Target capsule for ease of encapsulation and method of encapsulation thereof

Abstract

The present application relates to the technical field of isotope production equipment, and particularly relates to a target capsule convenient to package and a packaging method thereof. The target capsule comprises: a support frame arranged in an annular structure with a through hole in the middle; a target material installed in the through hole, used for receiving bombardment of high-energy particles to generate isotopes; a first shell covered on one side of the support frame; and a second shell covered on the other side of the support frame; wherein a groove extending along the circumferential direction is arranged on the outer peripheral wall of the support frame, and the side wall of the first shell and the side wall of the second shell both extend to the groove opening of the groove and are welded to each other. In the present application, the groove is arranged on the outer peripheral wall of the support frame, and the first shell and the second shell are welded at the groove, so that welding between different materials can be avoided, and the welding position is transferred from the end face to the outer peripheral face, the probability of brittle failure of the welding seam is reduced, and the reliability of the target capsule is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of isotope production equipment technology, and in particular to a target capsule that is easy to encapsulate and its encapsulation method. Background Technology

[0002] Isotopes are widely used in medicine, industry, and scientific research. In the production of isotopes, the target material needs to withstand bombardment by high-energy particles to trigger nuclear reactions that generate isotopes. With the continuous development of technology that uses particle accelerators to irradiate targets for large-scale isotope production, the requirements for the safety and reliability of the targets are becoming increasingly stringent. When particle accelerators irradiate targets, the targets generate heat, thus requiring cooling. Currently, the commonly used cooling method is to place the target in a cooling medium during irradiation.

[0003] However, placing the target material directly in the cooling medium poses a risk of radioactive contamination. The target material itself contains radioactive substances, and under bombardment by high-energy particle beams, new radioactive substances may be generated. These substances may gradually dissolve into the cooling medium, causing contamination. This contamination is not only difficult to control effectively, but may also spread to various parts of the system through the flow of the cooling medium circulation system, seriously threatening equipment operation and the safety of personnel. Therefore, to avoid direct contact between the target material and the cooling medium, the target material is usually encased in a sealed shell. Thus, during the irradiation of the target material by the particle accelerator, the sealed shell separates the target material from the cooling medium, ensuring good heat exchange while preventing the leakage of generated radionuclides.

[0004] In existing technologies, target capsules used for isotope production typically encapsulate the target material by welding metal films to both ends of a support ring. However, this structure, with its two welded surfaces, presents the following drawbacks: 1. The metal film and support ring are made of different materials with significantly different properties, making the metal film prone to deformation during welding and increasing the welding difficulty. 2. The weld between the support ring and the metal film is prone to failure; strong radiation environments and thermal shocks exacerbate weld embrittlement, leading to damage to the target capsule's sealing structure and increasing the risk of radioactive material leakage. 3. Low efficiency in mass production. Summary of the Invention

[0005] This invention aims to solve the technical problems existing in related technologies. To this end, this invention proposes a target capsule that is easy to encapsulate and its encapsulation method, to solve the problem that the sealing structure of the target capsule is difficult to weld and easily damaged, thus causing leakage of radioactive materials.

[0006] In a first aspect, the present invention provides a target capsule that is easy to encapsulate, comprising:

[0007] A support frame, wherein the support frame is configured as a ring structure with a through opening in the middle;

[0008] A target material is installed inside the through-hole to receive bombardment from high-energy particles to produce isotopes.

[0009] The first housing is disposed on one side of the support frame;

[0010] The second housing covers the other side of the support frame;

[0011] The support frame has a groove extending circumferentially on its outer peripheral wall. The side walls of the first housing and the second housing both extend to the opening of the groove and are welded together.

[0012] According to the present invention, a target capsule that is easy to encapsulate is provided, wherein the support frame includes a first support ring and a second support ring, the first support ring and the second support ring having a first outer peripheral wall, a second outer peripheral wall and a transition surface located between the first outer peripheral wall and the second outer peripheral wall along their own axial direction, and the diameter of the first outer peripheral wall is smaller than the diameter of the second outer peripheral wall.

[0013] The transition surface of the first support ring is disposed opposite to the transition surface of the second support ring, and the first outer peripheral wall of the first support ring and the first outer peripheral wall of the second support ring are spliced ​​along the axial direction of the target material to form the groove.

[0014] According to the present invention, a target capsule that is easy to encapsulate is provided, wherein the first shell is configured as a cap-like structure with a cavity on one side, and the depth of the cavity of the first shell is not less than the thickness of the first support ring.

[0015] The second housing is configured as a cover-like structure with a cavity on one side, and the depth of the cavity in the second housing is not less than the thickness of the second support ring;

[0016] The edge of the concave cavity of the first housing and the edge of the concave cavity of the second housing are connected at the opening of the groove.

[0017] According to the present invention, a target capsule that is easy to encapsulate is provided, wherein the support frame further includes a positioning ring with the through-hole as an annular hole, and the first support ring and the second support ring are both sleeved on the outer periphery of the positioning ring.

[0018] According to the present invention, a target capsule that is easy to encapsulate is provided in which the inner peripheral walls of the first support ring and the second support ring are both configured as mutually adaptable cylindrical surfaces with the outer peripheral wall of the positioning ring and are fitted with clearance or interference.

[0019] According to the present invention, a target capsule that is easy to encapsulate is provided, wherein the inner peripheral wall of the positioning ring is provided with a protrusion, the protrusion extends radially along the positioning ring, a plurality of the protrusions are distributed circumferentially at intervals along the positioning ring, and the outer peripheral wall of the target material abuts against the protrusion.

[0020] According to the present invention, a target capsule that is easy to encapsulate is provided, wherein the positioning ring is made of a high-temperature resistant material.

[0021] Secondly, the present invention also provides a method for encapsulating a target capsule, applicable to the target capsule that is easy to encapsulate as described in any of the above claims, the encapsulation method comprising:

[0022] S1. Fabricate the first shell, the second shell, the support frame, and the target material based on the dimensions of the target capsule;

[0023] S2. Assemble the target material, support frame, first shell and second shell into a target capsule. Clamp the target capsule by applying extrusion pressure to the first shell and second shell from both ends respectively, and weld the first shell and second shell into one piece.

[0024] S3. Perform a sealing verification test on the target capsule.

[0025] According to a method for encapsulating a target capsule provided by the present invention, the preparation of a first shell, a second shell, a support frame, and a target material based on the dimensions of the target capsule includes:

[0026] The target capsule is defined as a cylindrical structure with a diameter of D1 and a thickness of T, and the target material has a diameter of D2.

[0027] A first shell and a second shell, consisting of a bottom wall and a side wall, are fabricated using a metal film of thickness t. The outer diameter of the bottom wall is D1, and the length of the side wall is T / 2. The diameter of the through-hole of the support frame is D2, and the outer diameter is D1-2t. The thickness of the target material is T-2t.

[0028] According to a method for encapsulating a target capsule provided by the present invention, the sealing verification test of the target capsule includes:

[0029] Place the capsule target in the vacuum chamber, start pumping air and maintain the pump for the preset time;

[0030] Turn off the vacuum pump, fill the vacuum chamber with helium or hydrogen, maintain the pressure, and keep it at the preset time.

[0031] The target capsule is removed from the vacuum chamber, heated, and tested for gas leakage.

[0032] The above-described one or more technical solutions of this invention have at least one of the following technical effects:

[0033] By setting grooves on the outer peripheral wall of the support frame and welding the first and second shells at the grooves, it is possible to avoid welding between different materials, reduce the thermal stress and thermal strain on the weld, and shift the welding position from the end face to the outer peripheral face, thereby reducing the influence of the irradiation environment on the weld and greatly reducing the probability of weld embrittlement failure.

[0034] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or will be learned through the practice of the present invention. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the explosive structure of a target capsule provided in an embodiment of the present invention.

[0037] Figure 2 for Figure 1 A partial sectional view of the central support frame.

[0038] Figure 3 This is a schematic diagram of the explosive structure of another target capsule provided in an embodiment of the present invention.

[0039] Figure 4 for Figure 3 A cross-sectional view of the target capsule along its radial section.

[0040] Figure 5 for Figure 4 Enlarged schematic diagram of partial view A in the middle.

[0041] Figure 6 This is a schematic diagram of the explosive structure of another target capsule provided in an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of a positioning ring provided in an embodiment of the present invention.

[0043] Figure label:

[0044] 10. Support frame; 11. First support ring; 12. Second support ring; 13. Positioning ring; 14. Groove; 15. Protrusion; 20. Target material; 30. First housing; 40. Second housing. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0046] In existing technologies, target capsules used for isotope production typically encapsulate the target material by welding metal films to both sides of a support ring. However, target capsules with this structure have the following drawbacks due to having two welded surfaces:

[0047] The welding process is challenging: deformation is prone to occur during the welding of metal films. When the metal film is heated by an electron beam, laser, or other heat source, an uneven temperature field is generated, leading to thermal expansion and contraction at the edges of the metal film (manifested as the formation of irregular small spheres at the film edges). Furthermore, due to the different materials of the metal film and the support ring, the degree and direction of thermal expansion and contraction on the metal film and the support ring are also different, resulting in uneven thermal stress and strain. When the thermal strain exceeds the elastic limit of the material, plastic deformation occurs, i.e., welding deformation. Ultimately, this leads to defects at the weld position and severe warping of the entire metal film surface.

[0048] The weld between the support ring and the metal film has a high probability of failure: To ensure tight contact between the metal film and the target material and reduce the contact thermal resistance, the target capsule is usually encapsulated in a high-vacuum environment. After welding, the slit cavity inside the target capsule is in a vacuum state. During use, the target capsule is always in a pressurized cooling circulation system, and a force exceeding 1 atm forces the metal film to adhere tightly to the target material. At this time, external pressure can easily cause deformation of the metal film, while the support ring is relatively thick, ultimately causing stress to concentrate in the weld area. On the other hand, strong radiation environments and thermal shocks can cause weld embrittlement, which may eventually lead to weld failure and radioactive material leakage accidents.

[0049] Low efficiency in mass production: During the welding process, a fixture is needed to fix the metal film to resist some welding deformation. After the fixture is removed, additional welding is required at the fixture position. The process is repeated after flipping the film. As a result, when using mechanized welding technology, it is necessary to precisely program the robot's spatial trajectory, as well as to accurately measure and program offline, which takes a long time, results in low welding continuity, and extremely low efficiency in mass production.

[0050] To address the aforementioned challenges, an embodiment of the present invention introduces a target capsule that is easy to encapsulate.

[0051] like Figure 1As shown, the target capsule mainly includes a support frame 10, a target material 20, a first shell 30, and a second shell 40.

[0052] The support frame 10 is configured as an annular structure with a through-hole in the middle. The target material 20 is installed in the through-hole to receive bombardment from high-energy particles to produce isotopes.

[0053] The first housing 30 covers one side of the support frame 10, and the second housing 40 covers the other side of the support frame 10.

[0054] like Figure 2 As shown, the outer peripheral wall of the support frame 10 is provided with a groove 14 extending circumferentially therefrom. The sidewalls of the first housing 30 and the second housing 40 both extend to the opening of the groove 14.

[0055] Furthermore, the sidewalls of the first housing 30 and the second housing 40 are welded together at the opening of the groove 14. In this way, the opening of the groove 14 is exactly inside the welding position, which not only ensures that the back of the weld pool is suspended during the welding process, thus guaranteeing the welding quality at the joint between the first housing 30 and the second housing 40, but also prevents the weld from sticking to the support frame 10, and keeps the welding position away from the target material 20.

[0056] When welding is performed using laser, electron beam, or other welding processes, the heat-affected zone only affects the outer peripheral wall of the support frame 10, thus avoiding problems such as welding deformation, damage to the internal target material 20, or damage to the support structure caused by excessive heat input.

[0057] Furthermore, by welding the first housing 30 and the second housing 40 to the outer periphery of the support frame 10, multiple target capsules of the same specification can be continuously encapsulated by simply setting the rotational angular velocity of the target capsule (i.e., the linear velocity of the welding position is constant) and the fixed position of the welding torch for target capsules of different diameters. Moreover, the welding torch can be adjusted to the optimal position in one go and maintain its posture throughout the welding process, greatly improving the production efficiency of target capsules.

[0058] Furthermore, the first housing 30 and the second housing 40 can adopt the same structure and materials, thereby transforming the original welding relationship between the metal film and the support ring of different materials and different thicknesses into the welding of the same material with equal thickness, so that the weld between the first housing 30 and the second housing 40 is subjected to uniform thermal stress and thermal strain to avoid weld deformation.

[0059] Preferably, the target material 20 can be configured as various types, such as solid foil, solid sheet, powder, or liquid compound.

[0060] The support frame 10 can be made of metallic materials, such as aluminum alloy or stainless steel; it can also be made of non-metallic materials, such as ceramics or graphite. The advantage of ceramics and graphite is their high-temperature resistance, ensuring that most of the target material 20 will not chemically react with them at high temperatures. Even if the target material 20 adheres to the support frame 10, the acid and alkali resistance of ceramics and graphite will not affect the chemical dissolution and isotope separation process of the target material 20.

[0061] The support frame 10 can also be made of a combination of metal and non-metal materials.

[0062] Furthermore, the materials used to manufacture the first shell 30 and the second shell 40 can be copper, titanium, nickel-based alloys, or other materials with good heat resistance and strength, in order to ensure the stability of the target material 20 in a high-temperature environment.

[0063] In this embodiment, by providing a groove 14 on the outer peripheral wall of the support frame 10 and welding the first housing 30 and the second housing 40 at the groove 14, it is possible to avoid welding between different materials, reduce the thermal stress and thermal strain on the weld, and also shift the welding position from the end face to the outer peripheral face, reducing the influence of the irradiation environment on the weld, thus greatly reducing the probability of weld embrittlement failure.

[0064] Based on the above embodiments, another embodiment of the present invention introduces a target capsule that is easy to encapsulate.

[0065] like Figures 3 to 5 As shown, the support frame 10 includes a first support ring 11 and a second support ring 12. The first support ring 11 and the second support ring 12 are respectively provided with two outer peripheral walls of different diameters along their own axial direction and a transition surface located between the two outer peripheral walls.

[0066] Specifically, the first support ring 11 and the second support ring 12 are respectively provided with a first outer peripheral wall, a second outer peripheral wall, and a transition surface located between the first outer peripheral wall and the second outer peripheral wall along their own axial direction. The diameter of the first outer peripheral wall is smaller than the diameter of the second outer peripheral wall.

[0067] The transition surface of the first support ring 11 is disposed opposite to the transition surface of the second support ring 12; and the first outer peripheral wall of the first support ring 11 and the first outer peripheral wall of the second support ring 12 are spliced ​​along the axial direction of the target material 20 to form the groove 14.

[0068] Furthermore, the first housing 30 is configured as a cover-like structure with a cavity on one side. The depth of the cavity in the first housing 30 is not less than the thickness of the first support ring 11.

[0069] The second housing 40 is configured as a cover-like structure with a cavity on one side. The depth of the cavity in the second housing 40 is not less than the thickness of the second support ring 12;

[0070] The edge of the cavity of the first housing 30 and the edge of the cavity of the second housing 40 are connected at the opening of the groove 14.

[0071] like Figure 6 As shown, the support frame 10 further includes a positioning ring 13 with the through opening as an annular hole. The first support ring 11 and the second support ring 12 are both sleeved on the outer periphery of the positioning ring 13. The positioning ring 13 is made of a high-temperature resistant material. Preferably, the positioning ring 13 is made of non-metallic materials such as ceramics or graphite.

[0072] Furthermore, the inner peripheral walls of the first support ring 11 and the second support ring 12 are both configured as mutually adaptable cylindrical surfaces with the outer peripheral wall of the positioning ring 13 and are fitted with clearance or interference fit.

[0073] like Figure 7 As shown, in order to accommodate the gas released by the target 20 during irradiation and to prevent excessive gas from causing the first housing 30, the second housing 40, and the target 20 to separate, thus reducing heat exchange efficiency, a protrusion 15 is provided on the inner peripheral wall of the positioning ring 13, and the protrusion 15 extends radially along the positioning ring 13. The outer peripheral wall of the target 20 abuts against the protrusion 15.

[0074] Several of the protrusions 15 are distributed at intervals along the circumference of the positioning ring 13, dividing the gap between the target material 20 and the positioning ring 13 into multiple arc-shaped air chambers.

[0075] The protrusion 15 can not only serve as a radial positioning point for the target 20, restricting its movement within the annular hole, but also divide the annular gap between the target 20 and the inner wall of the positioning ring 13 into several independent air chambers. This can prevent gas from accumulating in a single area, thus avoiding excessive local pressure and delaying the problem of bulging deformation caused by the rise in internal pressure.

[0076] In another embodiment of the present invention, a method for encapsulating a target capsule is described, which is applied to the target capsule that is easy to encapsulate as described in any of the above embodiments.

[0077] The encapsulation method includes: S1, preparing a first shell 30, a second shell 40, a support frame 10, and a target material 20 based on the size of the target capsule; S2, assembling the target material 20, the support frame 10, the first shell 30, and the second shell 40 into a target capsule, clamping the target capsule by applying extrusion pressure to the first shell 30 and the second shell 40 from both ends respectively, and welding the first shell 30 and the second shell 40 together; S3, performing a sealing verification test on the target capsule.

[0078] Further, the preparation of the first shell 30, the second shell 40, the support frame 10, and the target material 20 based on the size of the target capsule includes: setting the target capsule to be a cylindrical structure with a diameter of D1 and a thickness of T, and the target material 20 to have a diameter of D2; using a metal film with a thickness of t to respectively prepare the first shell 30 and the second shell 40, which are composed of a bottom wall and a side wall, with the outer diameter of the bottom wall being D1 and the length of the side wall being T / 2; setting the through-hole diameter of the support frame 10 to be D2 and the outer circumference diameter to be D1-2t; and setting the thickness of the target material 20 to be T-2t.

[0079] Furthermore, the sealing verification test of the target capsule includes: placing the target capsule in a vacuum chamber, starting evacuation and maintaining it for a preset time; turning off the vacuum pump, filling the vacuum chamber with helium or hydrogen gas and maintaining the pressure for a preset time; removing the target capsule from the vacuum chamber, heating the target capsule, and checking for gas leakage. The preset time can be set as needed. For example, the preset time can be set to 30 minutes.

[0080] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0081] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0082] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0083] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not limited to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A target capsule for ease of encapsulation, characterized in that, The application relates to a target capsule, which comprises the following parts: a support frame (10) arranged in a ring structure with a through hole in the middle; a target material (20) installed in the through hole and used for receiving bombardment of high-energy particles to generate isotopes; a first shell (30) covering one side of the support frame (10); a second shell (40) covering the other side of the support frame (10); wherein a groove (14) extending along the circumference of the support frame (10) is arranged on the outer peripheral wall of the support frame (10), the side wall of the first shell (30) and the side wall of the second shell (40) both extend to the groove mouth of the groove (14) and are welded to each other.

2. The target capsule for ease of packaging of claim 1, wherein, The support frame (10) comprises a first support ring (11) and a second support ring (12), the first support ring (11) and the second support ring (12) respectively have a first outer peripheral wall, a second outer peripheral wall and a transition surface between the first outer peripheral wall and the second outer peripheral wall along the axial direction of the first support ring (11) and the second support ring (12), and the diameter of the first outer peripheral wall is smaller than that of the second outer peripheral wall. The transition surface of the first support ring (11) is oppositely arranged with the transition surface of the second support ring (12), and the first outer peripheral wall of the first support ring (11) and the first outer peripheral wall of the second support ring (12) are spliced along the axial direction of the target material (20) to form the groove (14).

3. The target capsule for ease of packaging of claim 2, wherein, The first shell (30) is arranged in a cover structure with a concave cavity on one side, and the depth of the concave cavity of the first shell (30) is not less than the thickness of the first support ring (11). The second shell (40) is arranged in a cover structure with a concave cavity on one side, and the depth of the concave cavity of the second shell (40) is not less than the thickness of the second support ring (12). The concave cavity edge of the first shell (30) and the concave cavity edge of the second shell (40) are connected at the groove mouth of the groove (14).

4. A target capsule for ease of packaging according to claim 2 or 3, wherein, The support frame (10) further comprises a positioning ring (13) with the through hole as a ring hole, and the first support ring (11) and the second support ring (12) are sleeved on the outer peripheral side of the positioning ring (13).

5. The target capsule for ease of packaging of claim 4, wherein, The inner peripheral wall of the first support ring (11) and the inner peripheral wall of the second support ring (12) are arranged as mutually matched cylindrical surfaces with the outer peripheral wall of the positioning ring (13) and are matched through clearance or interference.

6. The target capsule for ease of packaging of claim 5, wherein, The inner peripheral wall of the positioning ring (13) is provided with a convex part (15) extending along the radial direction of the positioning ring (13), a plurality of convex parts (15) are distributed along the circumferential direction of the positioning ring (13) at intervals, and the outer peripheral wall of the target material (20) abuts against the convex parts (15).

7. The target capsule for ease of packaging of claim 4, wherein, The material of the positioning ring (13) is a high-temperature-resistant material.

8. A method of encapsulating a target capsule, characterized by, The application is applied to the target capsule convenient to package according to any one of claims 1 to 7, and a packaging method comprises the following steps: S1, preparing the first shell (30), the second shell (40), the support frame (10) and the target material (20) based on the size of the target capsule. S2, the target material (20), the support frame (10), the first shell (30) and the second shell (40) are assembled into a target capsule, the target capsule is clamped by applying extrusion pressure to the first shell (30) and the second shell (40) from both ends, and the first shell (30) and the second shell (40) are welded into one body; S3, the target capsule is subjected to a sealing verification test.

9. The method of encapsulating a target capsule according to claim 8, wherein, The first shell (30), the second shell (40), the support frame (10) and the target material (20) are prepared based on the size of the target capsule, including: The target capsule is set to be a cylindrical structure with a diameter D1 and a thickness T, and the target material (20) has a diameter D2; The first shell (30) and the second shell (40) composed of a bottom wall and a side wall are made of a metal film with a thickness t, the outer diameter of the bottom wall is D1, and the length of the side wall is T / 2; the through hole of the support frame (10) has a diameter D2 and an outer peripheral diameter D1-2t; and the thickness of the target material (20) is T-2t.

10. The method of encapsulating a target capsule according to claim 9, wherein, The sealing verification test of the target capsule includes: The capsule target is placed in a vacuum chamber, vacuum pumping is started and maintained for a predetermined time; The vacuum pump is closed, helium or hydrogen is filled into the vacuum chamber to maintain pressure and maintained for a predetermined time; The target capsule is taken out of the vacuum chamber, heated, and detected for gas leakage.

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