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Efficient neutron conversion screen

A neutron conversion screen, neutron technology, applied in the direction of conversion screen, photography technology, optics, etc., can solve the problems of long imaging time, weak light, unfavorable formation of clear images, etc., and achieve the effect of shortening the clear image

Inactive Publication Date: 2021-06-04
中科超睿(青岛)技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practical applications of this type of neutron conversion screen, if the intensity of neutrons reaching the conversion screen is low, the light emitted after passing through the neutron conversion screen is weak, which is not conducive to forming a clear image and the imaging time is longer, so it is important for The neutron source strength requirement of the camera device is high or it is not suitable for thicker samples to be tested

Method used

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  • Efficient neutron conversion screen

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Effect test

Embodiment 1

[0016] This case is an efficient neutron conversion screen suitable for heat neutron imaging. The design principle is to increase the number of neutron reached by the fluorescent layer by multiplying the neutron reacted by the neutron reaching the conversion screen. The neutron conversion screen is composed of neutron multiplier layer 1, the fluorescent layer 2, and the high purity hard aluminum plate 3, and the fluorescent layer 2 is coated with a uniformly applied manner on high purity hard aluminum plate 3, neutral multiplier 1 to uniformly apply. Compared with the fluorescent layer 2, such as figure 1 Indicated.

[0017] The neutronic multiplication layer 1 is placed in the neutron multiplication material, and the multiplication material selects a fission material such as U235, PU239 or TH233, such as for U235, using U235, with a neutron, and ambigulent reaction reaction releases 2.45 neutrons, achieving effective neutrons. Multiplication;

[0018] The fluorescent layer 2 cons...

Embodiment 2

[0021] This case is an efficient neutron conversion screen suitable for fast neutron imaging. The design principle is to multiply by reacting the neutron reaching the conversion screen by (N, 2N) or (N, 3N). The number of neutron reached the fluorescent layer. The neutron conversion screen is composed of neutron multiplier layer 1, the fluorescent layer 2, and the high purity hard aluminum plate 3, and the fluorescent layer 2 is coated with a uniformly applied manner on high purity hard aluminum plate 3, neutral multiplier 1 to uniformly apply. Compared with the fluorescent layer 2, such as figure 1 Indicated.

[0022] The neutron multiplier layer 1 is placed in the neutron multiplication material, and the multiplication material is selected from the compound or alloy containing elements such as BE or PB or BI or Zr, such as for BE, when the neutron energy is higher than 1.9 MeV, BE and neutron occur ( N, 2N) Neutron reactions, i.e., absorb a neutron, release 2 neulin, and achieve...

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Abstract

The invention provides an efficient neutron conversion screen, and relates to the technical field of neutron photography; an efficient neutron conversion screen is composed of a neutron multiplication layer, a fluorescent layer and a high-purity duralumin plate; wherein the high-purity duralumin plate is coated with the fluorescent layer in a uniform smearing mode, and the fluorescent layer is coated with the neutron multiplication layer in a uniform smearing mode; a neutron multiplication material is placed in the neutron multiplication layer, wherein neutron multiplication is carried out through fission or (n, 2n) or (n, 3n) and other reactions, the number of neutrons reaching the fluorescent layer is increased, and then light emitted after passing through the neutron conversion screen is enhanced. The neutron signal reaching the conversion screen can be amplified, and formation of a clear image and shortening of imaging time are facilitated even under the condition of a weak source or a thick sample to be detected.

Description

Technical field [0001] The present invention relates to the field of neutron photographing, and more particularly to a highly efficient neutron conversion screen. Background technique [0002] The neutron photograph is to obtain internal information of the detection object through the attenuation change in the intensity of the neutron passing through the detection object. Compared to other non-destructive testing technology, neutrons have unique advantages: neutron penetration capacity, can be imaged on large parts, density (or thickness), sensitive to light elements, widely used in nuclear medicine, Anti-terrorism security and weapon testing areas; neutrons are sensitive to certain isotope, can be applied to archaeological, customs and nuclear energy, and the neutrons can imaging radioactive substances, which can be used for radioactive sources, nuclear fuels, radiosensitive materials. [0003] The neutron conversion screen is a key component of the neutron photographic device, ...

Claims

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Application Information

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IPC IPC(8): G21K4/00
CPCG21K4/00G21K2004/04
Inventor 不公告发明人
Owner 中科超睿(青岛)技术有限公司
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