Target disc rotation type BNCT neutron target system

Abstract

The utility model provides a target disc rotation type BNCT neutron target system comprising a plurality of target disc assemblies, each target disc assembly comprising a target material backboard and an action layer; the target disc rotating assembly comprises a target material mounting disc, a rotating sealing assembly and a target material rotating shaft, the target material mounting disc is used for annularly and fixedly connecting the multiple target disc assemblies in the circumferential direction of the target material mounting disc, and the target material rotating shaft is fixedly connected with the middle of the target material mounting disc; the target box assembly comprises a box body, a box cover and a target material mounting disc, the target disc assembly is located in the box body, one part of the target material rotating shaft is located in the box body, the other part of the target material rotating shaft extends out of the box body, and the target material rotating shaft and the box body are sealed through a rotating sealing assembly; the power assembly is used for driving the target rotating shaft to drive the target disc assembly to rotate, one end of the flange assembly is fixedly connected with the box body, and the other end of the flange assembly is connected with the particle generating device. The BNCT neutron target solves the problem that a conventional BNCT neutron target is short in service life and scrapped due to the defects such as bubbling in the using process.

Description

Technical Field

[0001] This invention relates to the field of boron neutron capture therapy (BNCT) technology, and in particular to a target disk rotating BNCT neutron target system. Background Technology

[0002] Boron neutron capture therapy (BNCT) is a cutting-edge cancer treatment that combines principles of nuclear physics and biomedicine. The therapy works by accelerating protons to a certain energy level using an accelerator, then bombarding a target with the protons. The neutrons are then shaped to form a neutron beam, which is then reacted with boron-10 (… 10 B) The nuclear reaction property is triggered by selectively delivering boron compounds to cancer cells and irradiating these cells with a neutron beam, thereby releasing high-energy particles that can damage the DNA of cancer cells, leading to cancer cell death.

[0003] The neutron target is a key component of a BNCT (Brain-Neuro-Treating Therapy) device, used to generate a neutron beam for cancer treatment. The selection and design of the neutron target are crucial to the efficacy and safety of BNCT. Neutron targets generally utilize... 9 Be(p, n) 9 B reaction, 7 Li(P, n) 7 Be reaction. However, when using this 9 Be(p, n) 9 In the B reaction, to produce the amount of neutrons required for BNCT, the proton acceleration energy needs to be increased to 30 MeV, and the energy of the produced neutrons will also increase accordingly. And... 7 Li(P, n) 7 In the Be reaction, the acceleration energy of the proton is compared to 9 Be(p, n) 9 Reaction B, set at a lower value of 2.5 MeV, is compared to... 9 Be(p, n) 9 The proton acceleration energy in the B reaction is an order of magnitude lower, and the energy of the produced neutrons is also significantly lower than that of the Be target, resulting in lower energy consumption for decelerating the neutrons. Therefore, in current BNCT... 7 Li(P, n) 7 The utilization of the Be reaction has attracted widespread attention.

[0004] In the accelerator boron neutron capture therapy, the proton beam is accelerated by the accelerator, the proton beam is accelerated to an energy sufficient to overcome the Coulomb repulsion of the target nucleus, and a nuclear reaction occurs with the target to generate neutrons, so that the target will be bombarded by the accelerated proton beam with very high energy level in the process of generating neutrons, a small amount of protons and neutrons in the target occur nuclear reaction to generate neutrons, and a large number of high-speed protons gradually decelerate in the neutron target until the speed is zero and then deposited in the neutron target. The energy of the high-speed protons is absorbed by the neutron target, which causes the temperature of the target to rise sharply, and the metal part of the target is prone to blistering, thereby affecting the service life of the target.

[0005] Patent No. 201911264901.0 discloses a target for a neutron line generating device. Patent No. 202210824444.1 discloses a target for a particle beam generating device. The above patents all use the conventional fixed target method, which prolongs the service life of the target to a certain extent by arranging different heat dissipation layers and anti-bubbling layers. Patent No. 202210788155.0 discloses a lithium target for BNCT, which attempts to solve the problems of neutron target heating and blistering by setting an anisotropic carbon substrate, but its technical solution has certain problems: when no intermediate metal is set, the passing protons cannot be captured; when the intermediate metal is set, the passing protons are captured by the intermediate metal, which is equivalent to the heat of the proton bombardment of the lithium target and the intermediate metal layer being conducted and dissipated through the anisotropic carbon substrate; the heat dissipation of the anisotropic carbon substrate is longer, and the heat conduction distance is shorter than that without the anisotropic carbon substrate.

[0006] The above technical solutions have solved the problems of neutron target heat dissipation and blistering to a certain extent, but the existing solutions all use the fixed target method, and the material load of the active layer for nuclear reaction with protons is small. When the reaction reaches a certain degree, the thickness of the active layer material is significantly reduced, resulting in very low neutron yield, so this type of neutron target has a short service life due to the small load of the active layer material. In addition, the neutron target is radioactive after being bombarded by neutrons due to nuclear reaction or activation, which has a certain degree of pollution and is inconvenient to replace.

[0007] Therefore, it is necessary to propose a new technical solution to solve the above problems. Practical new type content

[0008] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, and provide a target disc rotating type BNCT neutron target system.

[0009] To solve the above technical problems, the utility model adopts the technical scheme basic thought as follows: (1) through the multiple target disc assembly splicing is annular, the load of the action layer material is greatly improved, thereby greatly improving the service life of the neutron target.(2) through setting up the cooling circuit in the target material backboard in the target disc assembly, the target material working process is realized quick cooling;Target disc assembly is arranged as annular through splicing, target disc assembly rotates in working, the particle beam bombardment position is invariable and target disc assembly rotation makes the target material assembly on the action layer is bombarded the part of the moment transformation, greatly reduces the local heat production.(3) compared with the conventional BNCT target material single heat dissipation mode, the target disc assembly of the utility model is not bombarded non-working area also carries out heat dissipation, the heat dissipation effect is greatly improved.

[0010] One key parameter of BNCT neutron target is neutron yield, when the neutron target action layer material is metal lithium, the energy of proton beam and the thickness of action layer greatly influence neutron yield. Through simulation calculation, when the energy of proton beam is 2.2MeV, the thickness of metal lithium layer is about 50μm, the neutron yield is maximum; when the energy of proton beam is 2.5MeV, the thickness of metal lithium layer is about 98μm, the neutron yield is maximum; when the energy of proton beam is 3MeV, the thickness of metal lithium layer is about 188μm, the neutron yield is maximum. This also shows that the conventional BNCT neutron target will affect the neutron yield and thus affect the treatment effect with the increase of use time. The action layer of the target disc rotating type BNCT neutron target system of the utility model is continuous annular after splicing, the action layer load is several times to several tens times of the conventional fixed type BNCT target material, which can keep relatively large neutron yield of the neutron target in a long use cycle.

[0011] Specifically, the utility model provides a kind of target disc rotating type BNCT neutron target system, the BNCT neutron target system includes: multiple target disc assemblies, each target disc assembly includes target material backplate and action layer;Target disc rotating assembly, the target disc rotating assembly includes target material mounting disc, hollow target material rotating shaft and rotating sealing assembly, the target material mounting disc is used to be annularly fixed in its circumferential direction The multiple target disc assemblies, target material rotating shaft is fixed with the middle part of target material mounting disc;Target box assembly, the target box assembly includes box and lid, the target material mounting disc, target disc assembly is located inside target box assembly, part of target material rotating shaft is located inside target box assembly, part extends to the outside of box, target material rotating shaft is sealed between box by rotating sealing assembly;Power assembly and flange assembly, the power assembly is used to drive target material rotating shaft to drive target disc assembly to realize rotating motion, one end of the flange assembly is fixed with box, and the other end is connected with particle generating device, wherein the box is also provided with working hole that is communicated with the flange assembly, the projection of working hole on target material assembly is located on the action layer of the target material assembly.

[0012] Optionally, the material of the active layer comprises at least one of the following materials: lithium, lithium alloy, beryllium, beryllium alloy.

[0013] Optionally, the thickness of the active layer in the target disc assembly is 20-300 μm.

[0014] Optionally, the target disc assembly is composed of 2-20 pieces, and the active layer material forms a complete ring after splicing; preferably, the target disc assembly is composed of one of 4 pieces, 6 pieces, 8 pieces, 10 pieces, and 12 pieces.

[0015] Optionally, the target disc assembly further comprises a hydrogen storage layer between the target backing plate and the active layer; the material of the hydrogen storage layer comprises at least one of the following materials: tantalum, palladium, tantalum alloy, palladium alloy, magnesium alloy, titanium alloy; the thickness of the hydrogen storage layer is 10-100 μm.

[0016] Optionally, the material of the target backing plate in the target disc assembly comprises at least one of the following materials: copper, copper alloy, aluminum, aluminum alloy, carbon-based material; the target backing plate is provided with a channel for the flow of cooling liquid.

[0017] Optionally, the inside of the hollow target rotating shaft is further provided with a hollow cooling liquid conducting pipe coaxial with the target rotating shaft; the channel for the cooling liquid to enter and flow out of the target disc assembly is formed between the inner wall of the target rotating shaft and the outer wall of the cooling liquid conducting pipe and inside the cooling liquid conducting pipe.

[0018] Optionally, the inside of the target mounting disc is provided with a plurality of channels for the cooling liquid to enter or flow out corresponding to the cooling holes in the target disc assembly.

[0019] Optionally, the lid of the target box assembly is provided with a target mounting hole and a mounting cover for closing the target mounting hole.

[0020] Optionally, the power assembly comprises a power element, a power element mounting seat, and a transmission element; preferably, the power element is an electric motor.

[0021] Optionally, the flange assembly comprises a particle beam bombardment channel and a particle beam monitoring channel.

[0022] The target material back plate in the target disc assembly is internally provided with a channel for cooling, after multiple target disc assemblies are installed on the target material mounting disc, the target disc assemblies are spliced into a continuous ring. The target material mounting disc is also internally provided with multiple channels for cooling liquid circulation, and the channels are in correspondence with the channels on the target disc assembly and are in communication, all the cooling liquid in the multiple target disc assemblies enters the channels and converges together on the target material mounting disc, and all the cooling liquid return channels converge together on the target material mounting disc. After the cooling liquid conduction pipe is connected with the target disc rotating shaft and is fixedly connected with the target material mounting disc, one of the cooling liquid enters or returns and flows in the space formed by the inner wall of the target disc rotating shaft and the outer wall of the cooling liquid conduction pipe, and the other cooling liquid flows in the inside of the cooling liquid conduction pipe. Finally, the two liquid channels are respectively conducted through the rotary joint and are connected with the cooling liquid circulating device, and full-time cooling of each target disc assembly is realized.

[0023] After the above technical scheme is adopted, the utility model has the following beneficial effects compared with the prior art:

[0024] 1. By splicing multiple target disc assemblies into a ring, the load of the active layer material is greatly improved, thereby greatly improving the service life of the neutron target.

[0025] 2. The target disc assembly is spliced into a ring, and the target disc assembly rotates during work, so that the particle beam bombardment position does not change, and the target disc assembly rotates to change the position of the active layer on the target disc assembly at any time, which is equivalent to the intermittent working mode of each target disc assembly, thereby greatly reducing the heat production of a single target disc assembly.

[0026] 3. Compared with the conventional single heat dissipation mode of the BNCT target material, the non-working area of the target disc assembly in the utility model is also cooled at any time, and the heat dissipation effect is greatly improved.

[0027] 4. The cooling circuit arranged in the target disc assembly back plate can cool each target disc assembly at any time. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a schematic view of a specific embodiment of the target disc rotating type BNCT neutron target system of the utility model;

[0029] Figure 2 It is Figure 1 a schematic view of different viewing angles in the utility model;

[0030] Figure 3 It is Figure 1 a schematic view of another viewing angle in the utility model;

[0031] Figure 4 It is Figure 3 a sectional view along the depth direction of the view in the utility model;

[0032] Figure 5 It isFigure 1 schematic view of the target assembly in the middle of the assembly process;

[0033] Figure 6 schematic view of the target assembly in the middle of the assembly process; Figure 5 schematic view of the target assembly in the middle of the assembly process;

[0034] Figure 7 schematic view of the target assembly in the middle of the assembly process; Figure 5 schematic view of the target assembly in the middle of the assembly process;

[0035] Figure 8 schematic view of the target assembly in the middle of the assembly process;

[0036] Figure 9 schematic view of the target assembly in the middle of the assembly process; Figure 8 schematic view of the target assembly in the middle of the assembly process;

[0037] Figure 10 schematic view of the target assembly in the middle of the assembly process; Figure 8 schematic view of the target assembly in the middle of the assembly process;

[0038] Figure 11 schematic view of the target assembly in the middle of the assembly process;

[0039] Figure 12 schematic view of the target assembly in the middle of the assembly process; Figure 11 schematic view of the target assembly in the middle of the assembly process.

[0040] Figure number explanation:

[0041] 100 target plate assembly; 110 target backing plate; 111 first cooling hole; 112 second cooling hole; 113 positioning hole; 114 fixing hole; 115 positioning part; 120 action layer; 200 target box assembly; 210 box body; 211 working hole; 220 box cover; 221 target material mounting hole; 230 mounting cover; 300 target plate rotating assembly; 310 target material mounting plate; 311 target material mounting part; 312 rotating shaft mounting part; 313 first channel; 313a first channel target material end; 313b first channel connecting end; 314 second channel; 314a second channel target material end; 314b second channel connecting end; 315 target material positioning hole; 316 target material fixing hole; 320 target plate rotating shaft; 321 rotating shaft flange end; 322 power transmission part; 323 rotating shaft connecting end; 330 rotating sealing assembly; 340 cooling liquid transmission pipe; 341 transmission pipe flange end; 342 transmission pipe connecting end; 350 rotating joint; 351 first pipe; 352 second pipe; 360 first transmission element; 400 power assembly; 410 power element; 420 power element mounting seat; 430 second transmission element; 500 flange assembly; 510 particle beam bombardment channel; 520 particle beam monitoring channel. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the utility model is further described in detail below in combination with the drawings and examples.

[0043] Reference Figures 1 to 4 , the target disc rotating BNCT neutron target system of the utility model mainly includes target disc assembly 100, target box assembly 200, target disc rotating assembly 300, power assembly 400 and flange assembly 500.Target box assembly 200 is formed by box body 210, box cover 220 and mounting cover 230; target material mounting hole 221 is arranged on box cover 220, and mounting cover 230 is used to close target material mounting hole 221; when it is needed to install target material assembly 100, mounting cover 230 is opened, target material assembly 100 is placed into box body 210 from target material mounting hole 221 and is fixed on target material mounting disc 310.Working hole 211 in communication with flange assembly 500 is arranged on box body 210, and the projection of working hole 211 on target material assembly 100 is located on the action layer 120 of target material assembly 100.Flange assembly 500 is connected with the particle beam generator (not shown in the figure) in the upstream, and the particle beam is used to bombard the action layer 120 on target material assembly 100 through working hole 211.

[0044] Reference Figures 4 to 7 , target disc rotating assembly 300 is formed by target material mounting disc 310, target disc rotating shaft 320, rotating sealing assembly 330, cooling liquid conducting pipe 340, rotating joint 350 and first driving element 360.Target disc rotating shaft 320 has rotating shaft flange end 321 for being fixedly connected with target material mounting disc 310, power transmission conducting part 322 for being fixedly connected with first driving element 360 and used to transmit rotating motion and rotating shaft connecting end 323 for being connected with rotating joint 350.Rotating shaft flange end 321 of target disc rotating shaft 320 is fixedly connected with target material mounting disc 310 and is located in the inside of target box assembly 200, power transmission conducting part 322 is located in the outside of target box assembly 200, rotating sealing assembly 330 is used to realize fixed connection with a seal between rotating shaft flange end 321 and power transmission conducting part 322 and box body 210 in target box assembly 200, and after connection, target disc rotating shaft 320 can rotate without damaging the seal.

[0045] Reference Figures 8 to 10 , it is one specific embodiment of the utility model target material mounting disc.By Figure 9 It can be known that in the embodiment, target material mounting disc 310 has six target material mounting parts 311, that is, six target disc assemblies 100 can be installed, and the effect after installation is as shown in Figures 5 to 7As shown, six target disc assemblies 100 form a continuous ring after installation. In this embodiment, the target mounting disc 310 is disc-shaped, and the target mounting portions 311 are uniformly distributed on the edge of the disc. The central portion of the target mounting disc 310 is a rotating shaft mounting portion 312 for connecting with the target disc rotating shaft 320. The target positioning holes 315 and the target fixing holes 316 are arranged at the target mounting portions 311. The first channel 313 and the second channel 314 are arranged between the target mounting portions 311 and the rotating shaft mounting portion 312. The first channel 313 has a first channel target end 313a at one end of the target mounting portion 311, and a first channel connecting end 313b at the other end of the rotating shaft mounting portion 312. The opening of the first channel connecting end 313b is located on the disc surface at the end of the target mounting disc 310 connected with the target disc rotating shaft 320. The opening of the first channel target end 313a is located on the plane of the target mounting portion 311 in contact with the target disc assembly 100. The second channel 314 has a second channel target end 314a at one end of the target mounting portion 311, and a second channel connecting end 314b at the other end of the rotating shaft mounting portion 312. The opening of the second channel connecting end 314b is located at the center of the target mounting disc 310. The opening of the second channel target end 314a is located on the plane of the target mounting portion 311 in contact with the target disc assembly 100. Each target mounting portion 311 is provided with the first channel 313 and the second channel 314 connected to the rotating shaft mounting portion 312. The openings of the first channel connecting ends 313b of all the first channels 313 on the target mounting disc 310 are located on the same plane, and the openings of the second channel connecting ends 314b of all the second channels 314 on the target mounting disc 310 converge at the center of the target mounting disc 310.

[0046] Reference Figures 11 to 12 This is a specific embodiment of the target disc assembly 100 of the utility model. The target disc assembly 100 is composed of a target backing plate 110 and an active layer 120. The target backing plate 110 is internally provided with a cooling channel, and the inlet and outlet of the cooling channel correspond to the first cooling hole 111 and the second cooling hole 112 on the target backing plate, that is, when the cooling liquid is injected from the first cooling hole 111, it will flow out from the second cooling hole 112, or when the cooling liquid is injected from the second cooling hole 112, it will flow out from the first cooling hole 111. The target backing plate is also provided with a positioning hole 113 for positioning during installation and a fixing hole 114 for fixing the target disc assembly 100. The target backing plate 100 is also provided with a positioning portion 115 for positioning during installation with the adjacent target backing plate 100.

[0047] Reference Figures 5 to 12When the target disk assembly 100 is mounted to the target mounting disk 310, the positioning hole 113 on the target disk assembly 100 corresponds to the target positioning hole 315 on the target mounting disk 310; the first cooling hole 111 on the target disk assembly 100 corresponds to the first channel target end 313a on the target mounting disk 310; the second cooling hole 112 on the target disk assembly 100 corresponds to the second channel target end 314a on the target mounting disk 310; the fixing hole 114 on the target disk assembly 100 corresponds to the target fixing hole 316 on the target mounting disk 310. The target disk assembly 100 is fixed to the target fixing hole 316 through a screw (not shown in the figure) passing through the fixing hole 114. Optionally, the target positioning hole 315 is 1 or 2; the target fixing hole 316 is at least 2. The first cooling hole 111 and the second cooling hole 112 on the target disk assembly 100 are at least 1. The number of the first channel 313 and the second channel 314 on the target mounting disk 310 is consistent with the number of the first cooling hole 111 and the second cooling hole 112, respectively.

[0048] Reference Figures 4 to 10The target disk rotating shaft 320 is further provided with a cooling liquid conducting pipe 340 inside. The cooling liquid conducting pipe 340 is hollow and tubular, and the outer diameter of the cooling liquid conducting pipe 340 is smaller than the inner diameter of the target disk rotating shaft 320. The cooling liquid conducting pipe 340 has a conducting pipe flange end 341 corresponding to the rotating shaft flange end 321 and a conducting pipe connecting end 342 corresponding to the rotating shaft connecting end 323. The cooling liquid conducting pipe 340 divides the inside of the target disk rotating shaft 320 into two spaces. The first space is formed by the inner wall of the target disk rotating shaft 320 and the outer wall of the cooling liquid conducting pipe 340, and the second space is the inside of the cooling liquid conducting pipe 340. All the first channel connecting ends 313b on the target material mounting disk 310 converge and communicate to the first space formed by the inner wall of the target disk rotating shaft 320 and the outer wall of the cooling liquid conducting pipe 340. All the second channel connecting ends 314b on the target material mounting disk 310 converge and communicate to the second space formed by the inside of the cooling liquid conducting pipe 340. The rotating shaft connecting end 323 of the target disk rotating shaft 320 is connected to a rotary joint 350, the first space formed by the inner wall of the target disk rotating shaft 320 and the outer wall of the cooling liquid conducting pipe 340 communicates to a first pipe 351 fixedly connected to the rotary joint 350, and the second space formed by the inside of the cooling liquid conducting pipe 340 communicates to a second pipe 352 fixedly connected to the rotary joint 350. Through the above ingenious connection, the first pipe 351 finally communicates to the first cooling hole 111 on the target disk assembly, and the second pipe 352 finally communicates to the second cooling hole 112 on the target disk assembly. The function of cooling each target disk assembly 100 during the rotation of the target material mounting disk 310 and the target disk assembly 100 is realized. The cooling channels of the plurality of target disk assemblies 100 fixedly connected to the target material mounting disk 310 are in parallel. When cooling liquid is injected through the first pipe 351, the cooling liquid sequentially passes through the first space formed by the inner wall of the target disk rotating shaft 320 and the outer wall of the cooling liquid conducting pipe 340, the first channel connecting end 313b, the first channel 313, the first channel target material end 313a, the first cooling hole 111, the cooling channel inside the target material back plate (not shown in the figure), the second cooling hole 112, the second channel target material end 314a, the second channel 314, the second channel 314b, the second space formed by the inside of the cooling liquid conducting pipe 340, and finally flows out through the second pipe 352. When cooling liquid is injected through the second pipe 352, the cooling liquid flows in the opposite order, and finally flows out through the first pipe 351 after cooling the target disk assembly 100. Either the first pipe 351 or the second pipe 352 can be connected to the cooling liquid supply port of the cooling device, and the other one is connected to the return port.

[0049] Reference Figures 1 to 4The first transmission element 360 is fixed on the power transmission part 322 of the target disc rotating shaft. The power assembly 400 is connected to the target box assembly 200, and the power element 410 of the power assembly 400 is fixed to the box body 210 in the target box assembly 200 through the power element mounting seat 420. The output end of the power element 410 is fixed with the second transmission element 430, and the second transmission element 430 and the first transmission element 360 are matched to realize motion transmission. When the output end of the power element 410 outputs rotary motion, the second power element 430 cooperates with the first transmission element 360 to drive the target disc rotating shaft 320 to drive the target material mounting disc 310 and the target disc assembly 100 fixed to the target material mounting disc 310 to realize rotary motion.

[0050] In the embodiment, the box body 210 and the box cover 220 of the target box assembly 200, and the box cover 220 and the mounting cover 230 are all provided with related sealing elements. The rotary sealing assembly 330 and the flange assembly 500 are both provided with sealing elements between the box body 210. The flange assembly 500 further includes a particle beam bombardment channel 510 and a particle beam monitoring channel 520. The particle beam bombardment channel 510 is used to provide a motion channel for the particle beam generated by the upstream particle beam generating device, and the particle beam directly bombards the action layer 120 on the target disc assembly 100 after passing through the particle beam bombardment channel 510. The particle beam monitoring channel 520 is used to monitor the state of the particle beam passing through the particle beam bombardment channel 510, so as to adjust the particle beam generating device to generate a more ideal particle beam.

[0051] In the embodiment, six target disc assemblies 100 are fixed on the target material mounting disc 310 to form a continuous annular neutron target. In other embodiments, any integer between 2 and 20 can be used. For example, eight target disc assemblies 100 can be fixed to form an annular neutron target, or twelve target disc assemblies 100 can be fixed to form an annular neutron target, etc. Related technical personnel can easily realize it by referring to the structure of the utility model and changing the related structure of the target material mounting disc 310.

[0052] It should be understood that the above description is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A target disk rotating BNCT neutron target system, characterized by The BNCT neutron target system comprises: a plurality of target disc assemblies, each of which comprises a target backing plate and an active layer; a target disc rotating assembly, which comprises a target mounting disc, a hollow target rotating shaft and a rotating sealing assembly, wherein the target mounting disc is used to annularly fix the plurality of target disc assemblies in the circumferential direction thereof, and the target rotating shaft is fixed to the middle part of the target mounting disc; a target box assembly, which comprises a box body and a box cover, the target mounting disc and the target disc assemblies are located inside the box body, a part of the target rotating shaft is located inside the box body and a part of the target rotating shaft extends to the outside of the box body, and the target rotating shaft is sealed from the box body by the rotating sealing assembly; a power assembly and a flange assembly, the power assembly is used to drive the target rotating shaft to rotate the target disc assemblies, one end of the flange assembly is fixed to the box body and the other end of the flange assembly is connected to a particle generating device, wherein the box body is further provided with a working hole in communication with the flange assembly, and the projection of the working hole on the target disc assembly is located on the active layer of the target disc assembly.

2. The target spin type BNCT neutron target system according to claim 1, characterized in that: The thickness of the active layer in the target disc assembly is 20-300 μm.

3. The target spin type BNCT neutron target system according to claim 1, characterized in that: The number of the target disc assemblies is 2-20, and the active layer material is formed into a complete annular shape after splicing.

4. The target spin type BNCT neutron target system of claim 1, wherein: The target disc assembly further comprises a hydrogen storage layer between the target backing plate and the active layer, and the thickness of the hydrogen storage layer is 10-100 μm.

5. The target spin type BNCT neutron target system of claim 1, wherein: The target backing plate is provided with a channel for the flow of cooling liquid.

6. The target spin type BNCT neutron target system of claim 1, wherein: The hollow target rotating shaft is further provided with a hollow cooling liquid conducting pipe coaxial with the target rotating shaft; the inner wall of the target rotating shaft and the outer wall of the cooling liquid conducting pipe form a channel for the cooling liquid to enter and flow out of the target disc assembly.

7. The target wheel rotating BNCT neutron target system of claim 1, wherein: The target mounting disc is provided with a plurality of channels for the cooling liquid to enter or flow out of the target disc assembly, which correspond to the cooling holes in the target disc assembly.

8. The target wheel rotating BNCT neutron target system of claim 1, wherein: The box cover of the target box assembly is provided with a target mounting hole and a mounting cover for closing the target mounting hole.

9. The target wheel rotating BNCT neutron target system of claim 1, wherein: The power assembly comprises a power element, a power element mounting seat and a transmission element.

10. The target wheel rotating BNCT neutron target system of claim 1, wherein: The flange assembly comprises a particle beam bombardment channel and a particle beam monitoring channel.

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