the neutrons.

Description

technical field [0001] The present invention relates generally to the field of safety detection using X-rays and neutrons, and more particularly to 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 accelerators to bombard targets with low photoneutron reaction thresholds, including heavy water and beryllium, to generate photoneutrons, and the generated photoneutrons react with certain nuclides in the detected...

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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