Neutron detector

A neutron detector and detector technology, applied in the field of safety detection, can solve problems such as excessive X-rays, inability to obtain neutron transmission information, and insensitivity of X-rays

Active Publication Date: 2012-07-25
NUCTECH CO LTD +1
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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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Embodiment Construction

[0014] Such as figure 1 As shown, one of the known fast neutron generation methods is first to bombard the electron target 11 with the electron beam provided by the electron accelerator to generate X-rays, and then use the X-rays to bombard the photoneutron conversion target 12 to generate photoneutrons. Generally used optical neutron targets are nuclides with low optical neutron threshold, such as 9 Be and 2 H, therefore, the beryllium target and the heavy water target usually act as neutron converters, and the reaction type of the beryllium target can be expressed by the following formula:

[0015] (1)

[0016] Among them, γ represents photons, n represents neutrons, and the energy of neutrons is determined by the difference between the energy of photons and the reaction threshold. The reaction type of the heavy water target can be expressed by the following formula:

[0017] (2)

[0018] It can be seen from the above reaction formulas (1) an...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/04
Inventor 李元景杨祎罡李铁柱张勤俭吴彬
Owner NUCTECH CO LTD
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