Detector array for marking neutron beam imaging and detection device

Abstract

The invention relates to a detector array and a detection device for marking neutron beam imaging, a plurality of detector units in the array are arranged at intervals, a vacancy unit is arranged between every two adjacent detector units, each detector unit is a multi-pixel neutron detector with a scintillator array, and the scintillator array is arranged between the detector units. The scintillator array can realize n / gamma discrimination. Crosstalk of neutron signals among the scintillation units can be reduced, interference of background gamma signals can be effectively eliminated, the light collection capacity and the resolution capacity of edge points of the scintillator array can be improved through the special light guide structure design, and height adjustment and angle adjustment of the detector array can be achieved through the detector support.

Description

Technical Field

[0001] This invention pertains to neutron detection technology, specifically relating to a detector array and detection device for marking neutron beam imaging. Background Technology

[0002] A high voltage of 100 keV accelerates d+ ions to bombard a tritium target (T), resulting in T(d,n). 4 The He fusion reaction has a Q value of 17.590 MeV, producing monoenergetic neutrons with an energy of 14.1 MeV, and simultaneously emitting an alpha particle with an energy of approximately 3.5 MeV in the opposite direction of the neutron emission from the center-of-mass system. 4 He), the accompanying alpha particles and emitted neutrons have a strict correspondence in time and space, such as Figure 1 As shown.

[0003] Both neutrons and alpha particles are emitted in the 4π direction and react with any matter they encounter, resulting in a significant scattering background. Furthermore, 14.1 MeV neutrons also react with the target and surrounding matter, contributing a strong activation gamma background. By utilizing the time-space relationship characteristics of neutrons and alpha particles, this background can be effectively eliminated and the signal-to-noise ratio improved; such neutron source devices are called labeled neutron sources.

[0004] Fast neutron radiography is a transmission X-ray imaging method that utilizes the strong penetrating power of fast neutrons to perform non-destructive imaging of macroscopic defects and characteristic structures within objects. Traditional neutron radiography equipment typically consists of a neutron source, collimator, sample, and detector. Because the background radiation scattered by the sample significantly affects the quality of fast neutron radiography, primarily by reducing the signal-to-noise ratio, it lowers the resolution and contrast of key indicators, thus impacting the final detection results. This technology has long been limited in practical application; therefore, reducing the background radiation and improving the signal-to-noise ratio are crucial aspects of fast neutron radiography.

[0005] Labeled neutron beam imaging technology can minimize the interference of scattered neutrons on imaging results. However, it is not yet widely used in practice and is still in the research stage. Current linear array detectors can only use labeled neutron beams to achieve tomographic imaging of the object under test; they cannot achieve overall transmitted neutron imaging, scattered neutron imaging, or fission neutron imaging of the object. To achieve labeled neutron beam imaging, a usable labeled neutron source is required to label the emitted neutrons. Furthermore, to achieve overall imaging of the object under test, a large-area detector array with high position resolution, high time resolution, and n / γ discrimination capabilities is needed. Summary of the Invention

[0006] The present application aims at solving the problems of the prior art, and provides a detector array and device with large area, high position resolution, high time resolution and n / gamma discrimination performance, which can be applied to the imaging process of a labeled neutron beam.

[0007] To achieve the above object, the technical scheme of the present application is as follows.

[0008] A detector array for labeled neutron beam imaging, a plurality of detector units in the array are arranged at intervals, and an empty unit is arranged between two adjacent detector units, the detector unit is a multi-pixel neutron detector with a scintillator array, and the scintillator array can realize n / gamma discrimination.

[0009] Further, in the specific embodiment, the detector array for labeled neutron beam imaging as described above, wherein the plurality of detector units arranged at intervals are arranged in the form of a spherical arc surface or a cylindrical surface with the center of a target point as the center.

[0010] Further, in the specific embodiment, the detector array for labeled neutron beam imaging as described above, wherein the scintillator array of the detector unit is a liquid scintillator array or a plastic scintillator array with n / gamma discrimination capability, such as an EJ276D plastic scintillator array or an OGS organic glass scintillator array.

[0011] Further, in the specific embodiment, the detector array for labeled neutron beam imaging as described above, wherein the detector unit comprises a detector shell, and a scintillator array, a light guide, a photomultiplier tube assembly and a fixing bracket arranged in the shell in sequence, and the fixing bracket keeps the scintillator array, the light guide and the photomultiplier tube assembly in a state of always adhering.

[0012] Further, one side of the light guide coupled with the scintillator array is provided with a plurality of groups of light grooves, each group comprises four light grooves parallel to the respective outer sides of the light guide, the four light grooves of the same group are orthogonal to each other in sequence, the depths of the light grooves of the same group are the same, and the distances between the light grooves and the corresponding outer sides are the same; the depths of the light grooves of different groups are different, and the depths of the light grooves closer to the corresponding outer sides are deeper; each light groove is made into a mirror surface towards the outer side and a diffuse reflection surface towards the inner side.

[0013] Further, the fixing bracket comprises a detector inner compression ring in the shape of a Chinese character field, the detector inner compression ring abuts against the rear end of the photomultiplier tube assembly, the outer side of the detector inner compression ring is provided with a detector connection compression ring, a spring is arranged between the detector inner compression ring and the detector connection compression ring, the outer side of the detector connection compression ring is provided with a tail compression ring, and an adjustable-length compression ring connecting rod is arranged between the tail compression ring and the detector connection compression ring.

[0014] Further, in the specific embodiment, the detector array for marking the neutron beam imaging as described above, wherein the plurality of detector units are arranged at intervals on the arc-shaped detector fixing strip, the arc-shaped detector fixing strip is composed of a plurality of hollow arc-shaped plates, and the plurality of detector units are installed on the plurality of hollow arc-shaped plates, and the adjacent arc-shaped plates are connected by the threaded rods with adjustable lengths; the arc-shaped plates are made of aluminum.

[0015] The application further provides a detection device using the detector array for marking the neutron beam imaging, wherein the detector array is arranged on a detector support, the detector support comprises a lifting platform system and a rotating system, the detector array is installed on a lifting connecting plate of the lifting platform system, and the lifting connecting plate can adjust the height of the detector array under the driving of a lifting motor; the rotating system comprises an arc-shaped guide rail, the lifting platform system is arranged on the arc-shaped guide rail through a slide rail adapter plate, and can move along the arc-shaped guide rail under the driving of a rotating motor, so as to change the measurement angle of the detector array.

[0016] Further, in the specific embodiment, the detection device as described above, wherein the arc-shaped guide rail is provided with a lifting main body support slide rail adapter, the rotating motor is connected with the lifting main body support slide rail adapter through a rotating support long pipe, the lifting main body support slide rail adapter is connected with the slide rail adapter plate, and the lifting main body support slide rail adapter and the slide rail adapter plate move on the arc-shaped guide rail under the driving of the rotating motor, so as to change the measurement angle of the detector array.

[0017] Further, the installation center of the rotating motor is located vertically below the center of the target point.

[0018] Further, in the specific embodiment, the detection device as described above, wherein the multi-pixel neutron detector of the detector array is connected with a data processing system, the height and angle of the multi-pixel detector of the detector array are adjusted through the detector support, so that each detector is kept collimated with the center of the particle source and the distance is kept consistent, and the particle detection is performed.

[0019] The beneficial effects of the application are as follows:

[0020] 1) The detector array of the application is arranged in the form of a spherical arc surface or a cylindrical surface, and can detect the marked neutron beam of a fan-shaped surface;

[0021] 2) There is an empty unit between two adjacent detector units in the detector array, which can reduce the crosstalk of the neutron signals between the scintillation units;

[0022] 3) The scintillator array of the detector has n / γ discrimination function, and can effectively eliminate the interference of the background gamma signals;

[0023] 4) The detector adopts a specially designed light guide structure to improve the light collection capacity and resolution capacity of the edge points of the scintillator array, can maximize the separation of each pixel point of the scintillator array, and improve the position resolution performance;

[0024] 5) The detector adopts a photomultiplier tube to maximize the time resolution capacity, and the signal is less affected by temperature, reduces the interference of scattered neutrons on the measurement signal, and improves the imaging position resolution capacity;

[0025] 6) The detector support can realize the height adjustment and angle adjustment of the detector array. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 T(d,n) is a schematic diagram of the present application. 4 A schematic diagram of the He fusion reaction.

[0027] Figure 2 A schematic diagram of the detector array in the specific embodiment of the present application.

[0028] Figure 3 A schematic diagram of the multi-pixel point neutron detector structure with a scintillator array in the specific embodiment of the present application.

[0029] Among them, A1 is a scintillator array; A2 is a detector shell; A3 is a light guide; A4 is a reflective film; A5 is a circuit board; A6 is a photomultiplier tube assembly; A7 is a fixing support; A8 is a signal connector; A9 is a high-voltage connector.

[0030] Figure 4 A schematic diagram of the fixing support in the specific embodiment of the present application.

[0031] Among them, E1 is a detector inner pressure ring; E2 is a spring; E3 is a spring connecting rod; E4 is a detector connecting pressure ring; E5 is a pressure ring connecting rod; E6 is a tail pressure ring.

[0032] Figure 5 A schematic diagram of the detector support in the specific embodiment of the present application.

[0033] Among them, 1 is a detector fixing strip; 2 is a lifting connecting plate; 3 is a lifting link support plate; 4 is a threading pipe; 5 is a sliding rail adapter plate; 6 is an arc-shaped guide rail; 7 is a lifting machine main body support sliding rail adapter; 8 is a lifting machine fixed plate; 9 is an arc-shaped guide rail connecting plate; 10 is a support shaft; 11 is a rotating motor; 12 is a rotating support long pipe; 13 is a lifting machine upper fixed plate; 14 is a lifting motor; A is a multi-pixel point neutron detector. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] This invention provides a detector array for labeled neutron beam imaging, the array comprising several detector elements (scintillation detector elements), such as... Figure 2 As shown, these detector units are spaced apart, with a gap between two adjacent detector units. Figure 2 The diagram shown depicts the deployed detector array. In practice, it can be arranged in either a spherical or cylindrical pattern. The spherical array is centered on the target center, and in the cylindrical array, each layer of detector units is also centered on the target center as the height is adjusted. This ensures that each detector remains collimated to the particle source center and at a consistent distance. Because each detector unit is separated by an empty space, optimized design shows that this approach can balance detection efficiency and signal-to-noise ratio requirements.

[0036] The detector unit is a multi-pixel neutron detector with a scintillator array, which is capable of n / γ discrimination. Specifically, a liquid scintillator array or a plastic scintillator array with n / γ discrimination capability can be used, such as an EJ276D plastic scintillator array or an OGS plexiglass scintillator array.

[0037] Example

[0038] The structure of the detector unit is as follows Figure 3 As shown, this embodiment provides a specific structure for a multi-pixel neutron detector used for marking neutron beam imaging, including a detector housing A2, and a scintillator array A1, a light guide A3, a photomultiplier tube assembly A6, and a fixing bracket A7 sequentially disposed within the housing. The fixing bracket A7 keeps the scintillator array A1, the light guide A3, and the photomultiplier tube assembly A6 in a close fit at all times.

[0039] This embodiment employs a plastic scintillator array, which is a cuboid structure with a square end face. This embodiment provides a 10×10 plastic scintillator array, comprising 100 plastic scintillator units, providing 100 pixels. The dimensions of a single plastic scintillator are 4.91mm×4.91mm×25mm. This embodiment uses the EJ276D plastic scintillator, or a similar OGS acrylic scintillator can be used instead. By using the EJ276D plastic scintillator or the OGS acrylic scintillator, effective n / γ discrimination can be achieved, effectively eliminating interference from the background γ signal.

[0040] 100 pieces of plastic scintillators are polished on all sides and stacked in a 10x10 structure. Since the neutron incident on the plastic scintillator will generate scintillation photons inside the scintillator, the ESR reflective film is arranged between adjacent single plastic scintillators in the embodiment, so that the generated photons are constrained in the current scintillator unit and cannot be transmitted to the outside of the single plastic scintillator, and finally all output from the light output surface of the plastic scintillator array. The thickness of the ESR reflective film in the embodiment is 0.08 mm. The ESR reflective film is arranged on the side and one bottom surface (the surface away from the light guide) of the entire plastic scintillator array as a light reflection layer, and an aluminum foil is further arranged outside as a protective layer, so that the generated photons are completely constrained in the plastic scintillator array and transmitted to the light output surface. In the embodiment, the ESR reflective film with a thickness of 0.08 mm is used as the light reflection layer on the side and bottom surface of the entire plastic scintillator array, and the aluminum foil with a thickness of 0.03 mm is used as the protective layer on the outermost surface. The light output surface of the plastic scintillator array is coupled with the light guide by using optical glue or optical silicone grease.

[0041] The plastic scintillator array of the embodiment can be replaced by a liquid scintillator array, and the other structures remain unchanged. The liquid scintillator can achieve n / γ effective discrimination, and has better light emitting performance and particle discrimination performance than the plastic scintillator, and is more stable.

[0042] In order to improve the light collection ability and resolution ability of the edge points of the scintillator array, the size and structure of the light guide are carefully designed. The light guide is also a cuboid structure with a square end face, the area of the end face corresponds to the area of the light output surface of the scintillator array, and the coupling surfaces of the two are basically equal in size. A plurality of groups of light splitting grooves are opened on the coupling surface of the light guide and the scintillator array, each group includes four light splitting grooves parallel to the respective outer sides of the light guide, and the four light splitting grooves of the same group are sequentially orthogonal to each other, the depths of the light splitting grooves of the same group are the same, and the distances between the light splitting grooves and the corresponding outer sides are the same; the depths of the light splitting grooves of different groups are different, and the depths of the light splitting grooves closer to the corresponding outer sides are deeper; each light splitting groove is made into a mirror surface towards the outside and a diffuse reflection surface towards the inside.

[0043] Specifically, the light guide in the embodiment is made of K9 glass, the overall size of the light guide is 50mmx50mmx16mm, and three groups of light splitting grooves (i.e. twelve light splitting grooves inside) are arranged. The spacing between adjacent groups of light splitting grooves is equal. In order to achieve the best position resolution effect, the thickness and internal structure of the light guide are carefully designed. In the embodiment, the light splitting grooves are sequentially divided into three groups from inside to outside, the first group is 15mm away from the outermost side of the light guide, and the depth is 3mm; the second group is 10mm away from the outermost side of the light guide, and the depth is 5mm; the third group is 5mm away from the outermost side of the light guide, and the depth is 10mm. The width of each light splitting groove is within 0.3mm, and the inside of the light splitting groove is polished.

[0044] In this embodiment, the light splitting groove is made into a mirror surface towards the outside (i.e. towards the side of the light guide outer edge), and a 0.08mm thick ESR reflective film is used as the reflective layer (the thickness of the reflective layer is consistent with the thickness of the ESR reflective film in the plastic scintillator array). The inner side of the light splitting groove is made into a diffuse reflection surface, which is filled with barium sulfate powder C3.

[0045] Due to the design of the above light guide structure, the light collection ability and resolution ability of the scintillator array edge points are improved, and each pixel point of the scintillator array can be maximally separated to improve the position resolution performance.

[0046] In this embodiment, the photomultiplier tube assembly A6 includes four photomultiplier tubes arranged in a cross shape. The circuit board A5 is arranged on the photomultiplier tube base, the front end is coupled with the light guide using optical silicone grease, and the gap is covered with an ESR reflective film A4 to improve the light collection efficiency of the photomultiplier tube.

[0047] In this embodiment, the diameter of each photomultiplier tube is about one inch, and the four photomultiplier tubes are arranged in a cross shape. The back end of the photomultiplier tube is connected to the circuit board and the fixing bracket. In order to ensure that the circuit board is small enough, the photomultiplier tube circuit board of this embodiment is designed in a two-layer structure. The layer close to the photomultiplier tube is a power supply circuit for high-voltage power supply, which provides working voltage for each photomultiplier tube. The second layer circuit is designed as a voltage regulating circuit, which can finely adjust the working voltage of each photomultiplier tube, ensure the amplification factor of the photomultiplier tube is consistent, and ensure the position resolution effect.

[0048] The fixing bracket A7 is arranged at the back end of the photomultiplier tube assembly A6, so that the scintillator array, the light guide and the photomultiplier tube assembly always maintain a close state, avoiding light loss caused by poor adhesion. For example Figure 4As shown, in this embodiment, the fixing bracket includes a grid-shaped detector inner pressure ring E1, which abuts against the rear end of the photomultiplier tube assembly. A detector connecting pressure ring E4 is located outside the detector inner pressure ring E1. In this embodiment, the detector connecting pressure ring has a square frame structure and is the same size as the detector inner pressure ring. A spring E2 (four springs can be symmetrically arranged) is provided between the detector inner pressure ring E1 and the detector connecting pressure ring E4. The springs are fitted onto spring connecting rods E3, and the elastic force generated by the spring compression keeps the scintillator array, light guide, and photomultiplier tube assembly in a constant state of contact. A tail pressure ring E6 is located outside the detector connecting pressure ring E4, and an adjustable-length pressure ring connecting rod E5 is provided between the tail pressure ring E6 and the detector connecting pressure ring E4. The pressure ring connecting rods can adopt a threaded connecting rod or other structural form, with a total of four rods, allowing independent height adjustment for each photomultiplier tube. Due to the length adjustment function of the pressure ring connecting rods, the light-emitting surfaces of the four photomultiplier tubes can be ensured to be on the same plane, allowing for perfect contact with the light guide. The spring structure of the fixed bracket can apply force to the four photomultiplier tubes during installation, ensuring that the plastic scintillator array, light guide and photomultiplier tube assembly can fit tightly when the detector is working at any angle, without light leakage or insufficient light collection.

[0049] The plastic scintillator array, light guide, photomultiplier tube assembly, and mounting bracket are all housed within the detector housing, which is completely light-proof. The photomultiplier tube's signal and high voltage are connected to external equipment via connectors on the detector housing. The detector housing is an all-aluminum structure, with the exception of the tail end cap, the rest is integrally molded, and its thickness is less than 0.5mm, minimizing the impact of scattering caused by the housing material on imaging detection. The detector tail end cap and the main housing body are secured using eight screw holes on the side, and O-rings are used for sealing to prevent light leakage. The tail end cap has five connectors, including one high-voltage connector A9 and four signal connectors A8. The five connectors can be arranged on the 50mm × 50mm tail end cap.

[0050] In this embodiment, the detector array can be mounted on a detector support to form a detection device, as shown in the specific structure below. Figure 5 As shown. The detector support includes a lifting platform system and a rotating system.

[0051] The multiple pixel point neutron detector A arranged in an array is arranged on the detector fixing strip 1, the detector fixing strip 1 is an arc-shaped detector fixing strip with the target point center as the center, the arc-shaped detector fixing strip 1 is provided with detector fixing units arranged in an array, and the multiple pixel point neutron detector A is arranged at the detector fixing units in intervals. In the embodiment, the multiple pixel point neutron detector A is not arranged in close proximity, but the detectors are arranged at intervals, and one empty detector fixing unit is arranged between two adjacent detectors. In a specific embodiment, in an arc-shaped detector fixing strip with a target point center radius of 2075 mm and an angle of 54.25°, one detector fixing unit is arranged at the side of each detector, and a 16*8 multiple pixel point neutron detector array group is formed, and the center of each detector can be aligned with the target center.

[0052] In the embodiment, the arc-shaped detector fixing strip 1 is composed of multiple hollow arc-shaped plates, the material of the arc-shaped plate is aluminum, and the middle part is hollow, which can ensure the mechanical strength, reduce the surrounding matter of the detector, reduce the background of scattered neutrons, and provide the effect background ratio.

[0053] The multiple arc-shaped plates are used to mount multiple detectors to form different numbers of array detectors. Support rods are designed between the arc-shaped plates to increase the mechanical strength of the plates and reduce deformation. In the embodiment, adjustable length threaded rods are used to support and connect adjacent arc-shaped plates, which is beneficial to adjust the gap between the arc-shaped plates and adapt to detectors of different sizes.

[0054] See Figure 5 , the lifting platform system designed in the embodiment is composed of a lifting connecting plate 2, a lifting link support plate 3, a lifting machine fixing plate 8, a lifting motor 14, a lifting machine upper fixing plate 13, and a support shaft 10, which are assembled under the condition of ensuring the mechanical strength.

[0055] In the embodiment, the lifting connecting plate 2 of the lifting platform system is also designed in an arc shape, and preferably has the same curvature as the arc-shaped detector fixing strip 1, which is compact, beautiful, and easy to adjust and control. The lifting link support plate 3 is also designed in a corresponding structure and has the same curvature as the lifting connecting plate 3.

[0056] A plurality of support columns for increasing stability are arranged at the lower part of the lifting connecting plate 2, the support columns are arranged in sequence along the bottom of the arc-shaped lifting connecting plate, and the support columns pass through the lifting link support plate 3 downward. The detector array group is fixed to the upper surface of the lifting connecting plate 2, when the lifting connecting plate drives the detector array group fixed to the upper surface to move up and down, the sequentially arranged support columns play a guiding and limiting swing function, so that the detector array group can stably move up and down.

[0057] A plurality of support shafts 10 are arranged on the lower part of the lifting linkage support plate 3, and the lower ends of the support shafts 10 are fixed on the slide rail adapter plate 5 of the rotating system, so that the lifting platform system is arranged on the arc-shaped guide rail 6 through the slide rail adapter plate 6, and the lifting platform system can be adjusted in angle along the arc-shaped guide rail.

[0058] In the embodiment, the lifting platform system is driven by the lifting motor 14 to drive the screw transmission mechanism to drive the lifting connecting plate 2 to move up and down, so as to adjust the height of the detector array group. The lifting motor 14 and the screw transmission mechanism are arranged on the lifting machine upper fixing plate 13 on the lifting linkage support plate 3, the screw of the screw transmission mechanism is arranged in a longitudinal direction, the upper end of the screw is fixedly connected to the middle position of the lifting connecting plate 2, the lower end of the screw passes through the lifting linkage support plate 3 and is connected with the lifting machine fixing plate 8, and the four corners of the lifting machine fixing plate 8 are also provided with support columns connected with the bottom of the lifting connecting plate 2. When the screw is driven by the lifting motor 14 to move up and down, the lifting machine fixing plate 8 also moves with the screw, and the stability of the screw in up-down movement is further ensured.

[0059] Since the lifting connecting plate 2 is a relatively thin and long arc-shaped plate, in the embodiment, only one lifting motor drives the lifting connecting plate and the detector array group thereon to move up and down through the screw transmission mechanism, and deviation and swing may occur in transmission. In order to ensure the stability of the lifting platform system, the upper end of the screw is fixed to the middle position of the lifting connecting plate 2, and then passes through the lifting linkage support plate 3 below the lifting connecting plate 2 through the support columns arranged in sequence, so that the lifting connecting plate 2 will not be deviated during up-down movement, and the lifting platform system is more stable.

[0060] In the specific embodiment, the height of the detector array group can be adjusted by the lifting motor 14 driving the lifting connecting plate 2 according to the required height of the experimental sample. As a preferred embodiment, a limit switch can be arranged at the lifting motor, and the limit switch can be controlled to prevent the lifting connecting plate from exceeding the safe distance during up-down movement.

[0061] The rotating system designed in the embodiment is assembled from a rotating motor 11, a rotating support long pipe 12, a lifting machine main body support sliding rail adapter 7, an arc-shaped guide rail 6, a sliding rail adapter plate 5, and an arc-shaped guide rail connecting plate 9. The arc-shaped guide rail 6 is provided with the lifting machine main body support sliding rail adapter 7 and two sliding rail adapter plates 5, the lifting machine main body support sliding rail adapter 7 is located in the middle position, the two sliding rail adapter plates 5 are located on the two sides, and the lifting machine main body support sliding rail adapter 7 and the two sliding rail adapter plates 5 are fixedly connected together through the arc-shaped connecting rods. The rotating motor 11 is connected with the lifting machine main body support sliding rail adapter 7 through the rotating support long pipe 12, the rotating support long pipe 12 is a rectangular frame structure, and a support plate is arranged in the middle to ensure the strength. Under the driving of the rotating motor 11, the lifting machine main body support sliding rail adapter 7 and the sliding rail adapter plate 5 move on the arc-shaped guide rail 6 at the same time, so as to change the measurement angle of the detector area array group.

[0062] The installation center of the rotating motor 11 is perpendicular to the target center and is located directly below the target center, and the rotating motor 11 is fixed with the lifting machine main body support sliding rail adapter 7 through the rotating support long pipe 12. The rotation of the motor drives the lifting machine main body support sliding rail adapter 7 and the sliding rail adapter plate 6 to move on the inner arc-shaped guide rail. Since the lifting platform system is arranged on the arc-shaped guide rail 6 through the sliding rail adapter plate 6, the lifting platform system can be adjusted in angle along the arc-shaped guide rail, so as to realize the multi-angle measurement function of the detector array. In the embodiment, the maximum adjustment angle of the arc-shaped guide rail is 65°, and limit switches are respectively installed on the two sides to ensure that no safety problems such as disengagement from the track occur during the adjustment angle process.

[0063] In the embodiment, the installation position of the support is determined by the target center and the center position of the rotating motor. Since the arc-shaped detector fixing strip 1 is an arc segment with the target center as the center, the arc-shaped guide rail between the two sliding rail adapter plates 5 is an arc segment with the center of the rotating motor as the center, the radian of the above two arc segments is corresponding, and then, as long as the center of the rotating motor is arranged directly below the target center, the distance between each detector and the target center can be kept consistent, so as to realize the accurate installation of the area array type neutron detector support.

[0064] As shown in Figure 5 In the embodiment, the arc-shaped guide rail connecting plates 9 are arranged at the two ends and the middle part of the arc-shaped guide rail 6, the lower part of the arc-shaped guide rail connecting plate 9 is provided with a supporting leg and a roller. The design of the roller facilitates the movement and placement of the whole support, and the supporting leg can be designed as a height-adjustable supporting leg, so as to adjust the levelness of the support and ensure the measurement accuracy of the detector.

[0065] The multi-pixel neutron detector of the detection device is connected with the data processing system, the height and angle of the multi-pixel neutron detector of the detector array are adjusted through the detector support, each detector is kept collimated with the center of the particle source and the distance is kept consistent, and the particle detection is performed.

[0066] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as illustrative only of the preferred embodiments of the application, and that other embodiments of the application falling within the scope of the application are contemplated. Thus, if there is any conflict between what is described in the disclosure and what is disclosed in the specification, it is the disclosure that will control. Factors uniquely found in the prior art can be combined with embodiments of the application to produce modifications Bo within the scope of the application. Thus, the application is not intended to be limited to the embodiments described herein but knows to be amenable to many different types of rearrangement, modification, and substitution of parts and equivalents thereof. Accordingly, the disclosure and examples are intended to be illustrative only and not limiting of the scope of the application, as claimed.

[0067] The above-described embodiments are merely illustrative of the present application, and the present application can be implemented in other specific forms or other specific modes without departing from the gist or essential characteristics of the present application. Therefore, the described embodiments should be considered illustrative in all aspects and not restrictive. The scope of protection of the present application should be determined by the claims, and any changes equivalent to the intent and scope of the claims should be included in the scope of the present application.

Claims

1. A detector array for labeled neutron beam imaging, characterized in that, The array consists of several detector units spaced apart, with a gap between two adjacent detector units. The detector unit is a multi-pixel neutron detector with a scintillator array, which is capable of n / γ discrimination.

2. The detector array for labeled neutron beam imaging as described in claim 1, characterized in that, Several detector units, spaced apart from each other, are arranged in a spherical or cylindrical manner with the target center as the center.

3. The detector array for labeled neutron beam imaging as described in claim 1, characterized in that, The scintillator array of the detector unit is a liquid scintillator array or a plastic scintillator array with n / γ discrimination capability.

4. The detector array for labeled neutron beam imaging as described in claim 3, characterized in that, The plastic scintillator array includes an EJ276D plastic scintillator array or an OGS plexiglass scintillator array.

5. The detector array for labeled neutron beam imaging as described in claim 1, characterized in that, The detector unit includes a detector housing, and a scintillator array, a light guide, a photomultiplier tube assembly, and a fixing bracket arranged sequentially inside the housing. The fixing bracket ensures that the scintillator array, the light guide, and the photomultiplier tube assembly are always in close contact.

6. The detector array for labeled neutron beam imaging as described in claim 5, characterized in that, The optical guide coupled to the scintillator array has multiple groups of optical slots. Each group includes four optical slots that are parallel to the outer edges of the optical guide. The four optical slots in the same group are orthogonal to each other. The optical slots in the same group have the same depth and the same distance from the corresponding outer edge. The optical slots in different groups have different depths, and the optical slots that are closer to the corresponding outer edge have a deeper depth. Each optical slot is made into a mirror surface on the outer side and a diffuse reflection surface on the inner side.

7. The detector array for labeled neutron beam imaging as described in claim 5, characterized in that, The fixed bracket includes a grid-shaped inner pressure ring for the detector, which abuts against the rear end of the photomultiplier tube assembly. A detector connecting pressure ring is provided on the outside of the inner pressure ring. A spring is provided between the inner pressure ring and the detector connecting pressure ring. A tail pressure ring is provided on the outside of the detector connecting pressure ring. An adjustable-length pressure ring connecting rod is provided between the tail pressure ring and the detector connecting pressure ring.

8. The detector array for labeled neutron beam imaging as described in claim 1, characterized in that, The aforementioned detector units are spaced apart on the arc-shaped detector fixing strip, which is composed of multiple layers of hollowed-out arc-shaped flat plates for mounting multiple layers of detector units. Adjacent arc-shaped flat plates are supported and connected by threaded rods of adjustable length; the arc-shaped flat plates are made of aluminum.

9. A detection device employing a detector array for marking neutron beam imaging as described in any one of claims 1-8, characterized in that, The detector array is mounted on a detector support, which includes a lifting platform system and a rotating system. The detector array is mounted on a lifting connecting plate of the lifting platform system, and the lifting connecting plate can adjust the height of the detector array under the drive of a lifting motor. The rotating system includes an arc-shaped guide rail, and the lifting platform system is mounted on the arc-shaped guide rail via a slide rail adapter plate, and can move along the arc-shaped guide rail under the drive of a rotating motor, thereby changing the measurement angle of the detector array.

10. The detection device as described in claim 9, characterized in that, The arc-shaped guide rail is equipped with a lifting platform main support slide rail adapter. A rotary motor is connected to the lifting platform main support slide rail adapter through a long tube of a rotary bracket. The lifting platform main support slide rail adapter is connected to a slide rail adapter plate. Driven by the rotary motor, the lifting platform main support slide rail adapter and the slide rail adapter plate move simultaneously on the arc-shaped guide rail, thereby changing the measurement angle of the detector array.

11. The detection device as described in claim 10, characterized in that, The mounting center of the rotary motor is located directly below the center of the target point, perpendicular to it.

12. The detection device as described in claim 9, characterized in that, The multi-pixel neutron detectors in the detector array are connected to the data processing system. By adjusting the height and angle of the multi-pixel detectors in the detector array, each detector is aligned with the center of the particle source and the distance between them is kept consistent, thus enabling particle detection.

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