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A fast neutron imaging system

An imaging system and neutron technology, applied in the measurement of neutron radiation, instrument, radiation measurement, etc., can solve the problems that it is difficult to meet the requirements of different field of view and resolution, the volume of the translation platform is large, the load is large, etc., to achieve Improve the efficiency of neutron detection and light collection, the effect of simple space setting

Active Publication Date: 2022-07-22
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing neutron photography devices mostly use a structure with a fixed distance between the conversion screen and the CCD camera, which is difficult to meet the requirements of different field of view and resolution
Before the present invention, China published a patent application "High-Speed ​​Neutron Camera Device" on November 16, 2011. The application number is ZL201110179473.9. It can respond to different field of view and resolution requirements, but in this design, the lens and CMOS camera are placed in a lead shielding box, and the lead shielding box is placed on the X translation stage, and the X translation stage drives the lens and CMOS camera While moving, it needs to drive the lead shielding box to move synchronously, the translation stage is bulky and has a heavy load

Method used

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  • A fast neutron imaging system
  • A fast neutron imaging system
  • A fast neutron imaging system

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Experimental program
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Embodiment 1

[0040] like Figure 1-5 As shown, a fast neutron imaging system in this embodiment includes a neutron conversion screen 1 , a reflector 2 , an image detector 3 , an optical adjustment frame 4 , a camera obscura 5 , a shielding module 6 and a computer control system 7 . Among them, the dark box 5 is specifically an "L"-shaped box body with a boss extending outward from one side, the extending direction of the boss is facing the neutron beam, and a shielding module 6 is provided on the side wall of the dark box 5 at the side end of the boss, and the dark box 5 A neutron conversion screen 1 , a reflector 2 , an image detector 3 and an optical adjustment frame 4 are accommodated therein.

[0041] The neutron conversion screen 1 is specifically arranged inside the obscure box 5 facing the incident direction of the neutron beam, and the other side of the neutron conversion screen 1 is provided with a reflector 2 which forms an angle of 45 degrees with the incident direction of the n...

Embodiment 2

[0051] The structure of a fast neutron imaging system of this embodiment is basically the same as that of Embodiment 1, and the main differences are: (1) the neutron conversion screen 1 is circular, with a diameter of 150 mm and a thickness of 32 mm; The thickness of 11 is 2mm, the thickness of electron multiplier layer 13 is 5mm, and the thickness of fluorescent layer 14 is 25mm; (2) The channel aperture of the microchannel plate is 20μm, the channel inclination angle is 8o, the channel spacing is 50μm, and a 2kV voltage is applied to both ends of the microchannel plate.

Embodiment 3

[0053] The structure of a fast neutron imaging system of this embodiment is basically the same as that of Embodiment 1, and the main differences are: (1) the neutron conversion screen 1 is circular, with a diameter of 150 mm and a thickness of 30 mm; The thickness of 11 is 2mm, the thickness of electron multiplying layer 13 is 4mm, and the thickness of fluorescent layer 14 is 15mm; (2) The channel aperture of the microchannel plate is 15μm, and the channel inclination angle is 8 o , the channel spacing is 50μm, and 1kV voltage is applied to both ends of the microchannel plate; (3) The image detector 3 adopts a silicon photomultiplier tube array; It is composed of avalanche photodiodes (APDs), which have the characteristics of high single-photon counting detection sensitivity, high gain, low bias voltage, insensitivity to magnetic fields, and compact structure. The transmitted neutrons of the sample interact with the neutron conversion screen 1 to generate photons, the silicon ...

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Abstract

The invention provides a fast neutron imaging system, comprising a neutron conversion screen, a reflector, an image detector, an optical adjustment frame, a camera obscura, a shielding module and a computer control system, wherein the neutron conversion screen, the reflector, the image detector The neutron conversion screen includes a neutron-proton conversion layer, a proton energy selection layer, an electron multiplication layer and a fluorescent layer; the image detector A silicon photomultiplier tube array or an image intensifier CCD camera is used; the optical adjustment frame includes a first translation stage and a second translation stage; one end of the first translation stage is provided with a reflector, and the other end is connected with a second translation stage. The stage is provided with an image detector opposite to the reflection mirror; the computer control system remotely controls the movement of the first translation stage and the second translation stage. The invention has a simple and compact structure, and can meet the imaging requirements of different fields of view and resolutions.

Description

technical field [0001] The invention relates to the technical field of neutron photography, in particular to a fast neutron imaging system. Background technique [0002] Neutron photography is a radiographic non-destructive testing method that uses the different neutron mass attenuation coefficients of different materials to obtain the internal structure of the sample. The high energy of fast neutrons makes it have higher penetrating ability than thermal neutrons and cold neutrons, which provides conditions for the detection of internal information of some thick objects. Fast neutron imaging technology makes up for the shortcomings of thermal neutron imaging technology and x-ray imaging technology in on-site detection of thick samples or large pieces, and is an important supplement to thermal neutron imaging technology and x-ray imaging technology. Fast neutron photography has broad application space and development prospects, especially in aerospace, nuclear materials, ant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T3/02G01T3/06G01T3/00
CPCG01T3/00G01T3/02G01T3/06
Inventor 吴宜灿李雅男张早娣章勇胡丽琴王芳
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI