CN111982940A - Thermal neutron transmission imaging method and imaging device based on compact D-D neutron source - Google Patents
Thermal neutron transmission imaging method and imaging device based on compact D-D neutron source Download PDFInfo
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- CN111982940A CN111982940A CN202010815745.9A CN202010815745A CN111982940A CN 111982940 A CN111982940 A CN 111982940A CN 202010815745 A CN202010815745 A CN 202010815745A CN 111982940 A CN111982940 A CN 111982940A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/05—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using neutrons
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/09—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being neutrons
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Abstract
The invention discloses a thermal neutron transmission imaging method and an imaging device based on a compact D-D neutron source, wherein a compact D-D neutron source is adopted to provide exogenous neutrons, 2.45MeV D-D fast neutrons output by the compact D-D neutron source are slowed into thermal neutrons or epithermal neutrons through a neutron moderating body, the moderated thermal neutrons enter a conical neutron collimation pore passage which is vertically arranged in the neutron moderating body above the D-D neutron source and is large in the upper part and small in the lower part, the collimated thermal neutron beams transmit an object to be detected, the thermal neutrons transmitted through the object are detected through a thermal neutron image detector system arranged at the upper end of the conical neutron collimation pore passage, the thermal neutron image detector system is converted into a digital transmission image, the two-dimensional spatial distribution of the transmission intensity of the thermal neutrons is obtained, and further the internal structure of the object to be detected and the spatial distribution condition of different materials are obtained. The invention has the characteristics of movable, rapidness, accuracy, no damage and good spatial resolution, and can be used for the nondestructive detection of objects.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing of objects, and particularly relates to a thermal neutron transmission imaging method and device based on a compact D-D neutron source.
Background
Neutron radiography in its broadest sense includes neutron transmission imaging, neutron tomography imaging, neutron resonance imaging, neutron polarization imaging, neutron phase imaging, neutron holographic imaging, neutron small angle scattering imaging, neutron coded imaging, neutron phase imaging, and the like. Similar to common X-ray imaging, neutron radiography is an imaging method that utilizes intensity change caused by scattering or absorption when a neutron beam penetrates an object to obtain information such as the structure and internal defects of the object to be irradiated, and is a nondestructive testing technology with potential application value. Compared with X-rays, the sensitivity of neutrons to various element substances is obviously different, the absorption coefficients of neutrons with different energies to various substances are also different, and the element sensitivity of thermal neutrons is better than that of fast neutrons. Thus, X-ray imaging is generally used to detect heavy elemental species and their defects, while neutrophography is an important addition to X-ray imaging techniques, particularly low energy neutron imaging, which can be used to detect light elemental species and their defects surrounded by heavy elemental species, and can also be used to distinguish isotopes from neighboring elements.
Thermal neutron imaging is a nondestructive testing technique for imaging by irradiating a test object with thermal neutrons having an energy of about 0.025eV, and thermal neutron radiography has been widely paid attention to because it has advantages of high imaging spatial resolution, high detection efficiency, and the like. The thermal neutron imaging is suitable for the nondestructive detection requirement of small-volume and thin objects, is applied to the fields of aerospace, industrial production, biochemistry and the like, for example, the nondestructive detection of aircraft engines, wings, initiating explosive devices, nuclear fuel assemblies and the like, the detection of hydrides and the like, and the application of the neutron photography technology greatly promotes the development of new energy and advanced manufacturing industry. Internationally, Lehman et al, paul sierle, switzerland, have implemented thermal neutron photography using boron and gadolinium doped thermal neutron fluorescence conversion screens; tremsin et al, berkeley university, california, developed thermal neutron photographic equipment based on thermal neutron sensitive microchannel plates (MCPs) and successfully applied to practical nondestructive testing experiments; NRAY corporation of canada has implemented thermal neutron photography on a reactor neutron source and has provided technical support for imaging of engines such as rossley, general and toyota; the us phoenix nuclear physics laboratory company has now successfully developed a mobile thermal neutron photography system and provided the us military with technical support for non-destructive testing of initiating explosive devices such as projectiles and the like.
The problems existing in the prior art are as follows: the existing thermal neutron transmission imaging system provides a thermal neutron field based on a reactor neutron source, and the reactor neutron source has the defects of complex structure, high gamma background, huge operation system, high manufacturing cost, high operation and maintenance cost, immobility and the like. Therefore, the thermal neutron transmission imaging system based on the reactor is difficult to be suitable for the transmission detection requirements of materials in the fields of industrial manufacturing industry, aerospace, ships and the like. Secondly, the existing thermal neutron transmission imaging detector adopts a thermal neutron fluorescence conversion screen or a thermal neutron sensitive microchannel plate (MCP) device, the working principle is that thermal neutrons are converted into charged particles, electrons are multiplied in the MCP, the charged particles are converted into optical signals through the fluorescence conversion screen, the optical signals are collected to obtain information of the transmission neutrons, the position resolution of the neutrons is seriously damaged by the three-time conversion of the transmission neutrons, and the position resolution of the whole system is low.
Disclosure of Invention
In view of the above-mentioned shortcomings in the background art, the present invention provides a thermal neutron transmission imaging method and an imaging device based on a compact D-D neutron source, which aims to solve the problems existing in the prior art in the above-mentioned background art.
In order to achieve the purpose, the invention adopts the technical scheme that:
a thermal neutron transmission imaging method based on a compact D-D neutron source is characterized in that a compact D-D neutron source is adopted to provide exogenous neutrons, the compact D-D neutron source outputs 2.45MeV D-D fast neutrons, the D-D fast neutrons enter a hydrogen-containing neutron moderating body to be moderated into thermal neutrons or epithermal neutrons, the moderated thermal neutrons or epithermal neutrons enter a conical neutron collimation pore passage in the neutron moderating body, collimated thermal neutron beams transmit a detected object, thermal neutrons transmitting through the object are detected through a thermal neutron image detector system, detected thermal neutrons are converted into digital transmission images through the thermal neutron image detector system, two-dimensional space distribution of thermal neutron transmission intensity is obtained, and structural images inside the detected object are obtained through the two-dimensional space distribution of the thermal neutron transmission intensity.
The invention further provides a thermal neutron transmission imaging device based on a compact D-D neutron source, which comprises a compact D-D neutron source, a neutron moderating body, a gamma shield, a conical neutron collimation pore channel and a thermal neutron image detector system, wherein the compact D-D neutron source is wrapped with the hydrogen-containing neutron moderating body with a certain thickness, the gamma shield is wrapped at the periphery of the neutron moderating body, the radiation safety performance of the periphery of the device is ensured, and the environmental radiation dose equivalent rate at the position of 30cm on the outer surface of the shield body is less than the national safety standard of 2.5 mu Sv/h. A conical neutron collimation pore channel with a large top and a small bottom is vertically arranged in the neutron moderating body above the compact D-D neutron source and used for obtaining a quasi-parallel neutron beam, and a thermal neutron image detector system is mounted at the upper end of the conical neutron collimation pore channel.
Preferably, the lower end of the conical neutron collimation pore channel is located 15cm above a neutron output port of the compact D-D neutron source.
Preferably, the upper end of the conical neutron collimation pore canal is positioned at the boundary of a gamma shield, and the thermal neutron image detector system is positioned outside the gamma shield.
Preferably, the thickness of the neutron moderator is 15 cm.
Preferably, the thermal neutron image detector system comprises6LiF fluorescence conversion screen, reflector and CCD camera, the6The LiF fluorescent conversion screen is aligned to the upper end of the conical neutron collimation pore passage and is used for detecting neutron beams, and the CCD cameraAn optical lens is arranged on the upper part.
The invention further provides an application of the thermal neutron transmission imaging device based on the compact D-D neutron source in nondestructive detection by utilizing the spatial intensity distribution condition of the transmitted thermal neutrons.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
the thermal neutron transmission imaging method based on the compact D-D neutron source provided by the invention utilizes the compact D-D accelerator neutron source to emit neutrons, then utilizes the neutron moderating body to moderate the neutrons into thermal neutrons or epithermal neutron transmission samples, and the thermal neutron fluence in the imaging field after the moderating collimation is more than 104n/(cm2s), the space uniformity of neutron fluence is more than 95%, and the parallelism of thermal neutrons is better than 93%. The thermal neutrons after transmitting the sample are detected and converted into a digital transmission image, and the neutron fluxes transmitted by the conical neutron collimation pore passage through the detected sample have difference in space due to different absorption reaction cross sections of the thermal neutrons and different elements in the detected object, so that the two-dimensional spatial distribution of the transmission intensity of the thermal neutrons can be obtained through the transmission image, and the internal structure of the detected object and the spatial distribution conditions of different materials are further obtained. The invention has the characteristics of mobility, rapidness, accuracy, no damage and good spatial resolution, and provides an equipment foundation for the transmission detection of materials in the fields of industrial manufacturing industry, aerospace, ships and the like in China.
Drawings
FIG. 1 is a flow chart of a thermal neutron transmission imaging method based on a compact D-D neutron source according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a thermal neutron transmission imaging device based on a compact D-D neutron source provided by an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a thermal neutron image detector system according to an embodiment of the present invention.
In the figure: 1-compact D-D neutron source; 2-neutron moderators; a 3-gamma shield; 4-a conical neutron collimation channel; 5-thermal neutron image detector system; 501-neutron beam; 502-6LiF fluorescent conversion screen; 503-mirror; 504-optical mirrorA head; 505-CCD camera.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a thermal neutron transmission imaging method based on a compact D-D neutron source, a flow chart refers to FIG. 1, the compact D-D neutron source is adopted to provide exogenous neutrons, the D-D neutron yield is more than 109n/s and the neutron output stability is better than 99 percent, the D-D fast neutrons of 2.45MeV output by the compact D-D neutron source are moderated into thermal neutrons or epithermal neutrons by a neutron moderating body, the moderated thermal neutrons or epithermal neutrons enter a conical neutron collimation pore channel, the collimated thermal neutron beams transmit a detected object, the thermal neutrons transmitted through the object are detected by a thermal neutron image detector system, the detected thermal neutrons are converted into a digital transmission image by the thermal neutron image detector system to obtain the two-dimensional spatial distribution of the thermal neutron transmission intensity, and the structural image of the inside of the detected object is obtained through the two-dimensional spatial distribution of the thermal neutron transmission intensity, so that the internal structure of the detected object and the spatial distribution conditions of different materials are obtained.
The imaging device for realizing the imaging method comprises a compact D-D neutron source 1, a neutron moderating body 2, a gamma shield 3, a conical neutron collimation pore passage 4 and a thermal neutron image detector system 5, wherein the thickness of the hydrogen-containing neutron moderating body 2 wrapped outside the compact D-D neutron source 1 is 15cm, the D-D fast neutrons of 2.45MeV can be effectively moderated into thermal neutrons, and the thermal neutron ratio is more than 85%. The gamma shield 3 is wrapped on the periphery of the neutron moderating body 2, the radiation safety performance of the periphery of the device is guaranteed, and the environmental radiation dose equivalent rate at the position of 30cm of the outer surface of the shield 3 is smaller than the national safety standard of 2.5 mu Sv/h. A conical neutron collimation pore channel 4 with a large upper part and a small lower part is vertically arranged in a neutron moderating body 3 above the compact D-D neutron source 1 and used for obtaining a quasi-parallel neutron beam, and the lower end of the conical neutron collimation pore channel 4 is located 15cm above a neutron output port of the compact D-D neutron source 1. Conical neutron quasiThe upper end of the straight pore canal 4 is provided with a thermal neutron image detector system 5. A thermal neutron image detector system 5 is located outside the gamma shield 3. The length of the whole device is 1.8m, the width is 1.0m, and the height is 1.0 m. The thermal neutron image detector system 5 has good spatial position resolution up to 100 μm, and has a structure shown in FIG. 3 including6A LiF fluorescent conversion screen 502, a reflecting mirror 503 and a CCD camera 505,6the LiF fluorescence conversion screen 502 is aligned with the upper end of the conical neutron collimation channel 4 and is used for detecting the neutron beam 501 of the conical neutron collimation channel 4, and the CCD camera 505 is provided with an optical lens 504. Transmitting thermal neutrons of nuclear fuel6LiF interaction, nuclear reaction occurs6Li+n→3H+4He +4.78MeV to generate charged particles t and alpha, wherein the charged particles deposit energy on the crystal ZnS to excite atoms to emit fluorescence, the optical signal is reflected by the reflector 503 and enters the CCD camera 505, and the CCD camera obtains the transmission image information of the sample to be detected.
The thermal neutron transmission imaging device based on the compact D-D neutron source can perform nondestructive detection on an object by utilizing the spatial intensity distribution condition of the transmitted thermal neutrons.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A thermal neutron transmission imaging method based on a compact D-D neutron source is characterized in that the compact D-D neutron source is adopted to provide exogenous neutrons, the compact D-D neutron source outputs 2.45MeV D-D fast neutrons, the D-D fast neutrons enter a hydrogen-containing neutron moderating body to be moderated into thermal neutrons or epithermal neutrons, the moderated thermal neutrons or epithermal neutrons enter a conical neutron collimation pore passage in the neutron moderating body, the collimated thermal neutron beams transmit an object to be detected, the thermal neutrons transmitting through the object are detected by a thermal neutron image detector system, the detected thermal neutrons are converted into digital transmission images by the thermal neutron image detector system, and two-dimensional spatial distribution of thermal neutron transmission intensity is obtained, and obtaining a structural image of the interior of the detected object through the two-dimensional spatial distribution of the thermal neutron transmission intensity.
2. An imaging device used in the thermal neutron transmission imaging method based on the compact D-D neutron source according to claim 1, comprising a compact D-D neutron source, a neutron moderating body, a gamma shield, a conical neutron collimation pore channel and a thermal neutron image detector system, wherein the compact D-D neutron source is wrapped with the hydrogen-containing neutron moderating body with a certain thickness, the gamma shield is wrapped around the neutron moderating body, the conical neutron collimation pore channel with a large top and a small bottom is vertically arranged in the neutron moderating body above the compact D-D neutron source, and the thermal neutron image detector system is installed at the upper end of the conical neutron collimation pore channel.
3. The imaging apparatus of claim 2, wherein a lower end of the tapered neutron collimating tunnel is located 15cm above a neutron output port of the compact D-D neutron source.
4. The imaging apparatus of claim 2, wherein an upper end of the conical neutron collimating tunnel is located at a boundary of a gamma shield, and the thermal neutron image detector system is located outside the gamma shield.
5. The imaging apparatus of claim 2, wherein the neutron moderator is 15cm thick.
6. The imaging apparatus of claim 2, wherein the thermal neutron image detector system comprises6LiF fluorescence conversion screen, reflector and CCD camera, the6The LiF fluorescence conversion screen is aligned to the upper end of the conical neutron collimation pore channel and used for detecting neutron beams, and an optical lens is arranged on the CCD camera.
7. Use of the imaging device of any one of claims 2-6 for non-destructive testing using spatial intensity distribution of transmitted thermal neutrons.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345565A (en) * | 2020-11-25 | 2021-02-09 | 安徽省城建设计研究总院股份有限公司 | Neutron transmission imaging system for assembly type wall detection and application thereof |
| CN113075241A (en) * | 2021-04-01 | 2021-07-06 | 中国原子能科学研究院 | Neutron imaging and X-ray imaging systems, methods, and apparatus |
| CN113101541A (en) * | 2021-03-16 | 2021-07-13 | 青岛中际康医疗科技有限公司 | Neutron diagnosis and treatment device and method based on neutron field measurement and inversion |
| CN115541635A (en) * | 2022-11-25 | 2022-12-30 | 中国工程物理研究院材料研究所 | D-T neutron imaging method and system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599515A (en) * | 1984-01-20 | 1986-07-08 | Ga Technologies Inc. | Moderator and beam port assembly for neutron radiography |
| JPH0282188A (en) * | 1988-09-20 | 1990-03-22 | Power Reactor & Nuclear Fuel Dev Corp | Neutron detector for fast neutron |
| US5296712A (en) * | 1992-11-12 | 1994-03-22 | Grumman Aerospace Corporation | Detector time-gating for neutron radiographic imaging |
| JP2002257996A (en) * | 2001-03-06 | 2002-09-11 | Hitachi Ltd | Neutron generating device |
| RU2362148C1 (en) * | 2007-12-06 | 2009-07-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" | Radiographic device |
| CN106373630A (en) * | 2016-10-11 | 2017-02-01 | 吉林大学 | Neutron moderation multiplication and collimation device |
| CN109541671A (en) * | 2019-01-25 | 2019-03-29 | 中国科学院合肥物质科学研究院 | A kind of high-resolution neutron photography system |
| US20190317229A1 (en) * | 2018-04-11 | 2019-10-17 | Phoenix Llc | Neutron imaging systems and methods |
| CN111968768A (en) * | 2020-08-14 | 2020-11-20 | 兰州大学 | Nuclear fuel burnup depth measuring device and method based on active neutron space intensity distribution |
| CN212256936U (en) * | 2020-08-14 | 2020-12-29 | 兰州大学 | Nuclear fuel burnup depth measuring device based on active neutron space intensity distribution |
-
2020
- 2020-08-14 CN CN202010815745.9A patent/CN111982940A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4599515A (en) * | 1984-01-20 | 1986-07-08 | Ga Technologies Inc. | Moderator and beam port assembly for neutron radiography |
| JPH0282188A (en) * | 1988-09-20 | 1990-03-22 | Power Reactor & Nuclear Fuel Dev Corp | Neutron detector for fast neutron |
| US5296712A (en) * | 1992-11-12 | 1994-03-22 | Grumman Aerospace Corporation | Detector time-gating for neutron radiographic imaging |
| JP2002257996A (en) * | 2001-03-06 | 2002-09-11 | Hitachi Ltd | Neutron generating device |
| RU2362148C1 (en) * | 2007-12-06 | 2009-07-20 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" | Radiographic device |
| CN106373630A (en) * | 2016-10-11 | 2017-02-01 | 吉林大学 | Neutron moderation multiplication and collimation device |
| US20190317229A1 (en) * | 2018-04-11 | 2019-10-17 | Phoenix Llc | Neutron imaging systems and methods |
| CN109541671A (en) * | 2019-01-25 | 2019-03-29 | 中国科学院合肥物质科学研究院 | A kind of high-resolution neutron photography system |
| CN111968768A (en) * | 2020-08-14 | 2020-11-20 | 兰州大学 | Nuclear fuel burnup depth measuring device and method based on active neutron space intensity distribution |
| CN212256936U (en) * | 2020-08-14 | 2020-12-29 | 兰州大学 | Nuclear fuel burnup depth measuring device based on active neutron space intensity distribution |
Non-Patent Citations (2)
| Title |
|---|
| 丁大钊等: "《中子物理学-原理、方法与应用》", 30 September 2005 * |
| 孙凤春等: "《中国核科学技术进展报告》", 31 May 2014 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112345565A (en) * | 2020-11-25 | 2021-02-09 | 安徽省城建设计研究总院股份有限公司 | Neutron transmission imaging system for assembly type wall detection and application thereof |
| CN113101541A (en) * | 2021-03-16 | 2021-07-13 | 青岛中际康医疗科技有限公司 | Neutron diagnosis and treatment device and method based on neutron field measurement and inversion |
| CN113101541B (en) * | 2021-03-16 | 2023-03-07 | 国科中子刀(青岛)医疗科技有限公司 | Neutron diagnosis and treatment device and method based on neutron field measurement and inversion |
| CN113075241A (en) * | 2021-04-01 | 2021-07-06 | 中国原子能科学研究院 | Neutron imaging and X-ray imaging systems, methods, and apparatus |
| CN115541635A (en) * | 2022-11-25 | 2022-12-30 | 中国工程物理研究院材料研究所 | D-T neutron imaging method and system |
| CN115541635B (en) * | 2022-11-25 | 2023-03-10 | 中国工程物理研究院材料研究所 | D-T neutron imaging method and system |
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