Irradiation apparatus for producing iodine-125 by means of reactor irradiation

Abstract

An irradiation apparatus for producing iodine-125 by means of reactor irradiation, comprising: an irradiation cylinder (2), a gas inlet pipe (6), a gas outlet pipe (5), and a protection pipe (11). Two ends of the irradiation cylinder (2) are sealed by a lower connector (1) and an upper cover plate (3), so as to form an irradiation test section; two gas holes are formed in the upper cover plate (3); the gas inlet pipe (6) and the gas outlet pipe (5) are communicated with the interior of the irradiation test section through the two gas holes; a gas outlet of the gas inlet pipe (6) is arranged on the side close to the lower connector (1); and a gas inlet of the gas outlet pipe (5) is arranged on the side close to the upper cover plate (3). The gas inlet pipe (6), the gas outlet pipe (5), and the irradiation cylinder (2) are provided, the irradiation cylinder (2) is placed in an active area of a reactor core, and a target material gas can quickly enter the active area of the reactor core from an inactive area by means of a bottom-in and top-out structure, and is irradiated by neutrons and then discharged from the top of the irradiation apparatus.

Description

An irradiation device for producing iodine-125 by reactor irradiation Technical Field

[0001] The present invention relates to the technical field of isotope preparation, and in particular to an irradiation device for producing iodine-125 by reactor irradiation. Background Art

[0002] Iodine-125 is an important medical radionuclide (T 1 / 2 =59.407d). Due to its long half-life, moderate energy, and minimal radiation damage to human tissue, it is widely used in biomedicine, radioimmunoassays, and brachytherapy for tumors. However, China currently relies entirely on imported raw materials for iodine-125. Therefore, developing new iodine-125 production processes, breaking the foreign monopoly, mastering core key technologies, and achieving domestic production of iodine-125 raw materials have significant scientific and practical significance for promoting the development of the entire nuclear medicine industry chain.

[0003] Leveraging the strengths of our institute's reactors and supporting resources, we conducted extensive thermal experiments and developed a method for producing iodine-125 using a continuous cyclic irradiation process. The process can be summarized as follows: xenon-124 gas is irradiated in a reactor to produce iodine-125, which is then intercepted and adsorbed by an adsorption device. Finally, the adsorption device is replaced to extract the iodine-125 product. The irradiation device is a critical design component in this process, crucial to the quality of the irradiated iodine-125 product produced by the entire system.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present invention is how to irradiate xenon-124 gas. The purpose is to provide an irradiation device for producing iodine-125 by reactor irradiation. The irradiation device solves the problem of target gas circulation in the continuous circulation loop method for producing iodine-125 by irradiation. The active area cavity is designed to the extreme value to maximize the target gas exposure to neutron irradiation. At the same time, the irradiation device also solves the problems of stability and airtightness in the long channel of the reactor.

[0006] The present invention is achieved through the following technical solutions:

[0007] An irradiation device for producing iodine-125 by reactor irradiation, comprising:

[0008] The irradiation tube has two ends sealed by a lower joint and an upper cover to form an irradiation test section, and the upper cover is provided with two air holes;

[0009] an air inlet pipe and an air outlet pipe, which are fixedly connected to the upper cover plate, and the air inlet pipe and the air outlet pipe are connected to the interior of the irradiation test section through the two air holes;

[0010] a protective tube, a first end of which is fixedly connected to the upper cover plate via a support sheet, the other end of which is mounted on the top of the reactor core via a fixing assembly, the inlet pipe and the outlet pipe both being disposed within the protective tube;

[0011] Among them, the air outlet of the air inlet pipe is set on the side close to the lower joint, the air inlet of the air outlet pipe is set on the side close to the upper cover plate, the air inlet of the air inlet pipe passes through the fixed component to weld the air inlet joint, and the air outlet of the air outlet pipe passes through the fixed component to weld the air outlet joint.

[0012] Specifically, the air inlet pipe and the air outlet pipe are symmetrically distributed with the central axis of the upper cover plate as the symmetry axis, the support piece includes a first arc piece and a second arc piece, the first arc piece and the second arc piece are symmetrical arc-shaped, and the outer arc surface radius of the first arc piece and the second arc piece is equal to the inner diameter of the protective tube.

[0013] The air outlet of the air inlet pipe, the first arc-shaped piece, the air inlet of the air outlet pipe and the second arc-shaped piece are sequentially arranged at intervals.

[0014] Specifically, the protective tube is provided with multiple groups of hollow structures, which are distributed in sequence along the axial direction of the protective tube; the hollow structure includes multiple strip-shaped hollow holes, which are evenly distributed in a ring shape along the central axis of the protective tube.

[0015] Furthermore, a shockproof component is provided in the protection tube. The shockproof component is provided between two adjacent hollow structures and is used to fix the protection tube, the air inlet pipe and the air outlet pipe.

[0016] Specifically, the shockproof assembly includes shockproof block A, shockproof block B and shockproof block C;

[0017] The diameter of the shockproof block A is equal to the inner diameter of the protection tube, and the shockproof block A is provided with two through holes A corresponding to the air inlet pipe and the air outlet pipe, and a plurality of water flow holes A for the stack water flow channel;

[0018] The diameter of the shockproof block B is equal to the inner diameter of the protection tube, and the shockproof block B is provided with two through holes B corresponding to the air inlet pipe and the air outlet pipe, and a plurality of water flow holes B for the stack water flow channel;

[0019] The diameter of the shockproof block C is equal to the difference between the inner diameter of the protection tube and the diameter of the air inlet pipe / the air outlet pipe. A plurality of circular grooves are provided on the circumference of the shockproof block C. The radius of the circular grooves is equal to the radius of the air inlet pipe / the air outlet pipe.

[0020] Wherein, both ends of the air inlet pipe and both ends of the air outlet pipe are fixed through the through hole A and / or the circular groove respectively, and the middle part of the air inlet pipe and the middle part of the air outlet pipe are fixed through the through hole B respectively;

[0021] The distance between the central axes of the two through holes B is smaller than the distance between the two through holes A.

[0022] Specifically, the fixing assembly includes a flange assembly and a locking mechanism. The locking mechanism and the protective tube are respectively arranged on both sides of the flange assembly. The protective tube is fixedly connected to the flange assembly. The locking mechanism clamps the air inlet pipe and the air outlet pipe, and the locking mechanism applies a force to the flange assembly toward the irradiation tube.

[0023] Specifically, the flange assembly includes: a flange plate and reinforcing ribs, the other end of the protective tube is fixedly connected to the flange plate and fixed by a plurality of the reinforcing ribs, and the flange plate is provided with through holes for the air inlet pipe and the air outlet pipe to pass through;

[0024] The flange is fixedly connected to the fixed flange on the top of the reactor core by bolts.

[0025] Specifically, the locking mechanism includes: a locking block A and a locking block B, wherein the opposite surfaces of the locking block A and the locking block B are provided with an arc-shaped clamping groove adapted to the air inlet pipe / the air outlet pipe, the locking block A and the locking block B are spliced ​​into a circular hole through the arc-shaped clamping groove and clamp the air inlet pipe / the air outlet pipe, and the locking block A and the locking block B are fixed by screws and apply a clamping force to the air inlet pipe / the air outlet pipe;

[0026] Wherein, the two locking mechanisms clamp the air inlet pipe and the air outlet pipe respectively.

[0027] Optionally, a rubber sleeve is covered between the air inlet pipe / the air outlet pipe and the locking mechanism.

[0028] Optionally, the irradiation tube, the lower joint, the upper cover plate, and the protective tube are all made of 6061 aluminum alloy.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] The present invention provides an air inlet pipe, an air outlet pipe and an irradiation tube structure, places the irradiation tube in the active area of ​​the reactor core, and enables the target gas to quickly enter the active area of ​​the reactor core from the inactive area through a bottom-in and top-out structure. After being irradiated by neutrons, the target gas is discharged from the top of the irradiation device, and the generated iodine-125 is captured by an iodine adsorption device, while the undecayed target gas continues to complete the cyclic irradiation. This process greatly reduces the manual operation process, improves work efficiency, and meets the technical requirements for large-scale continuous cyclic irradiation production of iodine-125. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0032] FIG1 is a schematic structural diagram of an irradiation device for producing iodine-125 by reactor irradiation according to the present invention.

[0033] FIG2 is a cross-sectional view of an irradiation device for producing iodine-125 by reactor irradiation according to the present invention, that is, a cross-sectional view taken along line AA in FIG3a.

[0034] FIG. 3 a is a schematic top view of the central structure of FIG. 1 .

[0035] FIG3 b is a schematic cross-sectional view of BB in FIG1 .

[0036] FIG3 c is a schematic cross-sectional view of CC in FIG1 .

[0037] FIG3 d is a schematic cross-sectional view of DD in FIG1 .

[0038] FIG3e is a schematic cross-sectional view of EE in FIG1 .

[0039] FIG3 f is a schematic cross-sectional view of FF in FIG1 .

[0040] FIG4 is a schematic structural diagram of a protection tube according to the present invention.

[0041] FIG5 a is a schematic structural diagram of the shock-absorbing block A according to the present invention.

[0042] FIG5 b is a schematic structural diagram of the shock-absorbing block B according to the present invention.

[0043] FIG5 c is a schematic structural diagram of the shock-absorbing block C according to the present invention.

[0044] FIG6 is a schematic structural diagram of the lower joint according to the present invention.

[0045] FIG. 7 is a schematic structural diagram of a support sheet according to the present invention.

[0046] FIG8 is a schematic structural diagram of the flange according to the present invention.

[0047] FIG. 9 is a schematic structural diagram of the locking mechanism according to the present invention.

[0048] Figure markings: 1-lower joint, 2-irradiation tube, 3-upper cover, 4-shockproof block A, 5-air outlet pipe, 6-air inlet pipe, 7-shockproof block B, 8-air outlet joint, 9-support plate, 10-shockproof block C, 11-protective tube, 12-flange, 13-reinforcement rib, 14-gasket, 15-bolt, 16-locking mechanism, 17-locking block A, 18-rubber sleeve, 19-locking block B, 20-screw. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the relevant content and are not intended to limit the present invention.

[0050] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0051] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0053] In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] Example 1

[0055] This embodiment realizes continuous circulation irradiation of target gas in the reactor loop device, solves the problem of target gas circulation in the continuous circulation loop method for iodine-125 irradiation production, maximizes the design of the active area cavity to the extreme value, so that more target gas is irradiated by neutrons; at the same time, it also solves the problems of stability and airtightness of the irradiation device in the long channel of the reactor; in addition, the design structure of the device can effectively transfer the heat of the reactor water to the inlet and outlet pipes 5 and the irradiation tube 2, thereby preventing the generated iodine from crystallizing in the lower pipe of the reactor.

[0056] As shown in FIG1 and FIG2 , an irradiation device for producing iodine-125 by reactor irradiation includes: an irradiation tube 2 , an air inlet pipe 6 , an air outlet pipe 5 and a protective tube 11 .

[0057] The two ends of the irradiation tube 2 are sealed by the lower joint 1 and the upper cover plate 3 to form an irradiation test section. The upper cover plate 3 is provided with two air holes. The air inlet pipe 6 and the air outlet pipe 5 are fixedly connected to the upper cover plate 3, and the air inlet pipe 6 and the air outlet pipe 5 are connected to the interior of the irradiation test section through the two air holes. The first end of the protective tube 11 is fixedly connected to the upper cover plate 3 through the support plate 9. The other end of the protective tube 11 is installed on the top of the reactor core through a fixing assembly. The air inlet pipe 6 and the air outlet pipe 5 are both arranged in the protective tube 11.

[0058] Among them, the air outlet of the air inlet pipe 6 is set on the side close to the lower joint 1, the air inlet of the air outlet pipe 5 is set on the side close to the upper cover plate 3, the air inlet of the air inlet pipe 6 passes through the fixed component to weld the air inlet joint, and the air outlet of the air outlet pipe 5 passes through the fixed component to weld the air outlet joint 8.

[0059] The irradiation tube 2 is a cylindrical structure made of aluminum alloy 6061. Both ends of the irradiation tube 2 are open. The irradiation tube 2 will be machined before welding.

[0060] As shown in FIG6 , the lower joint 1 is made of aluminum alloy 6061 and is a solid cylindrical shape. The main functions of the lower joint 1 are to seal the irradiation tube 2 on the one hand and to support the pressure of the entire irradiation device on the other hand to balance and stabilize it.

[0061] A sealing section is formed by the lower joint 1 and the upper cover plate 3 to contain gas target materials for in-pile irradiation testing.

[0062] In practice, the device is set vertically when in use, that is, the air inlet pipe 6 will extend to the vicinity of the bottom of the irradiation tube 2, and the air outlet pipe 5 will be basically flush with the upper cover plate 3, realizing the function of gas inlet and outlet from the bottom. The function of the air inlet pipe 6 and the air outlet pipe 5 is to introduce target gas (xenon-124) into the irradiation test section and discharge the irradiated target gas. After being irradiated by the neutrons in the active area, the target gas is transferred out of the irradiation device from the top of the irradiation tube 2. The generated iodine-125 is intercepted and captured by the iodine adsorption device, and the target gas that has not been irradiated and decayed continues to participate in the loop circulation irradiation.

[0063] As shown in Figure 3b and Figure 7, the air inlet pipe 6 and the air outlet pipe 5 are symmetrically distributed with the central axis of the upper cover plate 3 as the symmetry axis, and the support piece 9 includes a first arc-shaped piece and a second arc-shaped piece. The first arc-shaped piece and the second arc-shaped piece are symmetrical arc-shaped, and the outer arc radius of the first arc-shaped piece and the second arc-shaped piece is equal to the inner diameter of the protective tube 11;

[0064] The air outlet of the air inlet pipe 6, the first arc-shaped piece, the air inlet of the air outlet pipe 5 and the second arc-shaped piece are arranged in sequence and spaced apart.

[0065] The installation position of the protection tube 11 can be determined by the support sheet 9. During installation, the protection tube 11 can be put on the support sheet 9. The support sheet 9 is composed of two arc-shaped aluminum sheets, which can eliminate redundancy and process errors. The protection tube 11 and the irradiation tube 2 are welded together through the support sheet 9 to form two symmetrical rectangular gaps, which are convenient for the entry and exit of reactor water.

[0066] As shown in FIG4 , the protective tube 11 is provided with multiple groups of hollow structures, which are distributed in sequence along the axial direction of the protective tube 11 ; the hollow structures include multiple strip-shaped hollow holes, which are evenly distributed in a ring shape along the central axis of the protective tube 11 .

[0067] The protective tube 11 is made of aluminum alloy, and its length is determined by the height of the reactor core. This ensures that, after the upper end of the protective tube 11 is connected to the top of the reactor core, the irradiation tube is positioned within the reactor's active zone. Multiple strip-shaped hollow holes allow reactor water to enter the protective tube 11, transferring heat to the inlet and outlet pipes 6 and 5.

[0068] As shown in FIG. 1 and FIG. 2 , a shockproof component is further provided in the protection tube 11 . The shockproof component is provided between two adjacent hollow structures and is used to fix the protection tube 11 , the air inlet pipe 6 and the air outlet pipe 5 .

[0069] The anti-vibration assembly includes anti-vibration block A4, anti-vibration block B7 and anti-vibration block C10;

[0070] As shown in FIG5a , the diameter of the shockproof block A4 is equal to the inner diameter of the protection tube 11 , and the shockproof block A4 is provided with two through holes A corresponding to the air inlet pipe 6 and the air outlet pipe 5 , as well as a plurality of water flow holes A for the stack water flow channel;

[0071] As shown in FIG5b , the diameter of the shockproof block B7 is equal to the inner diameter of the protection tube 11 , and the shockproof block B7 is provided with two through holes B corresponding to the air inlet pipe 6 and the air outlet pipe 5 , as well as a plurality of water flow holes B for the stack water flow channel;

[0072] As shown in FIG5c , the diameter of the shockproof block C10 is equal to the difference between the inner diameter of the protection tube 11 and the diameter of the air inlet pipe 6 / air outlet pipe 5. A plurality of circular grooves are provided on the circumference of the shockproof block C10. The radius of the circular grooves is equal to the radius of the air inlet pipe 6 / air outlet pipe 5.

[0073] The two ends of the air inlet pipe 6 and the two ends of the air outlet pipe 5 are fixed through the through hole A and / or the circular groove, and the middle of the air inlet pipe 6 and the middle of the air outlet pipe 5 are fixed through the through hole B.

[0074] The distance between the center axes of the two through holes B is smaller than the distance between the two through holes A.

[0075] By setting up different types of shock-proof blocks, it is possible to prevent disturbances caused by airflow and water flow to the air inlet pipe 6 and the air outlet pipe 5, thereby stabilizing the balance of the air inlet pipe 6, the air outlet pipe 5 and the entire device.

[0076] As shown in Figures 8 and 9, the fixing assembly includes a flange assembly and a locking mechanism 16. The locking mechanism 16 and the protective tube 11 are respectively arranged on both sides of the flange assembly. The protective tube 11 is fixedly connected to the flange assembly. The locking mechanism 16 clamps the air inlet pipe 6 and the air outlet pipe 5, and the locking mechanism 16 applies a force to the flange assembly toward the irradiation tube 2.

[0077] The flange assembly includes: a flange 12 and a reinforcing rib 13. The other end of the protective tube 11 is fixedly connected to the flange 12 and fixed by multiple reinforcing ribs 13. The flange 12 is provided with through holes for the air inlet pipe 6 and the air outlet pipe 5 to pass through; the flange 12 is fixedly connected to the fixed flange at the top of the reactor core by bolts 15 and gaskets 14.

[0078] The plurality of reinforcing ribs 13 are fully welded together with the positioning flange and the protective tube 11 to further improve the structural strength of the device.

[0079] Locking mechanism 16 includes locking blocks A17 and B19. The opposing surfaces of locking blocks A17 and B19 are provided with arcuate grooves that mate with the inlet pipe 6 and outlet pipe 5. These arcuate grooves connect locking blocks A17 and B19 to form a circular hole that clamps the inlet pipe 6 and outlet pipe 5. Locking blocks A17 and B19 are secured together with screws 20, exerting a clamping force on the inlet pipe 6 and outlet pipe 5. The two locking mechanisms 16 respectively clamp the inlet pipe 6 and outlet pipe 5. A rubber sleeve 18 is placed between the inlet pipe 6 and outlet pipe 5 and the locking mechanisms 16.

[0080] The main function of the locking mechanism 16 is to prevent the air pipe from moving up and down. The air inlet pipe 6 and the air outlet pipe 5 wrapped by the rubber sleeve 18 will be clamped by the locking block A17 and the locking block B19 after passing through the flange, and fixed with screws 20. Before clamping, a certain pulling force is ensured on the air inlet pipe 6 and the air outlet pipe 5, which can prevent the air inlet pipe 6 and the air outlet pipe 5 from moving up and down during actual work.

[0081] In this embodiment, the materials including but not limited to the irradiation tube 2 , the lower joint 1 , the upper cover plate 3 , and the protection tube 11 can all be made of 6061 aluminum alloy.

[0082] Example 2

[0083] Before production after on-site installation, the sealing of the entire device is particularly important. Therefore, this embodiment provides a sealing detection method, which includes a vacuuming process and a helium pressure maintaining process.

[0084] Vacuuming process: First, seal the air inlet joint of the air inlet pipe 6, and use a vacuum pump to extract all the gas in the irradiation tube 2 from the air outlet interface of the air outlet pipe 5. After evacuation, connect an external pressure gauge and seal the air outlet joint 8 of the air outlet pipe 5. If the pressure value on the pressure gauge is almost 0kPa for a long time (more than 24h), it means that the airtight performance of the irradiation device meets the technical requirements.

[0085] Helium pressure maintenance process: After completing the above vacuuming process, it is confirmed that the irradiation device has the ability to vacuum during the test phase after installation. Next, the helium pressure maintenance process will be carried out. First, connect the helium cylinder to the air inlet connector, open the helium cylinder, and introduce helium into the irradiation tube 2 through the air inlet interface. When the air pressure reaches 104-110kPa, close the helium cylinder; seal the air inlet connector, and record the pressure gauge value every 2 hours. If the recorded pressure value remains stable for more than 24 hours, it indicates that the irradiation device is in a gas-filled state. The pressure maintenance test is normal and can meet the technical requirements of the subsequent iodine-125 thermal experiment.

[0086] The beneficial effects that this device can achieve:

[0087] The irradiation device of the present invention is mainly used to support the production of iodine-125 by a new continuous cycle loop irradiation method. The target gas can quickly enter the bottom of the irradiation device from the inactive area and be discharged from the top of the irradiation device after being irradiated by neutrons. The generated iodine-125 is captured by the iodine adsorption device, and the undecayed target gas continues to complete the cycle irradiation. This process greatly reduces the manual operation process, improves work efficiency, and meets the technical requirements for large-scale continuous cycle irradiation production of iodine-125.

[0088] The irradiation device of the present invention undergoes strict airtightness helium inspection before leaving the factory, as well as airtightness verification and debugging after the device is installed, thereby ensuring that the target gas always flows normally in the circulation loop and preventing the reactor pool water from leaking into the irradiation device, causing the circulation loop product to be affected by external factors.

[0089] The irradiation device of the present invention is installed in the water channel of the reactor. The protective tube 11 and the support plate 9 are designed with water inlet and outlet openings. Hot water in the reactor pool can directly enter to heat the inlet and outlet pipes 5, which is beneficial to prevent the generated iodine-125 from crystallizing on the inner wall of the pipe, thereby increasing the adsorption capacity of iodine-125 by the iodine adsorption device.

[0090] The lower joint 1, shock-absorbing block, flange 12, and locking mechanism 16 of the irradiation device of the present invention play a key role in stabilizing the device. They offer strong resistance to interference from air and water flow, contributing to maintaining the normal operation of the entire circulation loop and iodine-125 irradiation production. Furthermore, they play a significant role in resisting disasters such as earthquakes.

[0091] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine different embodiments / methods or examples described in this specification and the features of different embodiments / methods or examples, unless they are contradictory.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0093] It should be understood by those skilled in the art that the above embodiments are merely for the purpose of illustrating the present invention clearly, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. An irradiation device for producing iodine-125 by reactor irradiation, It is characterized in that include: An irradiation tube (2), both ends of which are sealed by a lower joint (1) and an upper cover plate (3) to form an irradiation test section, and the upper cover plate (3) is provided with two air holes; An air inlet pipe (6) and an air outlet pipe (5), which are fixedly connected to the upper cover plate (3), and the air inlet pipe (6) and the air outlet pipe (5) are connected to the interior of the irradiation test section through the two air holes; A protection tube (11), a first end of which is fixedly connected to the upper cover plate (3) via a support sheet (9), the other end of the protection tube (11) being mounted on the top of the reactor core via a fixing assembly, and the air inlet pipe (6) and the air outlet pipe (5) being both arranged in the protection tube (11); The air outlet of the air inlet pipe (6) is arranged on a side close to the lower joint (1), the air inlet of the air outlet pipe (5) is arranged on a side close to the upper cover plate (3), the air inlet of the air inlet pipe (6) passes through the fixed component to weld the air inlet joint, and the air outlet of the air outlet pipe (5) passes through the fixed component to weld the air outlet joint (8).

2. An irradiation device for producing iodine-125 by reactor irradiation according to claim 1, It is characterized in that The air inlet pipe (6) and the air outlet pipe (5) are symmetrically distributed with the central axis of the upper cover plate (3) as the symmetry axis, the support sheet (9) comprises a first arc-shaped sheet and a second arc-shaped sheet, the first arc-shaped sheet and the second arc-shaped sheet are symmetrical arc-shaped, and the outer arc surface radius of the first arc-shaped sheet and the second arc-shaped sheet is equal to the inner diameter of the protection tube (11); The air outlet of the air inlet pipe (6), the first arc-shaped piece, the air inlet of the air outlet pipe (5) and the second arc-shaped piece are arranged in sequence and spaced apart.

3. An irradiation device for producing iodine-125 by reactor irradiation according to claim 1, It is characterized in that The protective tube (11) is provided with a plurality of groups of hollow structures, which are distributed in sequence along the axial direction of the protective tube (11); the hollow structures include a plurality of strip-shaped hollow holes, which are evenly distributed in a ring shape along the central axis of the protective tube (11).

4. An irradiation device for producing iodine-125 by reactor irradiation according to claim 3, It is characterized in that A shockproof component is also provided in the protection tube (11), and the shockproof component is provided between two adjacent hollow structures and is used to fix the protection tube (11), the air inlet pipe (6) and the air outlet pipe (5).

5. An irradiation device for producing iodine-125 by reactor irradiation according to claim 4, It is characterized in that The anti-vibration assembly comprises an anti-vibration block A (4), an anti-vibration block B (7) and an anti-vibration block C (10); The diameter of the shockproof block A (4) is equal to the inner diameter of the protection tube (11), and the shockproof block A (4) is provided with two through holes A corresponding to the air inlet pipe (6) and the air outlet pipe (5), and a plurality of water flow holes A for the stack water flow channel; The diameter of the shockproof block B (7) is equal to the inner diameter of the protection tube (11), and the shockproof block B (7) is provided with two through holes B corresponding to the air inlet pipe (6) and the air outlet pipe (5), and a plurality of water flow holes B for the stack water flow channel; The diameter of the shockproof block C (10) is equal to the difference between the inner diameter of the protection tube (11) and the diameter of the air inlet pipe (6) / the air outlet pipe (5), and a plurality of circular grooves are arranged on the circumference of the shockproof block C (10), and the radius of the circular grooves is equal to the radius of the air inlet pipe (6) / the air outlet pipe (5); Wherein, both ends of the air inlet pipe (6) and both ends of the air outlet pipe (5) are respectively fixed through the through hole A and / or the circular groove, and the middle part of the air inlet pipe (6) and the middle part of the air outlet pipe (5) are respectively fixed through the through hole B; The distance between the central axes of the two through holes B is smaller than the distance between the two through holes A.

6. An irradiation device for producing iodine-125 by reactor irradiation according to claim 1, It is characterized in that The fixing assembly comprises a flange assembly and a locking mechanism (16); the locking mechanism (16) and the protective tube (11) are respectively arranged on both sides of the flange assembly; the protective tube (11) is fixedly connected to the flange assembly; the locking mechanism (16) clamps the air inlet pipe (6) and the air outlet pipe (5); and the locking mechanism (16) applies a force to the flange assembly toward the irradiation tube (2).

7. An irradiation device for producing iodine-125 by reactor irradiation according to claim 6, It is characterized in that The flange assembly comprises: a flange plate (12) and a reinforcing rib (13); the other end of the protection tube (11) is fixedly connected to the flange plate (12) and fixed by a plurality of the reinforcing ribs (13); the flange plate (12) is provided with through holes for the air inlet pipe (6) and the air outlet pipe (5) to pass through; The flange plate (12) is fixedly connected to the fixed flange at the top of the reactor core by bolts (15).

8. An irradiation device for producing iodine-125 by reactor irradiation according to claim 6, It is characterized in that The locking mechanism (16) comprises: a locking block A (17) and a locking block B (19); the opposite surfaces of the locking block A (17) and the locking block B (19) are provided with arc-shaped clamping grooves adapted to the air inlet pipe (6) / the air outlet pipe (5); the locking block A (17) and the locking block B (19) are spliced ​​into a circular hole through the arc-shaped clamping groove and clamp the air inlet pipe (6) / the air outlet pipe (5); the locking block A (17) and the locking block B (19) are fixed by screws (20) and apply a clamping force to the air inlet pipe (6) / the air outlet pipe (5); Wherein, two locking mechanisms (16) clamp the air inlet pipe (6) and the air outlet pipe (5) respectively.

9. An irradiation device for producing iodine-125 by reactor irradiation according to claim 8, It is characterized in that A rubber sleeve (18) is coated between the air inlet pipe (6) / the air outlet pipe (5) and the locking mechanism (16).

10. An irradiation device for producing iodine-125 by reactor irradiation according to claim 1, It is characterized in that The irradiation tube (2), the lower joint (1), the upper cover plate (3) and the protective tube (11) are all made of 6061 aluminum alloy.

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