Self-shielding neutron target device and self-shielding neutron target system

Abstract

The utility model discloses a self-shielding neutron target device and a self-shielding neutron target system, the self-shielding neutron target device comprises a neutron target and a shielding housing, the neutron target comprises a target disc and a rotating part, the target disc is connected with the rotating part, the shielding housing is provided with a shielding chamber and a channel, the shielding chamber is used for packaging the target disc, and the rotating part passes through the channel. The shielding shell is further provided with a connecting end and an emitting end, the connecting end faces at least one part of the target disc, and the emitting end and the connecting end are located on the two opposite sides of the target disc. The shielding cavity can effectively package the target disc, generated neutrons and other radiation are limited in the shielding cavity, radiation leakage is avoided, the neutron target equipment is protected, operators can be prevented from being hurt by radiation, a channel for the rotating part to penetrate out is reserved in the shielding shell, and movement of the rotating part cannot be hindered while the sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of neutron sources, in particular to a self-shielding neutron target device and a self-shielding neutron target system. Background Art

[0002] Neutron targets, as the physical foundation of neutron sources, have a crucial impact on neutron yield and energy spectrum. Currently, most neutron targets are stationary. Heat generated by the proton beam is concentrated at the irradiation center, leading to heat concentration in the target material, which undoubtedly reduces the target's operating life. Furthermore, when using protons with energies below 4 MeV, Li-7 targets are generally used. Li-7 is easily corroded in air. Furthermore, during proton targeting, Li-7 undergoes a (p, n) reaction to produce the radioactive element Be-7. The radiation generated by Be-7 decay exceeds acceptable limits for workers. For example, at a proton flux of 2.8 MeV and 10 mA per day, the radiation dose from Be-7 decay at a distance of 40 cm from the target is 33 mSv / h after 60 days of continuous operation. Furthermore, during target disassembly, there is a risk of radiation leakage, potentially harming workers. Utility Model Content

[0003] The technical problem to be solved by the present utility model is to overcome the defects of the prior art in that the neutron target has concentrated heat during operation, is easily corroded when exposed to the air, and has high radiation intensity during use and is easy to damage the human body, and to provide a self-shielded neutron target device and a self-shielded neutron target system.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A self-shielded neutron target device comprises a neutron target and a shielding shell. The neutron target comprises a target disk and a rotating part. The target disk is connected to the rotating part. The shielding shell has a shielding chamber and a channel. The shielding chamber is used to encapsulate the target disk. The channel is for the rotating part to pass through. The shielding shell is also provided with a connecting end and an output end. The connecting end is arranged toward at least a portion of the target disk. The output end and the connecting end are located on opposite sides of the target disk.

[0006] In this solution, the shielding chamber can effectively encapsulate the target disk, confining the generated neutrons and other radiation inside the shielding chamber to avoid radiation leakage, thereby protecting the neutron target equipment and preventing operators from being harmed by radiation. A channel is reserved on the shielding shell for the rotating part to pass through, which achieves a sealing effect without hindering the movement of the rotating part.

[0007] Preferably, the shielding shell includes a first shell and a second shell, the connection end is provided on the first shell, the emission end is provided on the second shell, and the first shell and the second shell are connected to form a shielding chamber.

[0008] In this solution, the modular design facilitates manufacturing, transportation and assembly, makes maintenance and replacement of parts more convenient, and improves the flexibility and maintainability of the device.

[0009] Preferably, the self-shielded neutron target device further includes a plurality of fasteners, and the first shell and the second shell are both provided with a plurality of connecting holes, which are respectively arranged at intervals along the circumference of the first shell and the second shell, and the connecting holes on the first shell correspond to the connecting holes on the second shell one by one for the fasteners to pass through.

[0010] In this solution, the first shell and the second shell are firmly connected together by fasteners to form a stable shielding chamber, which improves the mechanical strength and stability of the entire device and ensures that the shell will not loosen or separate due to vibration or external force during operation. The design of several fasteners and connecting holes allows the first shell and the second shell to be easily installed and disassembled.

[0011] Preferably, a first cooling channel is provided in the rotating portion, a second cooling channel is provided in the target disk, and the first cooling channel is communicated with the second cooling channel.

[0012] In this solution, the first cooling channel and the second cooling channel are connected to form a continuous cooling system, so that the target disk arranged in the shielding chamber can also transfer heat through the first channel, thereby enhancing the thermal management capability of the self-shielded neutron target device.

[0013] Preferably, the self-shielded neutron target device also includes a rotary joint, which is sleeved on the rotating part and fixed relative to the shielding shell, and there is a gap space between the inner wall of the rotary joint and the outer wall of the rotating part; the rotary joint is provided with a water inlet and a water outlet, and the rotating part is provided with a water inlet through-hole and a water outlet through-hole, and a plurality of water inlet through-holes are provided, and the plurality of water inlet through-holes are arranged at intervals along the circumferential direction of the rotating part and are connected with the water inlet to allow cooling water to enter the first cooling channel; a plurality of water outlet through-holes are provided, and the plurality of water outlet through-holes are arranged at intervals along the circumferential direction of the rotating part and are connected with the water outlet to discharge the cooling water to the outside.

[0014] In this solution, the rotary joint is fixed relative to the shielding housing. The clearance ensures that the rotary joint does not obstruct the rotation of the rotating part. Furthermore, the rotary joint allows for the inflow and outflow of cooling water, allowing it to continuously flow into the first cooling channel, quickly dissipating heat generated during operation and ensuring that the target disc and rotating part operate at an appropriate temperature. Multiple water inlet and outlet holes are spaced circumferentially to form a uniform cooling water flow path.

[0015] Preferably, the self-shielding neutron target further includes a plurality of sealing rings, at least two of which are sleeved on the rotating part and located on opposite sides of the water outlet.

[0016] In this solution, sealing rings are placed on both sides of the water outlet, creating a double seal. On the one hand, they isolate the water outlet from the water inlet, allowing cooling water to flow through the first cooling channel, then into the second cooling channel, and then out, rather than directly out of the water outlet. On the other hand, the sealing ring on the other side of the water outlet prevents cooling water from flowing into other structures or other materials from flowing into the water outlet. This significantly enhances the sealing performance and cooling effect of the self-shielded neutron target device.

[0017] Preferably, the self-shielding assembly further comprises a magnetic fluid sealing device, which is sleeved on the rotating part and fixed relative to the shielding shell. The magnetic fluid sealing device comprises magnetic fluid, which is arranged between the magnetic fluid sealing device and the rotating part.

[0018] In this solution, the magnetic fluid sealing device uses magnetic fluid to form a strong sealing effect between the rotating part and the sealing device to prevent coolant leakage and external contaminants from entering. The magnetic fluid is used as a sealing medium to reduce the direct contact between the rotating part and the sealing device. The magnetic fluid seal can maintain stable sealing performance in high-speed and high-temperature environments. The sealing ring at the water outlet can separate the cooling water from the magnetic liquid in the magnetic fluid sealing device.

[0019] Preferably, the self-shielded neutron target device further comprises a magnetic levitation motor, which is sleeved on the rotating part with a gap between the magnetic levitation motor and the rotating part, and is fixed relative to the shielding shell; the rotating part is coaxial with the target disk, and the magnetic levitation motor comprises a rotor, which is connected to the rotating part to drive the rotating part to rotate.

[0020] In this solution, a magnetic levitation motor is used to drive the rotating part to rotate. The magnetic levitation motor is fixed relative to the shielding shell and a gap is provided between the magnetic levitation motor and the rotating part so that the rotation of the rotating part is not hindered. The magnetic levitation motor is energized to generate a magnetic field, which guides the rotor fixed on the rotating part to drive the rotating part to rotate, thereby causing the target disk to rotate, reducing contact friction. The magnetic levitation motor controls the rotation speed and position of the rotating part through magnetic force.

[0021] Preferably, the self-shielding neutron target device comprises a rotary joint, a magnetic sealing device and a magnetic levitation motor, the magnetic sealing device is flange-connected to the rotary joint and the magnetic levitation motor respectively, and the magnetic levitation motor is flange-connected to the shielding shell.

[0022] In this solution, the magnetic sealing device is respectively connected to the rotary joint and the magnetic levitation motor flange, and a magnetic liquid ring is formed to isolate the low vacuum environment of the front rotary joint and the high vacuum environment behind the rear magnetic levitation motor, forming a continuous sealing system and a stable connection relationship.

[0023] A self-shielded neutron target system comprises the self-shielded neutron target device as described above. The self-shielded neutron target system further comprises a packaging component, which is covered on the connecting end and the output end to seal the shielding chamber.

[0024] In this solution, the package covers the connection end and the output end, and can provide additional sealing protection when the neutron target device is in a non-working state and the connection end and the output end are open, preventing external contaminants from entering and internal substances from leaking, supplementing the shielding effect of the shielding shell, protecting both the target disk and the operator from radiation hazards.

[0025] Preferably, the package is provided with at least two grooves and at least two blocking parts, the emission end is provided with a first extension part, and the connecting end is provided with a second extension part, the first extension part and the second extension part respectively extend into the grooves adjacent thereto, and the blocking part abuts against the first extension part and the second extension part respectively to limit the displacement of the package relative to the emission end and the connecting end; wherein the blocking part is set to an elastic material.

[0026] In this solution, the cooperation between the groove and the blocking part effectively limits the displacement of the package relative to the output end and the connection end. The blocking part is made of elastic material, and the elastic blocking part allows displacement and deformation within a certain range. Through deformation, the first extension part and the second extension part can enter the groove to form close contact.

[0027] The positive progress effect of this utility model is:

[0028] The shielding chamber can effectively encapsulate the target disk, confining the generated neutrons and other radiation inside the shielding chamber to avoid radiation leakage, thereby protecting the neutron target equipment and preventing operators from being harmed by radiation. A channel is reserved on the shielding shell for the rotating part to pass through, which achieves a sealing effect without hindering the movement of the rotating part. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A side-view cross-sectional view of a self-shielding neutron target device in one embodiment of the present invention;

[0030] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0031] Figure 3 This is a partial cross-sectional view of a self-shielding neutron target device in an embodiment of the present invention;

[0032] Figure 4 This is a partial structural diagram of a self-shielding neutron target in one embodiment of the present invention;

[0033] Figure 5 for Figure 4 Schematic diagram of the internal structure from another angle.

[0034] Description of reference numerals:

[0035] 100 self-shielded neutron target device

[0036] 110 neutron target

[0037] 111 Target Plate

[0038] 112 shaft

[0039] 1121 water inlet hole

[0040] 1122 water outlet hole

[0041] 120 rotary joint

[0042] 121 water inlet

[0043] 122 water outlet

[0044] 130 magnetic fluid sealing device

[0045] 140 magnetic levitation motor;

[0046] 141 magnetic induction rotor

[0047] 160 shielding shell

[0048] 161 First Shell

[0049] 1611 connector

[0050] 1612 first extension

[0051] 162 Second housing (output end sealing disk)

[0052] 1621 connection hole

[0053] 1622 output port (neutron output port)

[0054] 1623 Second Extension

[0055] 163 shielded chamber

[0056] 170 housing and accelerator connection flange

[0057] 180 sealing ring

[0058] 200 proton beam tube

[0059] 300 packages (shielding components)

[0060] 310 groove

[0061] 320 blocking part DETAILED DESCRIPTION

[0062] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0063] like Figure 1-5 As shown, an embodiment of the present invention provides a self-shielding neutron target 110 device 100, which includes a neutron target 110 and a shielding shell. The neutron target 110 includes a target disk 111 and a rotating part. The target disk 111 is connected to the rotating part. The shielding shell has a shielding chamber 163 and a channel. The shielding chamber 163 is used to encapsulate the target disk 111, and the channel is for the rotating part to pass through. The shielding shell is further provided with a connecting end 1611 and an output end 1622. The connecting end 1611 is arranged toward at least a portion of the target disk 111, and the output end 1622 and the connecting end 1611 are located on opposite sides of the target disk 111.

[0064] The shielding chamber 163 can effectively encapsulate the target disk 111, confining the generated neutrons and other radiation inside the shielding chamber 163 to avoid radiation leakage, thereby protecting the neutron target 110 equipment and preventing operators from being harmed by radiation. A channel is reserved on the shielding shell for the rotating part to pass through, which achieves a sealing effect without hindering the movement of the rotating part.

[0065] like Figure 1 As shown, the shielding housing includes a first housing 161 and a second housing 162. A connection end 1611 is provided on the first housing 161, and an emission end 1622 is provided on the second housing 162. The first housing 161 and the second housing 162 are connected to form a shielding chamber 163. The modular design of the shielding housing facilitates manufacturing, transportation, and assembly, making maintenance and component replacement more convenient, and improving the flexibility and maintainability of the device.

[0066] In this embodiment, the first shell 161 is flange-connected to the second shell 162 to form a stable shielding chamber 163, thereby improving the mechanical strength and stability of the entire device. The first shell 161 and the second shell 162 are both provided with a plurality of connecting holes 1621, which are arranged at circumferential intervals along the first shell 161 and the second shell 162, respectively. The connecting holes 1621 on the first shell 161 and the second shell 162 correspond one-to-one to each other for fasteners to pass through, thereby ensuring that the shell will not loosen or separate due to vibration or external force during operation. The design of the plurality of fasteners and connecting holes 1621 enables the first shell 161 and the second shell 162 to be easily installed and disassembled.

[0067] like Figure 1 and Figure 2As shown, in this embodiment, the rotating portion is a rotating shaft 112 connected to the target disk 111, and the rotating shaft 112 and the target disk 111 are integrally formed. A first cooling channel is provided in the rotating portion, and a second cooling channel is provided in the target disk 111. The first cooling channel and the second cooling channel are connected to form a continuous cooling system, so that the target disk 111 arranged in the shielding chamber 163 can also achieve heat transfer through the first channel, thereby enhancing the thermal management capability of the self-shielding neutron target 110 device 100.

[0068] Furthermore, the self-shielding neutron target 110 device 100 also includes a rotary joint 120, which is sleeved on the rotating part and fixed relative to the shielding shell, and there is a gap space between the inner wall of the rotary joint 120 and the outer wall of the rotating part; the rotary joint 120 is provided with a water inlet and a water outlet, and the rotating part is provided with a water inlet through-hole 1121 and a water outlet through-hole 1122, and the water inlet through-hole 1121 is provided in plurality, and the plurality of water inlet through-holes 1121 are arranged at intervals along the circumferential direction of the rotating part and are connected with the water inlet to introduce cooling water into the first cooling channel; the water outlet through-hole 1122 is provided in plurality, and the plurality of water outlet through-holes 1122 are arranged at intervals along the circumferential direction of the rotating part and are connected with the water outlet to discharge the cooling water to the outside. When the rotating shaft 112 rotates, the rotating joint 120 remains relatively fixed, enabling the input and output of cooling water through the water inlet and outlet, achieving a cooling water circulation. This allows cooling water to continuously flow into the first cooling channel, quickly removing heat generated during operation and ensuring that the target plate 111 and the rotating part operate at an appropriate temperature. Multiple water inlet holes 1121 and water outlet holes 1122 are spaced apart along the circumference to form a uniform cooling water flow path.

[0069] like Figure 1 As shown, the self-shielding assembly further includes a magnetic fluid seal 130, which is sleeved around the rotating portion and fixed relative to the shielding housing. The magnetic fluid seal 130 includes a magnetic fluid disposed between the magnetic fluid seal 130 and the rotating portion. The magnetic fluid seal 130 utilizes the magnetic fluid to create a strong seal between the rotating portion and the seal, preventing coolant leakage and the ingress of external contaminants. The magnetic fluid, acting as a sealing medium, reduces direct contact between the rotating portion and the seal. The magnetic fluid seal is capable of maintaining stable sealing performance in high-speed and high-temperature environments. A sealing ring 180 at the water outlet separates the cooling water from the magnetic fluid in the magnetic fluid seal 130.

[0070] The self-shielded neutron target 110 device 100 further includes a magnetic levitation motor 140, which is mounted on a rotating portion with a gap between the rotating portion and the rotating portion. The magnetic levitation motor 140 is fixed relative to the shielding housing. The rotating portion is coaxial with the target disk 111. The magnetic levitation motor 140 includes a rotor, which is connected to the rotating portion to drive the rotating portion to rotate. The magnetic levitation motor 140 is used to drive the rotating portion to rotate. The magnetic levitation motor 140 is fixed relative to the shielding housing with a gap between the rotating portion and the rotating portion to ensure unimpeded rotation of the rotating portion. When the magnetic levitation motor 140 is energized, it generates a magnetic field, which guides the rotor fixed to the rotating portion to rotate the rotating portion, thereby rotating the target disk 111 and reducing contact friction. The magnetic levitation motor 140 controls the rotational speed and position of the rotating portion through magnetic force.

[0071] The magnetic seal device is flange-connected to the rotary joint 120 and the magnetic levitation motor 140, and the magnetic levitation motor 140 is flange-connected to the shielding housing. The self-shielded neutron target 110 also includes multiple sealing rings 180, at least two of which are mounted on the rotating portion and located on opposite sides of the water outlet.

[0072] like Figure 1-2 As shown, in this embodiment, the magnetic sealing device, rotary joint 120, and magnetic levitation motor 140 are flange-connected. A magnetic liquid ring is formed to isolate the low vacuum environment of the front rotary joint 120 from the high vacuum environment behind the rear magnetic levitation motor 140, forming a continuous sealing system and a stable connection. The sealing ring 180 is configured as an O-ring 180. The O-ring 180 is mounted on the rotating shaft 112 and is provided between the water inlet and the water outlet to serve as a barrier. The O-ring 180 is provided near the flange of the rotary joint 120 connected to the magnetic fluid sealing device 130 to separate the cooling medium from the magnetic fluid in the magnetic fluid sealing device 130. Sealing rings 180 are positioned on either side of the water outlet, creating a double seal. On the one hand, they isolate the water outlet from the water inlet, allowing cooling water to flow through the first cooling channel and then into the second cooling channel before exiting, rather than directly through the water outlet. On the other hand, the sealing ring 180 on the other side of the water outlet also prevents cooling water from flowing into other structures or other materials from flowing into the water outlet. This significantly enhances the sealing performance and cooling effect of the self-shielded neutron target 110 device 100.

[0073] The present invention further provides a self-shielding neutron target 110 system based on the self-shielding neutron target 110 device 100, which includes the self-shielding neutron target 110 device 100 as described above. The self-shielding neutron target 110 system also includes a package 300, which is covered on the connecting end 1611 and the output end 1622 to seal the shielding chamber 163.

[0074] The package 300 covers the connection end 1611 and the output end 1622, and can provide additional sealing protection when the neutron target 110 device is in a non-operating state and the connection end 1611 and the output end 1622 are open, preventing external contaminants from entering and internal substances from leaking, supplementing the shielding effect of the shielding shell, protecting both the target disk 111 and the operator from radiation hazards.

[0075] like Figure 4-5 As shown, the package 300 is provided with at least two grooves 310 and at least two blocking portions 320. The emission end 1622 is provided with a first extension portion 1612, and the connection end 1611 is provided with a second extension portion 1623. The first extension portion 1612 and the second extension portion 1623 respectively extend into the adjacent grooves 310, and the blocking portions 320 abut against the first extension portion 1612 and the second extension portion 1623 to limit the displacement of the package 300 relative to the emission end 1622 and the connection end 1611. The blocking portions 320 are made of an elastic material. The cooperation between the grooves 310 and the blocking portions 320 effectively limits the displacement of the package 300 relative to the emission end 1622 and the connection end 1611. The blocking portions 320 are made of an elastic material and allow for displacement and deformation within a certain range. The deformation of the blocking portions 320 allows the first extension portion 1612 and the second extension portion 1623 to enter the grooves 310, forming a close contact.

[0076] In this embodiment, the self-shielded neutron target 110 system also includes a proton beam tube 200. A housing-to-accelerator connection flange 170 is provided at the connection end 1611 of the first housing, which connects to the proton beam tube 200. This allows the neutron target 110 system to communicate with a proton accelerator (not shown), ensuring that the neutron target 110 and proton beam are in a vacuum environment during operation. A flange is also provided in the middle to connect to the front-end magnetic levitation motor 140.

[0077] The first housing 161 is used to shield the radiation generated by the activation of the neutron target 110. Its thickness is determined through radiation-related calculations. The entire system also includes a large shielding structure for radiation protection (not shown). Furthermore, the housing is provided with a housing-to-accelerator connection flange 170, which connects to the proton beam tube 200. This allows the neutron target 110 system to communicate with the proton accelerator (not shown), ensuring that the neutron target 110 and proton beam are in a vacuum environment during operation.

[0078] The shielding shells jointly encapsulate the neutron target disk 111. An output end 1622, i.e., a neutron output port, is provided at a position corresponding to the proton beam tube 200. The second shell 162 is a sealing disk, and the thickness of the sealing disk is also given by radiation-related calculations. A large shielding structure is also provided at the rear end of the system (not shown in the figure).

[0079] refer to Figure 1 、 Figure 5 As shown, when disassembling the neutron target 110, the connecting flanges between the magnetic levitation motor 140 and the first housing 161 (i.e., the self-shielding housing) and the proton beam tube 200 and the housing-accelerator connecting flange 170 are disconnected. The neutron target 110, first housing 161, and second housing 162 are then removed. The encapsulation member 300 (a shielding component) is then fitted with the grooves 310 aligned with the housing-accelerator connecting flange 170 and the flange of the neutron exit port to seal the neutron target 110. The rotary joint 120 is connected to an external water pipe to provide cooling water. Two O-rings are located inside the rotary joint 120, separating the water inlet and outlet from the rotary joint 120 and the magnetic fluid sealing device 130. The water inlet and outlet are aligned with the water inlet holes 1121 and water outlet holes 1122 on the rotating shaft 112, allowing cooling water to circulate throughout the neutron target 110. The magnetic fluid seal 130 uses a magnetic fluid ring to separate the low vacuum environment at the front from the high vacuum environment at the rear. Bearings are internally installed to enable rotation. A magnetic levitation motor 140 drives the neutron target 110. The housing and accelerator connection flange 170 are directly connected to the accelerator via the proton beam tube 200, ensuring a complete vacuum environment during operation. An O-ring 180 is also used to separate the rotary joint 120 and the magnetic fluid seal 130, which in turn separates the low vacuum environment from the high vacuum environment. Furthermore, during operation, a large shielding device is installed outside the neutron target 110 system to prevent radiation leakage. The self-shielding housing, the exit end 1622 sealing disk, and other shielding components ensure that radiation generated by the activation of the neutron target 110 is not leaked when the neutron target 110 is disassembled. Thus, the entire neutron target 110 system achieves the three requirements of rotational heat dissipation, vacuum environment, and radiation shielding.

[0080] Furthermore, when disassembling the neutron target 110, the neutron target 110, first housing 161, and second housing 162 are disassembled as a whole. When removing the neutron target 110, the shielding member's groove 310 is aligned with the flanges at the connection end 1611 (the flange connecting the housing and the accelerator 170) and the output end 1622 (the neutron output port) to seal the target disk 111. The flange connecting the first housing 161 to the magnetic levitation motor 140 does not need to be sealed.

[0081] like Figure 1 、 Figure 2As shown, in this example, the proton energy is 2.8 MeV, the proton beam current is 10 mA, and the proton beam diameter is 10 cm. Calculations show that when the shielding material is lead, a safe shielding thickness of 7.5 cm is sufficient. The target disk 111 has a diameter of 1.02 m, the outer diameter of the annular lithium sheet is 1 m, and the inner diameter is 80 cm. The diameter of the neutron target 110's rotating shaft 112 is 8 cm, and the rotation speed is 1000 rpm. The rotary joint 120, magnetic fluid seal 130, magnetic levitation motor 140, and magnetic induction rotor 141 are all designed based on these conditions. The neutron target 110 system is 1 m long, and the diameter of the shielding shell and the exit end 1622 sealing disk is 1.2 m. In other embodiments, the length, material, and diameter of the components can be adjusted based on the specific radiation intensity and other calculations, and are not limited to the above data.

[0082] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A self-shielded neutron target device, characterized in that: It includes a neutron target and a shielding shell. The neutron target includes a target disk and a rotating part. The target disk is connected to the rotating part. The shielding shell has a shielding chamber and a channel. The shielding chamber is used to encapsulate the target disk. The channel is for the rotating part to pass through. The shielding shell is also provided with a connecting end and an output end. The connecting end is arranged toward at least a portion of the target disk. The output end and the connecting end are located on opposite sides of the target disk.

2. The self-shielded neutron target device according to claim 1, characterized in that: The shielding shell includes a first shell and a second shell. The connecting end is arranged on the first shell, and the emitting end is arranged on the second shell. The first shell and the second shell are connected to form the shielding chamber.

3. The self-shielded neutron target device according to claim 2, characterized in that: The self-shielded neutron target device further includes a plurality of fasteners. The first shell and the second shell are both provided with a plurality of connection holes, which are arranged at intervals along the circumference of the first shell and the second shell, respectively. The connection holes on the first shell correspond to the connection holes on the second shell one by one, for the fasteners to pass through.

4. The self-shielded neutron target device according to claim 1, wherein: A first cooling channel is provided in the rotating part, a second cooling channel is provided in the target disk, and the first cooling channel is communicated with the second cooling channel.

5. The self-shielded neutron target device according to claim 4, characterized in that: The self-shielding neutron target device further includes a rotary joint, the rotary joint being sleeved on the rotating part and fixed relative to the shielding shell, and a gap space being formed between the inner wall of the rotary joint and the outer wall of the rotating part; The rotary joint is provided with a water inlet and a water outlet, and the rotating part is provided with a water inlet through-hole and a water outlet through-hole. The water inlet through-hole is provided in plurality, and the plurality of water inlet through-holes are arranged at intervals along the circumferential direction of the rotating part and are connected with the water inlet to allow cooling water to flow into the first cooling channel; The water outlet through holes are provided in plurality, and the plurality of water outlet through holes are arranged at intervals along the circumferential direction of the rotating part and are connected with the water outlet to discharge the cooling water to the outside.

6. The self-shielded neutron target device according to claim 5, characterized in that: The self-shielding neutron target further includes a plurality of sealing rings, At least two sealing rings are sleeved on the rotating part and are respectively located on two opposite sides of the water outlet.

7. The self-shielded neutron target device according to claim 1, wherein: The self-shielding neutron target device further includes a magnetic fluid sealing device, which is sleeved on the rotating part and fixed relative to the shielding shell. The magnetic fluid sealing device includes magnetic fluid, which is arranged between the magnetic fluid sealing device and the rotating part.

8. The self-shielded neutron target device according to claim 1, wherein: The self-shielded neutron target device further includes a magnetic levitation motor, which is sleeved on the rotating part with a gap between the magnetic levitation motor and the rotating part, and is fixed relative to the shielding shell; The rotating part is coaxial with the target plate, and the magnetic levitation motor includes a rotor. The rotor is connected to the rotating part to drive the rotating part to rotate.

9. The self-shielded neutron target device according to claim 1, wherein: The self-shielding neutron target device comprises a rotary joint, a magnetic sealing device and a magnetic levitation motor. The magnetic sealing device is flange-connected to the rotary joint and the magnetic levitation motor respectively, and the magnetic levitation motor is flange-connected to the shielding shell.

10. A self-shielded neutron target system, characterized in that: It comprises the self-shielding neutron target device according to any one of claims 1 to 9, wherein the self-shielding neutron target system further comprises a packaging component, which is covered on the connecting end and the output end to seal the shielding chamber.

11. The self-shielded neutron target system according to claim 10, wherein: The package is provided with at least two grooves and at least two blocking portions, the emission end is provided with a first extension portion, and the connection end is provided with a second extension portion, the first extension portion and the second extension portion respectively extend into the adjacent grooves, and the blocking portions respectively abut against the first extension portion and the second extension portion to limit the displacement of the package relative to the emission end and the connection end; Wherein, the blocking portion is configured to be made of elastic material.

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