An irradiation device for producing I-125 by stack irradiation

Abstract

The present invention discloses an irradiation device for producing I‑125 by irradiation, comprising an irradiation container, a connecting conduit and a stopper; the irradiation container is connected to the stopper through the connecting conduit; the stopper and the connecting conduit are respectively fixed relatively to the irradiation container and the stopper to realize the limiting function; the size of the stopper matches the channel opening. The beneficial effects of the present invention are as follows: 1. The irradiation container is limited by the stopper and the connecting conduit, so as to ensure the position of the irradiation container and realize safe production. 2. The stopper includes two layers of a fixed plug and a channel opening plug, which plays a dual fixing role and is safe and reliable. 3. The channel bottom support further ensures that the irradiation device is in the active area, and plays a supporting role to prevent it from hitting the wall and tipping over. 4. The protective sleeve is used to protect the weld, increase the weld strength, and prevent the water in the reactor pool from corroding the weld.

Description

Technical Field

[0001] The invention relates to the field of nuclear chemical industry, and in particular to a target cutting and de-targeting device for irradiating uranium foil targets. Background Art

[0002] 125 I is a long half-life (T 1 / 2 =59.7d) of iodine radioactive isotope, which releases low-energy gamma rays (27KeV, X-rays) through electron capture. 125 I has a long half-life, low gamma ray energy, and no beta radiation, and is widely used in nuclear medicine clinical diagnosis, biomedical research, and tumor close-range treatment (X-ray seed source). Especially in recent years, 125 The medical application of I seeds has developed very rapidly. 125 I-seed sources can be used for brachytherapy of various malignant tumors (head and neck, digestive system, chest and urinary system tumors, etc.). 125 I achieves the purpose of treatment by continuously releasing radiation at a short distance, causing maximum damage to tumor tissue while leaving normal tissue undamaged or only minimally damaged. 125 The therapeutic efficacy of I particle sources in the treatment of malignant tumors has been confirmed and is considered to be a safe, effective and low-complication treatment technology. 125 The medical application of I is becoming more and more extensive. 125 The demand for I is growing rapidly.

[0003] At present, there is no irradiation device suitable for the production of I-125 by stack irradiation in the prior art.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide an irradiation device for producing I-125 by reactor irradiation, which can at least achieve the purpose of producing I-125 by reactor irradiation and can also ensure that the active area of ​​the core is fully utilized for irradiation production.

[0006] The technical solution of the present invention is as follows:

[0007] An irradiation device for producing I-125 by stacking, comprising a stacking container, a connecting conduit and a stopper; the stacking container is connected to the stopper through the connecting conduit; the stopper and the connecting conduit are respectively fixed relatively to the stacking container and the stopper to realize the limit function; the size of the stopper matches the channel opening.

[0008] Furthermore, in the above-mentioned irradiation device for stack irradiation production of I-125, the limit plug includes a channel mouth plug and a fixed plug; the channel mouth plug is divided into two layers, the lower layer is flush with the channel mouth, and the upper layer is sized to be stretched on the channel mouth; the fixed plug is arranged on the upper side of the channel mouth plug and is fixedly connected to the connecting conduit; conduit through holes are opened at corresponding positions of the fixed plug and the channel mouth plug.

[0009] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, the channel mouth plug and the fixed plug are also provided with convection holes corresponding to each other in position.

[0010] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, the convection flow holes are oblong through holes.

[0011] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, the conduit through hole is arranged at the center position of the channel mouth plug.

[0012] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, the connecting conduit is fixed to the fixing plug by welding.

[0013] Furthermore, the above-mentioned irradiation device for producing I-125 by stacking also includes a channel bottom support, and the channel bottom support includes a support plate, a tray and a bracket; the two ends of the bracket are respectively connected to the support plate and the tray; the support plate is supported on the bottom of the channel, and the tray is used to support the stacking container.

[0014] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, the irradiation container includes a bottle body; a head is provided at the lower end of the bottle body, and a head connecting column is provided at the upper end; the head connecting column is connected to the connecting conduit and is provided with a through hole connecting the connecting conduit and the inside of the bottle body.

[0015] Furthermore, in the above-mentioned irradiation device for producing I-125 by stack irradiation, a protective sleeve capable of protecting the connection portion between the connecting conduit and the head connecting column is provided on the outside of the head connecting column.

[0016] Furthermore, the above-mentioned irradiation device for producing I-125 by stack irradiation also includes a support tube, which is sleeved outside the connecting guide tube, one end of which is connected to the head connecting column, and the other end is supported by the limit plug.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The irradiation container is limited by the limit plug and the connecting conduit, so as to ensure the position of the irradiation container and realize safe production.

[0019] 2. The limit plug consists of two layers: a fixed plug and a hole plug, which plays a dual fixing role and is safe and reliable.

[0020] 3. The channel bottom support further ensures that the irradiation device is within the active area and plays a supporting role to prevent it from hitting the wall or tipping over.

[0021] 4. The protective casing is used to protect the weld, increase the weld strength, and prevent the weld from being corroded by water in the reactor pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the irradiation device used for stack irradiation production of I-125 according to the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the stacking container.

[0024] Figure 3 It is a schematic diagram of the structure of the channel mouth plug.

[0025] Figure 4 It is a schematic diagram of the structure of the fixed plug.

[0026] Figure 5 It is a structural schematic diagram of the channel base.

[0027] In the above drawings, 1. irradiation container; 2. protective sleeve; 3. connecting conduit; 4. channel mouth plug; 5. fixing plug; 6. support tube; 11. head; 12. bottle body; 13. head connecting column; 41. conduit through hole; 42. convection hole; 51. conduit through hole; 52. convection hole; 61. support plate; 62. bracket; 63. tray. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, the present invention provides an irradiation device for producing I-125 by irradiation, comprising an irradiation container 1, a connecting conduit 3 and a limit plug; the irradiation container 1 is connected to the limit plug through the connecting conduit 3; the limit plug and the connecting conduit 3 are respectively fixed relatively to the irradiation container 1 and the limit plug to realize the limiting function; the size of the limit plug matches the channel opening.

[0030] The heat inside the irradiation bottle mainly comes from the prompt neutron collision heat and delayed gamma photon heat of the irradiated material, and the heat of the nuclear reaction of thermal neutrons absorbed by the gas target. The heating power depends on the reactor operating power and the amount of sample material. According to the reactor operating power and the required amount of irradiated material, the safety of irradiation can be guaranteed through thermal analysis.

[0031] like Figure 2As shown, the irradiation container 1 is the main body of the irradiation system, which is placed in the active area of ​​the vertical channel of the reactor and has the shape of a long cylinder; it includes a bottle body 12; a head 11 is provided at the lower end of the bottle body 12, and a head connection column 13 is provided at the upper end; the head 11 is welded to the bottom end of the bottle body 12, which can ensure strength and meet the requirements of thermal safety of the reactor. The head connection column 13 is connected to the connecting conduit 3 and is provided with a through hole connecting the connecting conduit 3 with the inside of the bottle body 12. A protective sleeve 2 capable of protecting the connecting part between the connecting conduit 3 and the head connection column 13 is provided on the outside of the head connection column 13. Further, this embodiment also includes a support tube 6, which is sleeved outside the connecting conduit 3, one end of which is connected to the head connection column 13, and the other end is supported by the limit plug; avoiding the connection conduit 3 from being subjected to force is to ensure the safety of the irradiation bottle in the channel.

[0032] The irradiation container is fixed on the guide box through the channel mouth plug 4 and the fixed plug 5, and is connected to the off-core gas circulation loop system through the connecting pipe 3. The irradiation system in the channel is relatively long. Since the reactor pool water is acidic with a pH value of about 5.5-6.5, a welded protective sleeve 2 is installed at the welding point between the irradiation container 1 and the connecting pipe 3 to protect the weld, increase the weld strength, and prevent the water in the reactor pool from corroding the weld.

[0033] The irradiation container is installed in the active area of ​​the vertical channel of the reactor and is led out of the channel by a longer connecting pipe 3. Safety requirements require that the irradiation container cannot contact the channel wall to prevent the irradiation container from contacting the channel wall and generating a nucleate boiling state at the contact point, causing the heat generated by the irradiation container during the irradiation process to not be released in time, and the temperature of the irradiation container rises rapidly, causing the irradiation container wall to burn through. The irradiation container is centrally positioned by the channel port plug 4 and the fixing plug 5, and the support tube connecting the irradiation container to the channel port plug 4 is welded to enhance the vertical suspension strength of the irradiation container, control the position of the irradiation container 1 in the channel, and prevent it from swinging left and right.

[0034] The limit plug includes a channel mouth plug 4 (see Figure 3 ) and fixing plug 5 (see Figure 4); the channel mouth plug 4 is divided into two layers, the lower layer is flush with the channel mouth, and the upper layer is sized to be stretched on the channel mouth; the fixed plug 5 is arranged on the upper side of the channel mouth plug 4 and is fixedly connected to the connecting conduit 3; the corresponding positions of the fixed plug 5 and the channel mouth plug 4 are provided with conduit through holes (41, 51). The stacking container 1 has a strong buoyancy in water, so the channel mouth plug 4 made of stainless steel can also be counterweighted to ensure that the stacking bottle sinks into the channel. The channel mouth plug 4 and the fixed plug 5 are also provided with convection holes (42, 52) corresponding to each other. The convection holes (42, 52) are oblong through holes. The conduit through hole 41 is arranged at the center of the channel mouth plug 4. The conduit through hole (41, 51) is used to pass through the connecting conduit 3 of the irradiation container 1, and at the same time, the center of the irradiation container 1 is limited to prevent the irradiation container from contacting the channel wall and possibly burning through. The convection flow hole can release the heat generated in the channel in time through convection exchange to ensure the thermal safety of the irradiation bottle. Since the channel mouth plug 4 is made of stainless steel and cannot be welded and fixed to the aluminum connecting conduit 3 of the irradiation bottle, the material of the fixed plug 5 is set to be aluminum. The fixed plug 5 is positioned and welded with the connecting conduit 3 to limit the position of the irradiation bottle to the designed fixed position, and plays a dual fixing role together with the channel mouth plug 4.

[0035] like Figure 5 As shown, in this embodiment, a channel bottom support is also included, and the channel bottom support includes a support plate 61, a tray 63 and a bracket 62; the two ends of the bracket 62 are respectively connected to the support plate 61 and the tray 63; the support plate 61 is supported at the bottom of the channel, and the tray 63 is used to support the irradiation container 1. The active area in the vertical channel of the reactor is still a long distance away from the bottom of the channel. In order to ensure the absolute safety of the irradiation bottle in the active area of ​​the inner channel, a channel bottom support is placed at the bottom of the channel to support the bracket irradiation bottle. In order to ensure that the irradiation container absolutely does not contact the channel wall, the tray 63 is set to a polygon (preferably an octagon). Even if it is flushed and shaken by cooling water, the heat release distance between the irradiation bottle and the channel wall is guaranteed, and the irradiation container and the tray 63 will not be in contact with the channel wall without gaps. The channel bottom support is made of aluminum material that meets the thermal safety of the reactor, and is placed outside the active area of ​​the channel to support the irradiation bottle and ensure the stability of the irradiation bottle.

[0036] The present invention is aimed at the demand for producing 100-curie-level I-125 in reactors, and uses a limiting device to cleverly fix it in the core channel, so as to make full use of the core active area for irradiation. It not only meets the requirements of reactor safety, but also meets the requirements of producing a certain amount of iodine-125. In addition, the operation is simple, the device of the target material is easy to control, the pressure resistance of the target meets the strength requirements, and the performance is stable and reliable in the process of producing iodine-125 by reactor irradiation.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An irradiation device for producing I-125 by stack irradiation, characterized in that: The invention comprises an irradiation container (1), a connecting conduit (3) and a stopper; the irradiation container (1) is connected to the stopper via the connecting conduit (3); the connecting conduit (3) is fixed relative to the irradiation container (1) and the stopper respectively to realize a stopper function; the size of the stopper matches the hole opening; the stopper comprises a hole opening plug (4) and a fixing plug (5); the hole opening plug (4) is divided into two layers, the lower layer is flush with the hole opening, and the upper layer is sized to be able to stretch on the hole opening; the fixing plug (5) is arranged on the upper side of the hole opening plug (4) and is fixedly connected to the connecting conduit (3); the fixing plug (5) and the hole opening plug (4) are provided with conduit through holes at corresponding positions; It also includes a channel bottom support, the channel bottom support including a support plate (61), a tray (63) and a bracket (62); the two ends of the bracket (62) are respectively connected to the support plate (61) and the tray (63); the support plate (61) is supported on the bottom of the channel, and the tray (63) is used to support the stacking container (1); The irradiation container (1) comprises a bottle body (12); a head (11) is arranged at the lower end of the bottle body (12), and a head connection column (13) is arranged at the upper end; the head connection column (13) is connected to the connecting conduit (3) and is provided with a through hole connecting the connecting conduit (3) and the inside of the bottle body (12); a protective sleeve (2) capable of protecting the connection portion between the connecting conduit (3) and the head connection column (13) is arranged outside the head connection column (13).

2. The irradiation device for producing I-125 by stack irradiation according to claim 1, characterized in that: The channel opening plug (4) and the fixed plug (5) are also both provided with convection holes (42, 52) at positions corresponding to each other.

3. The irradiation device for producing I-125 by stack irradiation according to claim 2, characterized in that: The convection holes (42, 52) are oblong through holes.

4. The irradiation device for producing I-125 by stack irradiation according to claim 2, characterized in that: The conduit through hole (41) is arranged at the center position of the channel opening plug (4).

5. The irradiation device for producing I-125 by stack irradiation according to claim 1, characterized in that: The connecting conduit (3) is fixed to the fixing plug (5) by welding.

6. The irradiation device for producing I-125 by stack irradiation according to claim 1, characterized in that: It also comprises a support tube, which is sleeved outside the connecting conduit (3), one end of which is connected to the end cap connecting column (13), and the other end of which is supported by the stopper.

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