A shielding material and a boron neutron capture therapy device

Abstract

This utility model relates to a shielding material and a boron neutron capture therapy device, comprising a carbon fiber reinforced layer and a neutron shielding layer. The neutron shielding layer is formed on the surface of the carbon fiber reinforced layer by spraying and penetrates into the carbon fiber reinforced layer. The carbon fiber reinforced layer and the neutron shielding layer are stacked. At least one layer of the carbon fiber reinforced layer is provided on the side of the neutron shielding layer, which has the advantages of excellent neutron shielding effect, lightweight characteristics and high mechanical properties.

Description

Technical Field

[0001] This utility model relates to the technical field of radiation protection, and in particular to a shielding material and a boron neutron capture therapy device. Background Technology

[0002] During the operation of BNCT (Boron Neutron Capture Therapy) equipment, to ensure treatment accuracy and the safety of surrounding personnel, effective neutron radiation protection must be implemented for the critical components of the equipment and the surrounding environment. For example, shielding materials should be installed at corresponding locations on the BNCT equipment.

[0003] Existing shielding materials typically include two types: high-density dielectric materials (such as lead, steel, or concrete) and polymer-based neutron shielding materials.

[0004] While the former has a certain shielding capability, it significantly increases the overall weight of the BNCT device, limiting the flexibility of the treatment device's structural design and layout. This is particularly disadvantageous in treatment environments with limited space or strict weight restrictions. It also increases the burden on the device (such as causing greater stress on the device at the location where the shielding material is installed, and weakening the structural strength).

[0005] While the latter has a lower density, it suffers from insufficient heat resistance and performance degradation under long-term neutron irradiation, making it difficult to meet the stable operation requirements of complex irradiation environments. Furthermore, continuous irradiation may cause hydrogen embrittlement, structural relaxation, or a decrease in shielding performance, making it difficult to meet the requirements of BNCT equipment for high stability, maintainability, and long-term safe operation. Utility Model Content

[0006] The technical problem to be solved by this invention is to overcome the defects in the prior art, thereby providing a shielding material and a boron neutron capture therapy device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A shielding material includes a carbon fiber reinforcement layer and a neutron shielding layer, wherein the neutron shielding layer is formed on the surface of the carbon fiber reinforcement layer by spraying and penetrates into the carbon fiber reinforcement layer. The carbon fiber reinforcement layer and the neutron shielding layer are stacked together; The neutron shielding layer has at least one layer of carbon fiber reinforcement on its side.

[0008] In the above scheme, at least one carbon fiber reinforcement layer is provided on the side of the neutron shielding layer of the shielding material. On the one hand, the carbon fiber reinforcement layer can provide sufficient mechanical support to the neutron shielding layer to improve the problem of the neutron shielding layer being prone to cracking; on the other hand, the shielding material formed by stacking the carbon fiber reinforcement layer and the neutron shielding layer can also meet the requirements of lightweight shielding material.

[0009] Furthermore, in the neutron shielding layer, the neutron moderation and absorption process generates heat. Since the carbon fiber reinforcement layer has good thermal conductivity, it can serve as a heat conduction path to help dissipate heat evenly from the neutron shielding layer to the outside, thus improving the problem of local overheating of the neutron shielding layer leading to a decrease in its shielding performance.

[0010] In other words, the shielding material in this scheme achieves a synergistic unity of structural mechanical properties and neutron shielding performance.

[0011] Preferably, the neutron shielding layer is made of a composite material combining boron carbide and epoxy resin.

[0012] In the above scheme, hydrogen atoms in the epoxy resin matrix act as excellent moderators in the neutron shielding layer. Fast neutrons undergo elastic collisions with hydrogen nuclei of similar mass, rapidly losing energy and being moderated into thermal neutrons. Meanwhile, boron carbide dispersed in the epoxy resin is a highly efficient thermal neutron absorber, which can harmlessly eliminate neutrons without producing strong gamma rays.

[0013] Preferably, the boron carbide is in particulate form and is mixed in epoxy resin; the particle size ranges from 1 μm to 5 μm. And / or, The boron carbide is in particulate form and is mixed in epoxy resin; the average particle size of the particulates ranges from 3 μm to 4 μm. And / or, The composite material is an epoxy resin containing 50 wt% boron carbide microparticles.

[0014] In the above scheme, boron carbide is set in a particulate state, and the particle size of the particulates is reasonably set. When boron carbide in particulate state is mixed in epoxy resin, it can increase the uniformity of the mixing of boron carbide and epoxy resin. After boron carbide is sprayed onto the end face of the carbon fiber reinforcement layer (that is, the end face perpendicular to the thickness direction of the shielding material) along with the epoxy resin, boron carbide can be distributed more evenly on the end face of the carbon fiber reinforcement layer, ensuring the shielding effect of the shielding material.

[0015] Furthermore, properly setting the weight distribution between boron carbide microparticles and epoxy resin is also beneficial to ensuring the shielding effect of the neutron shielding layer.

[0016] Preferably, the carbon fiber reinforcement layer and the neutron shielding layer are stacked alternately; And / or, The neutron shielding layer has at least two layers; And / or, The carbon fiber reinforcement layer consists of at least two layers.

[0017] In the above scheme, the shielding material formed is a periodic multilayer structure with alternating carbon fiber reinforcement layers and neutron shielding layers, which can further increase the structural strength of the shielding material, effectively decelerate and capture neutrons, and improve the overall wear resistance and radiation resistance.

[0018] Preferably, the thickness of the carbon fiber reinforcement layer ranges from 0.1mm to 0.3mm, and the thickness of the neutron shielding layer ranges from 0.8mm to 1.2mm. And / or, The tensile strength of the carbon fiber reinforcement layer is not less than 4500 MPa; And / or, The Young's modulus of the carbon fiber reinforcement layer is not less than 200 GPa; And / or, The density of the carbon fiber reinforcement layer ranges from: .

[0019] Preferably, it further includes a neutron-assisted absorption layer; The weight of the neutron-assisted absorbing layer is less than the sum of the weights of the carbon fiber reinforced layer and the neutron shielding layer.

[0020] In the above scheme, the neutron-assisted absorbing layer can replace part of the carbon fiber reinforcement layer and the neutron shielding layer. Furthermore, the neutron-assisted absorbing layer is lightweight, which can further reduce the overall density (i.e., weight) of the shielding material, thereby further meeting the lightweight requirements of the shielding material while ensuring the shielding performance of the shielding material.

[0021] Preferably, the neutron-assisted absorption layer is configured as a BN foam core material, boron-doped polyethylene, or polyurethane foam; And / or, Along the thickness direction of the shielding material, the neutron-assisted absorption layer is located in the middle of the shielding material.

[0022] In the above scheme, the neutron-assisted absorption layer uses BN foam core material, boron-doped polyethylene or polyurethane foam, which can effectively reduce the overall density of the shielding material and meet the lightweight requirements of the shielding material.

[0023] Furthermore, a neutron-assisted absorbing layer is set at the middle position along the thickness direction of the shielding material (that is, the carbon fiber reinforcement layer and the neutron shielding layer are symmetrically distributed on both sides of the neutron-assisted absorbing layer), so that both sides of the neutron-assisted absorbing layer are supported by the alternating stacked structure formed by the carbon fiber reinforcement layer and the neutron shielding layer (it can be understood that the neutron-assisted absorbing layer is clamped), and the force is uniform, which can enhance the structural stability of the neutron-assisted absorbing layer to a certain extent.

[0024] Preferably, it further includes a transition adhesive layer; The transition bonding layer connects the carbon fiber reinforcement layer and the neutron-assisted absorption layer.

[0025] In the above scheme, the transition bonding layer connects the neutron-assisted absorbing layer and the carbon fiber reinforcing layer, which enables the formation of a high-strength bonding interface between the neutron-assisted absorbing layer and the carbon fiber reinforcing layer, buffering the rigidity difference between the two, thereby dispersing the interface stress and further improving the stability of the formed shielding material.

[0026] Preferably, the transition bonding layer is configured as chopped fiber felt.

[0027] A boron neutron capture therapy device includes: An accelerator is used to provide a proton beam with a preset energy range; A target for receiving the proton beam and forming a fast neutron beam; A beam shaping device, including a reflector, at least said reflector being made of the shielding material as described above, for shaping the fast neutron beam.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows: The present invention provides a shielding material in which at least one carbon fiber reinforcement layer is provided on the side of the neutron shielding layer. On the one hand, the carbon fiber reinforcement layer can provide sufficient mechanical support to the neutron shielding layer to improve the problem of easy cracking of the neutron shielding layer; on the other hand, the shielding material formed by stacking the carbon fiber reinforcement layer and the neutron shielding layer can also meet the requirements of lightweight shielding material.

[0029] Furthermore, in the neutron shielding layer, the neutron moderation and absorption process generates heat. Since the carbon fiber reinforcement layer has good thermal conductivity, it can serve as a heat conduction path to help dissipate heat evenly from the neutron shielding layer to the outside, thus improving the problem of local overheating of the neutron shielding layer leading to a decrease in its shielding performance.

[0030] In other words, the shielding material in this scheme achieves a synergistic unity of structural mechanical properties and neutron shielding performance.

[0031] Correspondingly, the boron neutron capture therapy device provided by this utility model has a reflector for its beam shaping device made of the aforementioned shielding material, which enables the reflector to achieve a synergistic unity of structural mechanical properties and neutron shielding performance. The device using this reflector has good shielding performance and is more stable in operation. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0034] Figure 2 for Figure 1 A magnified view of position D in the middle.

[0035] Figure 3 This is a schematic diagram of the structure of Embodiment 2 provided by this utility model.

[0036] Explanation of reference numerals in the attached figures: 1. Carbon fiber reinforcement layer; 2. Neutron shielding layer; 3. Neutron-assisted absorption layer; 4. Transition bonding layer. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Example 1 See Figure 1 and Figure 2 This embodiment provides a shielding material, including a carbon fiber reinforcement layer 1 and a neutron shielding layer 2. The neutron shielding layer 2 is formed on the surface of the carbon fiber reinforcement layer 1 by spraying and penetrates into the carbon fiber reinforcement layer 1.

[0041] It is worth noting that the term "penetration" here refers to the ability of the neutron shielding layer 2 to fill the gaps in the carbon fiber reinforcement layer 1 during the penetration process. The gaps in the carbon fiber reinforcement layer 1 can be gaps formed by processing defects in the carbon fiber reinforcement layer 1, or gap areas formed between surface structures of the carbon fiber reinforcement layer 1 (such as gap areas between adjacent filament bundles).

[0042] Therefore, it is easy to understand that the neutron shielding layer 2 penetrates into the carbon fiber reinforcement layer 1, which can reduce the impact of the processing defects of the carbon fiber reinforcement layer 1 on the structural strength of the shielding material, and can also increase the connection strength between the carbon fiber reinforcement layer 1 and the neutron shielding layer 2.

[0043] Specifically, along the thickness direction of the shielding material (i.e. Figure 1 (as shown in the H direction or the opposite direction of the H direction), the carbon fiber reinforcement layer 1 and the neutron shielding layer 2 are stacked alternately in sequence, and there is a carbon fiber reinforcement layer 1 on both sides of the neutron shielding layer 2.

[0044] Furthermore, the neutron shielding layer 2 has three layers, while the corresponding carbon fiber reinforcement layer 1 has four layers.

[0045] Since "carbon fiber" is typically a high-strength, high-modulus fiber with a carbon content of over 90%, the carbon fiber reinforcement layer 1 possesses extremely high specific strength (strength / density) and specific modulus (modulus / density). Therefore, in this embodiment, the shielding material, with a carbon fiber reinforcement layer 1 on both sides of the neutron shielding layer 2, serves two purposes: firstly, the carbon fiber reinforcement layer 1 provides sufficient mechanical support to the neutron shielding layer 2, mitigating its susceptibility to cracking; secondly, the shielding material formed by stacking the carbon fiber reinforcement layer 1 and the neutron shielding layer 2 also meets lightweight requirements. Furthermore, in the neutron shielding layer 2, the neutron slowing and absorption processes generate heat. Because the carbon fiber reinforcement layer 1 has excellent thermal conductivity, it can act as a heat conduction pathway, helping to evenly dissipate heat from the neutron shielding layer 2 to the outside, thus mitigating the problem of localized overheating leading to a decrease in shielding performance. In other words, the shielding material in this solution achieves a synergistic unity between structural mechanical properties and neutron shielding performance.

[0046] Furthermore, it is worth noting that when neutrons are absorbed by the neutron shielding layer 2, they produce trapped gamma rays. For example, a hydrogen atom capturing a neutron releases a characteristic gamma ray of 2.2 MeV. Materials with high atomic numbers and high density are excellent for protecting against gamma rays. In this scheme, the carbon fiber reinforcing layer 1 is composed of a large number of carbon atoms. Carbon has a high atomic number and high density, which can significantly attenuate the intensity of secondary gamma radiation.

[0047] It is also worth noting that in this embodiment, the shielding material is a periodic multilayer structure with alternating carbon fiber reinforcement layer 1 and neutron shielding layer 2, which can further increase the structural strength of the shielding material, effectively decelerate and capture neutrons, and improve the overall wear resistance and radiation resistance.

[0048] Of course, in some other embodiments, the neutron shielding layer 2 may be provided with one layer (the corresponding carbon fiber reinforcement layer 1 is provided with two layers), two layers (the corresponding carbon fiber reinforcement layer 1 is provided with three layers), or N layers (the corresponding carbon fiber reinforcement layer 1 is provided with N+1 layers).

[0049] Of course, in other embodiments, two or more layers of carbon fiber reinforcement 1 may also be provided on one side of the adjacent neutron shielding layer 2.

[0050] Of course, in other embodiments, only one neutron shielding layer 2 and one carbon fiber reinforcement layer 1 may be provided to form a two-layer shielding material.

[0051] Understandably, the specific stacking method of the neutron shielding layer 2 and the carbon fiber reinforcement layer 1 can be set according to actual needs, as long as the shielding material structure formed by the stacking of the carbon fiber reinforcement layer 1 and the neutron shielding layer 2 is stable and has good shielding performance. That is, the carbon fiber reinforcement layer 1 can support the neutron shielding layer 2 to improve the problem of the neutron shielding layer 2 being prone to cracking; the neutron shielding layer 2 can then ensure the shielding effect of the shielding material.

[0052] See Figure 1 and Figure 2 The neutron shielding layer 2 is made of a composite material combining boron carbide and epoxy resin.

[0053] It is easy to understand that in neutron shielding layer 2, hydrogen atoms in the epoxy resin matrix act as excellent moderators. Fast neutrons collide elastically with hydrogen nuclei of similar mass, rapidly losing energy and being moderated into thermal neutrons. Meanwhile, boron carbide dispersed in the epoxy resin is a highly efficient thermal neutron absorber, which can harmlessly eliminate neutrons without producing strong gamma rays.

[0054] Specifically, boron carbide is in a particulate state (i.e., boron carbide microparticles) and is mixed in epoxy resin.

[0055] Furthermore, the particle size of the microparticles (i.e., boron carbide microparticles) can be set to 1 μm, 3 μm, or 5 μm. It should be understood that the particle size of the boron carbide microparticles can be in the range of 1 μm–5 μm.

[0056] Furthermore, the average particle size of the particles (i.e., boron carbide particles) can be set to 3 μm, 3.5 μm, or 4 μm. It should be understood that the average particle size of the boron carbide particles can be in the range of 1 μm–5 μm.

[0057] It is easy to understand that by setting boron carbide in a particulate state and reasonably setting the particle size, when boron carbide in a particulate state is mixed with epoxy resin, the uniformity of the mixture of boron carbide and epoxy resin can be increased. After the boron carbide is covered by epoxy resin on the end face of carbon fiber reinforcement layer 1 (that is, the end face perpendicular to the thickness direction of the shielding material), the boron carbide can be more evenly distributed on the end face of carbon fiber reinforcement layer 1, ensuring the shielding effect of the shielding material.

[0058] Specifically, the aforementioned composite material is an epoxy resin containing 50 wt% boron carbide microparticles. By reasonably setting the weight distribution between the boron carbide microparticles and the epoxy resin, it is also beneficial to ensure the shielding effect of the neutron shielding layer 2.

[0059] Of course, in other embodiments, boron carbide can also be in a particulate state and the boron carbide particles can be sprayed onto the epoxy resin surface.

[0060] See Figure 2 The thickness H1 of the carbon fiber reinforcement layer 1 can be set to 0.1mm, 0.2mm, or 0.3mm. The thickness H2 of the neutron shielding layer 2 can be set to 0.8mm, 1mm, or 1.2mm.

[0061] It should be understood that the thickness of the carbon fiber reinforcement layer 1 should be within the range of 0.1mm-0.3mm. The thickness of the neutron shielding layer 2 should be within the range of 0.8mm-1.2mm.

[0062] In addition, in some other embodiments, H2 / H1 can be made to meet a certain preset range (e.g., 4-12, which can be set according to actual needs) so that the carbon fiber reinforcement layer 1 can support the neutron shielding layer 2 and the neutron shielding layer 2 has good shielding performance.

[0063] See Figure 1 To ensure the stability of the carbon fiber reinforcement layer 1 structure, T700 high-strength carbon fiber is selected for the carbon fiber reinforcement layer 1. It has excellent strength and rigidity and can be used as a key reinforcing skeleton for the structural strength of the sub-shielding material in the embodiment.

[0064] It should be understood that the carbon fiber reinforcement layer 1 can also adopt other structures, as long as it has sufficient supporting strength. For example, the tensile strength of the carbon fiber reinforcement layer 1 should be no less than 4500 MPa, the Young's modulus of the carbon fiber reinforcement layer 1 should be no less than 200 GPa, and the density of the carbon fiber reinforcement layer 1 should be within [specific range missing]. Within the range.

[0065] Example 2 See Figure 3 Based on the above embodiment one, the difference in this embodiment is that the shielding material also includes a neutron-assisted absorption layer 3.

[0066] Specifically, the neutron-assisted absorbing layer 3 is made of BN foam core material, and its weight is less than the sum of the weights of the carbon fiber reinforced layer 1 and the neutron shielding layer 2.

[0067] Furthermore, the density of BN foam is controlled at... With a pore size distribution between 50–200 μm and a closed-cell state, it possesses excellent thermal insulation, vibration damping, and neutron deceleration and partial absorption functions, significantly reducing the overall structural weight of the shielding material while improving its shielding synergy. In other words, by using a lighter BN foam core material to replace part of the carbon fiber reinforcement layer 1 and neutron shielding layer 2, the overall weight of the shielding material is further reduced while improving its shielding performance.

[0068] It is worth noting that the neutron-assisted absorbing layer 3 has a certain neutron shielding performance, and its mass only needs to be less than the sum of the weights of the carbon fiber reinforced layer 1 and the neutron shielding layer 2. For example, in other embodiments, the neutron-assisted absorbing layer 3 can also be made of boron-doped polyethylene or polyurethane foam.

[0069] Furthermore, along the thickness direction of the shielding material (see...) Figure 1 and Figure 3 The neutron-assisted absorbing layer 3 is located in the middle of the shielding material (in the H direction and the opposite direction of the H direction, i.e., the stacking direction).

[0070] It is easy to understand that by placing a neutron-assisted absorbing layer 3 (i.e., the carbon fiber reinforcing layers 1 and neutron shielding layers 2 are symmetrically distributed on both sides of the neutron-assisted absorbing layer 3) in the middle of the shielding material along its thickness direction, a portion of the carbon fiber reinforcing layers 1 and neutron shielding layers 2 is replaced. Furthermore, the neutron-assisted absorbing layer 3 is lightweight, which further reduces the overall density (i.e., weight) of the shielding material while maintaining its shielding performance. Moreover, the neutron-assisted absorbing layer 3 is located in the middle of the shielding material, supported on both sides by the alternating stacked structure formed by the carbon fiber reinforcing layers 1 and neutron shielding layers 2 (it can be understood that the neutron-assisted absorbing layer 3 is clamped), resulting in uniform stress and enhancing its structural stability to a certain extent.

[0071] See Figure 3 The shielding material also includes a transition bonding layer 4, which is connected between the carbon fiber reinforced layer 1 and the neutron-assisted absorption layer 3.

[0072] It is easy to understand that the transition bonding layer 4 connects the neutron-assisted absorbing layer 3 and the carbon fiber reinforcing layer 1, enabling a high-strength bonding interface to be formed between the neutron-assisted absorbing layer 3 and the carbon fiber reinforcing layer 1, buffering the rigidity difference between the two, thereby dispersing the interface stress and further improving the stability of the formed shielding material.

[0073] Specifically, the transition bonding layer 4 is configured as chopped fiber felt.

[0074] Furthermore, chopped carbon fiber mat can be laid in one or two layers, with its basis weight controlled at [specific value missing]. During processing, resin impregnation and hot pressing are used to form a good bonding interface, which enhances the connection strength between the internal and external structures.

[0075] It is easy to understand that the shielding material in this embodiment exhibits significant multi-layer functional integration and gradient composite characteristics in its structure. It includes multiple alternating layers of carbon fiber reinforcement 1 and neutron shielding layer 2, which together construct the main load-bearing-main shielding composite system. The lightweight BN foam core material inside (i.e., in the middle of the shielding material) provides weight reduction and heat insulation. The main load-bearing-main shielding composite system and the neutron auxiliary absorption layer 3 (BN foam core material) are connected by a transition bonding layer 4 (chopped carbon fiber felt) to balance internal and external stresses, enhance the connection strength between the main load-bearing-main shielding composite system and the neutron auxiliary absorption layer 3 (BN foam core material), and ensure the structural stability of the entire shielding material.

[0076] Furthermore, the overall material density of the actually prepared shielding material is controlled at... Within the range, it is significantly lower than the bulk density of boron carbide. This shielding material combines excellent neutron shielding effect, lightweight characteristics, and high mechanical properties.

[0077] Example 3 This embodiment also provides a boron neutron capture therapy device, which specifically includes an accelerator, a target, and a beam shaping device.

[0078] Specifically, the accelerator is used to provide a proton beam with a preset energy range; the target is used to receive the proton beam and form a fast neutron beam; and the beam shaping device is used to shape the fast neutron beam.

[0079] Furthermore, the beam shaping device includes a reflector. Specifically, the reflector is made of the shielding material provided in Embodiment 1 or the embodiments provided.

[0080] Of course, in other embodiments, the boron neutron capture therapy device may also be equipped with shielding materials at the locations to be shielded as needed.

[0081] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A shielding material, characterized in that, It includes a carbon fiber reinforcement layer (1) and a neutron shielding layer (2), wherein the neutron shielding layer (2) is formed on the surface of the carbon fiber reinforcement layer (1) by spraying and penetrates into the carbon fiber reinforcement layer (1). The carbon fiber reinforcement layer (1) and the neutron shielding layer (2) are stacked together; The neutron shielding layer (2) has at least one layer of the carbon fiber reinforcement layer (1) on its side.

2. The shielding material according to claim 1, characterized in that, The neutron shielding layer (2) is made of a composite material combining boron carbide and epoxy resin.

3. The shielding material according to claim 2, characterized in that, The boron carbide is in particulate form and is mixed in epoxy resin; the particle size ranges from 1 μm to 5 μm. And / or, The boron carbide is in particulate form and is mixed in epoxy resin. The average particle size of the particulates ranges from 3 μm to 4 μm. And / or, The composite material is an epoxy resin containing 50 wt% boron carbide microparticles.

4. The shielding material according to claim 1, characterized in that, The carbon fiber reinforcement layer (1) and the neutron shielding layer (2) are stacked alternately; And / or, The neutron shielding layer (2) has at least two layers; and / or; The carbon fiber reinforcement layer (1) has at least two layers.

5. The shielding material according to claim 4, characterized in that, The thickness of the carbon fiber reinforcement layer (1) ranges from 0.1mm to 0.3mm, and the thickness of the neutron shielding layer (2) ranges from 0.8mm to 1.2mm. And / or, The tensile strength of the carbon fiber reinforcement layer (1) is not less than 4500 MPa; And / or, The Young's modulus of the carbon fiber reinforcement layer (1) is not less than 200 GPa; And / or, The density of the carbon fiber reinforcement layer (1) ranges from 1 to 10. .

6. A shielding material according to any one of claims 1-5, characterized in that, It also includes a neutron-assisted absorption layer (3); The weight of the neutron-assisted absorption layer (3) is less than the sum of the weights of the carbon fiber reinforcement layer (1) and the neutron shielding layer (2).

7. A shielding material according to claim 6, characterized in that, The neutron-assisted absorption layer (3) is configured as BN foam core material, boron-doped polyethylene or polyurethane foam; And / or, Along the thickness direction of the shielding material, the neutron-assisted absorption layer (3) is located in the middle of the shielding material.

8. A shielding material according to claim 6, characterized in that, It also includes a transition adhesive layer (4); The transition bonding layer (4) is connected between the carbon fiber reinforcement layer and the neutron-assisted absorption layer (3).

9. A shielding material according to claim 8, characterized in that, The transition bonding layer (4) is configured as chopped fiber felt.

10. A boron neutron capture therapy device, characterized in that, include: An accelerator is used to provide a proton beam with a preset energy range; A target for receiving the proton beam and forming a fast neutron beam; A beam shaping device, comprising a reflector, at least said reflector being made of a shielding material as described in any one of claims 1-9, for shaping the fast neutron beam.

Images