CN112986288B - Detection device and detection method for direct neutron radiography nondestructive detection of radioactive sample - Google Patents
Detection device and detection method for direct neutron radiography nondestructive detection of radioactive sample Download PDFInfo
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- CN112986288B CN112986288B CN202110178233.0A CN202110178233A CN112986288B CN 112986288 B CN112986288 B CN 112986288B CN 202110178233 A CN202110178233 A CN 202110178233A CN 112986288 B CN112986288 B CN 112986288B
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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
Abstract
The invention discloses a detection device for direct neutron photograph nondestructive detection of radioactive samples, which comprises: the neutron source, sample platform, neutron light path transmission system and neutron detection system. The neutron source, the sample stage, the neutron optical path transmission system and the neutron detection system are sequentially arranged along a first direction. The neutron optical path transmission system is arranged between the sample platform and the neutron detection system, and the length of the neutron optical path transmission system can be set according to the property of the detection sample, so that the distance between the detection sample and the neutron detection system is prolonged, the influence of the radioactivity of the detection sample on the neutron imaging detection system can be greatly reduced, and the detection imaging of the neutron detection system can be hardly influenced. Therefore, the detection device for the direct neutron photography nondestructive testing of the radioactive sample can utilize a direct neutron imaging method to carry out the neutron photography nondestructive testing on the radioactive sample.
Description
Technical Field
The invention relates to the technical field of radioactive material detection, in particular to a detection device and a detection method for direct neutron radiography nondestructive detection of a radioactive sample.
Background
Neutron radiography is a non-destructive inspection technique. Neutron photography has wide application because of the advantages of deep penetration, capability of distinguishing isotopes and adjacent elements and the like. The neutron radiography technique can be classified into a direct neutron imaging method and an indirect neutron imaging method. Among them, the direct neutron imaging method is more widely applied. However, in the direct neutron imaging method, the neutron imaging detection system is usually very close to the sample, and the neutron imaging detection system cannot perform neutron photo nondestructive detection on the radioactive sample.
Disclosure of Invention
The invention mainly aims to provide a detection device and a detection method for direct neutron photograph nondestructive detection of a radioactive sample, which can carry out neutron photograph nondestructive detection on the radioactive sample by utilizing a direct neutron imaging method.
In order to achieve the above object, the present invention provides a detection apparatus for direct neutron photographic nondestructive detection of a radioactive sample, comprising: the neutron source is used for generating neutron beam current for neutron photograph nondestructive detection; the sample stage is used for placing a detection sample; the neutron optical path transmission system is used for transmitting neutron beam current; and the neutron detection system is used for receiving the neutron beam current and recording the detection imaging information. The neutron source, the sample stage, the neutron optical path transmission system and the neutron detection system are sequentially arranged along a first direction.
The invention provides a detection method for direct neutron photograph nondestructive detection of radioactive samples, which comprises the following steps: the neutron source, the sample stage, the neutron optical path transmission system and the neutron detection system are sequentially arranged along a first direction; placing a detection sample on the sample table, starting the neutron source to generate a neutron beam, and controlling the neutron beam to penetrate through the detection sample and enter the neutron optical path transmission system for transmission; and the neutron detection system receives the neutron beam current emitted from the neutron optical path transmission system and records detection imaging information.
As described above, the present invention provides a detection apparatus and a detection method for direct neutron radiography nondestructive detection of radioactive samples, wherein a neutron optical path transmission system is arranged between a sample stage and a neutron detection system, and the length of the neutron optical path transmission system can be set according to the properties of the detected samples, so as to lengthen the distance between the detected samples and the neutron detection system, thereby greatly reducing the influence of the radioactivity of the detected samples on the neutron imaging detection system, and hardly influencing the detection imaging of the neutron detection system. Thus, the detection device for the direct neutron photograph nondestructive detection of the radioactive sample can perform the neutron photograph nondestructive detection on the radioactive sample by utilizing the direct neutron imaging method.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic structural diagram of a detection apparatus for direct neutron photographic nondestructive testing of radioactive samples according to some embodiments of the present invention;
FIG. 2 is a schematic illustration of a process for using a detection apparatus for direct neutron photographic nondestructive testing of a radioactive sample according to some embodiments of the present invention;
FIG. 3 is a schematic flow diagram of an inspection method for direct neutron photographic nondestructive inspection of radioactive samples according to some embodiments of the present invention;
FIG. 4 is a schematic flow diagram of an inspection method for direct neutron photographic nondestructive inspection of radioactive samples according to some embodiments of the present invention;
FIG. 5 is a schematic flow diagram of an inspection method for direct neutron photographic nondestructive inspection of radioactive samples according to some embodiments of the invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of reference numerals:
110. a neutron source; 130. a sample stage; 132. a tray; 134. a rotating structure; 150. a neutron optical path transmission system; 152. a pipe body; 154. an end plate; 156. neutron super mirror reflection coating; 170. a neutron detection system; 200. and (5) detecting the sample.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.
FIG. 1 is a schematic structural diagram of an inspection apparatus for direct neutron photographic nondestructive testing of radioactive samples according to some embodiments of the present invention. As shown in fig. 1, the detection apparatus includes: neutron source 110, sample stage 130, neutron optical path transmission system 150, and neutron detection system 170. In the embodiment shown in fig. 1, the neutron source 110, the sample stage 130, the neutron optical path transmission system 150, and the neutron detection system 170 are sequentially arranged along a first direction from left to right.
The neutron source 110 is used for generating a neutron beam current for neutron photo nondestructive testing.
In one embodiment, the sample stage 130 includes a tray 132 and a rotating structure 134. The tray 132 is used for placing the test sample 200. The tray 132 is fixedly installed at one end of the rotating structure 134 so as to be rotated by the rotating structure 134. For example, the tray 132 can be rotated within 360 degrees by the rotation structure 134. The rotating structure 134 may be a rotating shaft or the like driven by a motor or the like.
The neutron optical path transmission system 150 is located between the sample stage 130 and the neutron detection system 170, and is used for transmitting a neutron beam and adjusting the distance between the sample stage 130 and the neutron detection system 170. The neutron optical transmission system 150 is a vacuum tubular structure that includes a hollow tube 152, an end plate 154, and a neutron reflecting cladding 156.
When the neutron optical path transmission system 150 is positioned between the stage 130 and the neutron detection system 170, the axial direction of the tube body 152 is directed from the stage 130 to the neutron detection system 170. The length of the tube body 152 is used to adjust the distance between the sample stage 130 and the neutron detection system 170, and thus, an appropriate length may be selected according to the property of the test sample 200, and the like. In one embodiment, the length of the tube 152 is about 10 meters, which can greatly reduce the influence of radioactivity in the test sample 200 on the neutron imaging detection system.
The neutron super mirror plating 156 is a reflective layer disposed on the inner surface of the tube 152. In one embodiment, the reflectivity of the neutron reflecting cladding 156 is greater than or equal to 4. The neutron reflecting coating 156 is used to make the neutrons mainly totally reflected in the direction perpendicular to the axial direction of the tube 152, reducing the intensity loss due to absorption and projection, and thus realizing long-distance transmission of neutrons.
In the embodiment shown in fig. 1, along the axial direction of the tube body 152, i.e. the first direction, the neutron source 110, the sample stage 130, the neutron optical path transmission system 150 and the neutron detection system 170 are arranged in sequence; also, one of the two end plates 154 in the neutron optical path transmission system 150 is directly adjacent to the sample stage 130, while the other of the two end plates 154 in the neutron optical path transmission system 150 is directly adjacent to the neutron detection system 170.
The neutron detection system (70) is configured to receive the neutron beam current and record detection imaging information the neutron detection system 170 may directly acquire digital imaging, providing digital imaging data for three-dimensional data reconstruction.
The above is a specific structure of the detection device for direct neutron radiography nondestructive detection of radioactive samples according to some embodiments of the present invention, and the working process thereof is briefly described below.
FIG. 2 is a schematic illustration of a process for using a detection apparatus for direct neutron photographic nondestructive testing of a radioactive sample according to some embodiments of the present invention. As shown in fig. 2, when performing a detection experiment using the detection apparatus shown in fig. 1, a detection sample 200 is first placed on a sample stage 130; then, the neutron source 110 is activated to generate a neutron beam, and the neutron beam is controlled to penetrate the test sample 200. When the neutron beam generated by the neutron source 110 penetrates through the detection sample 200, the neutrons and the atomic nuclei of the detection sample 200 undergo nuclear reactions such as scattering and absorption, so that the intensity of the transmitted neutrons is weakened, the attenuation coefficients of the incident neutrons caused by different materials and different thicknesses of the detection sample 200 are different, and the internal component and structure information of the detection sample 200 can be obtained according to the intensity difference of the transmitted neutrons. In the process, the rotation of the sample stage 130 within 360 degrees can be controlled according to actual needs, so that the two-dimensional detection or the three-dimensional detection of the detection sample 200 can be realized.
The neutrons transmitted from the test sample 200 then enter the neutron optical path transmission system 150 and are transmitted in a first direction toward the neutron detection system 170. In the neutron optical path delivery system 150, a portion of the neutron beam 1104 is transmitted in the tube 152 of the neutron optical path delivery system 150 in a first direction toward the neutron detection system 170; part of the neutron beams 1102A/1106A hit on the tube wall of the tube body 152 of the neutron optical path transmission system 150 and are totally reflected by the neutron super mirror reflection coating 156 provided on the inner surface of the tube body 152. The reflected neutron beams 1102B/1106B continue to be transmitted in the tubes 152 of the neutron optical path transmission system 150 in a first direction toward the neutron detection system 170. The specular coating 156 of the neutron super mirror makes the neutrons mainly totally reflected in the direction perpendicular to the axial direction of the tube body 152, reducing the intensity loss due to absorption and projection, thereby realizing long-distance transmission of the neutrons.
After the partial neutron beam 1102A/1106A and the partial neutron beam 1104 exit the neutron optical path transmission system 150, the neutron beam hits the neutron detection system 170 and detection imaging information is recorded by the neutron detection system 170.
The above is the specific structure and working process of the detection apparatus for direct neutron radiography nondestructive detection of radioactive samples according to some embodiments of the present invention, and the detection method for direct neutron radiography nondestructive detection of radioactive samples using the detection apparatus is briefly described below.
FIG. 3 is a schematic flow diagram of an inspection method for direct neutron photographic nondestructive inspection of radioactive samples according to some embodiments of the present invention. As shown in fig. 3, the detection method includes:
step 330: the neutron source 110, the sample stage 130, the neutron optical path transmission system 150 and the neutron detection system 170 are sequentially arranged along a first direction;
step 350: placing a detection sample 200 on a sample table 130, starting a neutron source 110 to generate a neutron beam, and controlling the neutron beam to penetrate through the detection sample 200 and enter a neutron optical path transmission system 150 for transmission;
step 370: the neutron detection system 170 receives the neutron beam current emitted from the neutron optical path transmission system 150 and records the detection imaging information.
Thus, by the steps, the direct neutron imaging method can be used for carrying out neutron photography nondestructive testing on the radioactive sample.
In one embodiment, as shown in fig. 4, before step 330, the detection method further includes:
step 310: the length of the neutron optical path transmission system 150, i.e., the distance between the sample stage 130 and the neutron detection system 170, is determined based on the properties of the test sample 200.
In this step, the length of the neutron optical path transmission system 150 (i.e., the length of the tube 152 in the neutron optical path transmission system 150) is set according to the property of the test sample 200, and the like, so that the distance between the test sample 200 and the neutron detection system 170 is lengthened, and the influence of the radioactivity of the test sample 200 on the neutron imaging detection system 170 can be greatly reduced, and the detection imaging of the neutron detection system 170 is hardly influenced.
In an embodiment, as shown in fig. 5, step 350 specifically includes:
step 352: placing the detection sample 200 on the sample table 130, and controlling the sample table 130 to rotate;
step 354: the neutron source 110 is started to generate a neutron beam current, and the neutron beam current is controlled to penetrate through the detection sample 200 and enter the neutron optical path transmission system 150 for transmission.
In this step, the rotation of the sample stage 130 within 360 degrees can be controlled according to actual needs, so as to implement two-dimensional detection or three-dimensional detection on the detection sample 200. Meanwhile, the neutron beam reflected coating 156 arranged on the neutron super mirror of the neutron optical path transmission system 150 can make the neutron mainly totally reflect in the axial direction perpendicular to the tube body 152, and reduce the intensity loss caused by absorption and projection, thereby realizing the long-distance transmission of the neutron, and further ensuring that the intensity of the neutron beam transmitted to the neutron imaging detection system 170 meets the imaging requirements of the detection experiment.
As described above, the present invention provides a detection apparatus and a detection method for direct neutron radiography nondestructive detection of radioactive sample, wherein the neutron optical path transmission system 150 is arranged between the sample stage 130 and the neutron detection system 170, and the length of the neutron optical path transmission system 150 (i.e. the length of the tube 152 in the neutron optical path transmission system 150) can be set according to the property of the detection sample 200, so as to lengthen the distance between the detection sample 200 and the neutron detection system 170, thereby greatly reducing the influence of the radioactivity of the detection sample 200 on the neutron imaging detection system 170, and hardly influencing the detection imaging of the neutron detection system 170. Meanwhile, the neutron beam reflected coating 156 arranged in the tube body 152 of the neutron optical path transmission system 150 can make the neutrons mainly totally reflected in the axial direction perpendicular to the tube body 152, and reduce the intensity loss caused by absorption and projection, thereby realizing the long-distance transmission of the neutrons, and further ensuring that the intensity of the neutron beam transmitted to the neutron imaging detection system 170 meets the imaging requirements of the detection experiment. In summary, according to the detection apparatus and the detection method for direct neutron radiography nondestructive detection of a radioactive sample in an embodiment of the present invention, a direct neutron imaging method can be used to perform neutron radiography nondestructive detection on the radioactive sample.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (10)
1. A testing apparatus for direct neutron photographic nondestructive testing of a radioactive sample, comprising:
a neutron source (110) for generating a neutron beam for neutron photo nondestructive testing;
a sample stage (130) for placing a test sample;
a neutron optical path transmission system (150) for transmitting a neutron beam; and
the neutron detection system (170) is used for receiving the neutron beam current and recording detection imaging information;
wherein the neutron source (110), the sample stage (130), the neutron optical path transmission system (150) and the neutron detection system (170) are sequentially arranged along a first direction;
the neutron optical path transmission system (150) is of a vacuum tubular structure;
the inner surface of the neutron optical path transmission system (150) is provided with a neutron super mirror reflection coating (156);
the neutron optical path transmission system (150) comprises a hollow tube body (152) and an end plate (154); the end plates (154) are arranged at two ends of the tube body (152) and seal the tube body (152); the neutron super mirror reflection coating (156) is a reflection layer arranged on the inner surface of the tube body (152);
the end plate (154) is a metal plate.
2. The detection device according to claim 1, wherein: the sample stage (130) is rotatably disposed between the neutron source (110) and the neutron optical path transmission system (150).
3. The detection device according to claim 2, wherein: the sample stage (130) comprises a tray (132) and a rotating structure (134); the tray (132) is fixedly mounted to the rotating structure (134).
4. The detection device according to claim 3, wherein: the rotating structure (134) is a rotating shaft.
5. The detection device according to claim 1, wherein: the end plate (154) is an aluminum plate.
6. The detection device according to claim 1, wherein: the reflectivity of the neutron super mirror reflective coating (156) is greater than or equal to 4.
7. The detection device according to claim 1, wherein: the neutron detection system (170) includes a neutron conversion screen and a camera.
8. An inspection method for direct neutron photographic nondestructive inspection of radioactive samples, performed with the inspection apparatus according to any one of claims 1 to 7, comprising:
the neutron source, the sample stage, the neutron optical path transmission system and the neutron detection system are sequentially arranged along a first direction;
placing a detection sample on the sample table, starting the neutron source to generate a neutron beam, and controlling the neutron beam to penetrate through the detection sample and enter the neutron optical path transmission system for transmission;
and the neutron detection system receives the neutron beam current emitted from the neutron optical path transmission system and records detection imaging information.
9. The detection method according to claim 8, characterized in that: before the neutron source, the sample stage, the neutron optical path transmission system and the neutron detection system are sequentially arranged along the first direction, the detection method further comprises the following steps:
and determining the length of the neutron optical path transmission system according to the property of the detection sample.
10. The detection method according to claim 8, characterized in that: placing a detection sample on the sample table, starting the neutron source to generate a neutron beam, and controlling the neutron beam to penetrate through the detection sample and enter the neutron optical path transmission system for transmission, wherein the method comprises the following steps:
placing a detection sample on the sample table, and controlling the sample table to rotate;
and starting the neutron source to generate neutron beam current, and controlling the neutron beam current to penetrate through the detection sample and enter the neutron optical path transmission system for transmission.
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