JP7598278B2 - RI manufacturing equipment and target storage device - Google Patents

Description

The present invention relates to a target storage device.

Radioisotopes used in the test agents for PET (Positron Emission Tomography) tests are produced using a radiation source such as a cyclotron installed near a test room in a hospital. Specifically, a particle beam (e.g., a proton beam, a deuteron beam, or the like) from the radiation source is guided to a target storage device, and a radioisotope is produced by a nuclear reaction with a target (e.g., target water ( ^18O water)) stored in the target storage device. Then, the produced radioisotope is incorporated into a predetermined compound (e.g., fluorodeoxyglucose (FDG)) or partially replaced therewith to synthesize the test agent.

As an RI manufacturing device for producing such radioisotopes, a device is known that is equipped with a container that contains a liquid target and a flow path that cools the container from one side of the particle beam irradiation axis (see, for example, Patent Document 1).

JP 2013-246131 A

Here, the target becomes hot when irradiated with particle beams. In response to this, the efficiency of the nuclear reaction can be improved by improving the cooling efficiency of the target. Therefore, there is a demand for a target storage device that can improve the cooling efficiency, and an RI production device that can improve the efficiency of the nuclear reaction.

The present invention has been made in consideration of the above, and aims to provide a target storage device that can improve cooling efficiency, and an RI production device that can improve the efficiency of nuclear reactions.

In order to achieve the above object, an RI manufacturing apparatus according to one embodiment of the present invention is an RI manufacturing apparatus that manufactures radioisotopes by a nuclear reaction of a target irradiated with a particle beam, and includes a storage section that stores the target at the irradiation position of the particle beam, a first flow path that allows a cooling medium to flow so as to cool the storage section from one side relative to the irradiation axis of the particle beam, and a second flow path that allows a cooling medium to flow through at least a part of a wall section provided around the irradiation axis of the storage section so as to cool the storage section from the outside of the storage section with respect to the irradiation axis.

The RI manufacturing apparatus includes a first flow path that allows a cooling medium to flow so as to cool the storage unit from one side relative to the irradiation axis of the particle beam. As a result, by flowing the cooling medium through the first flow path, the target in the storage unit can be cooled from one side relative to the irradiation axis. Furthermore, the RI manufacturing apparatus includes a second flow path that allows a cooling medium to flow so as to cool the storage unit from the outside of the storage unit with respect to the irradiation axis through at least a part of a wall portion provided around the irradiation axis with respect to the storage unit. In this case, by flowing the cooling medium through the second flow path, the target in the storage unit can be cooled by removing heat from the storage unit from the inside to the outside with respect to the irradiation axis through the wall portion around the irradiation axis. In this way, the first flow path and the second flow path make it possible to cool the target from different directions. Therefore, the cooling efficiency of the target can be improved, and the efficiency of the nuclear reaction of the target can be improved.

The second flow path may be capable of cooling a portion of the storage section that is capable of storing the liquid target. In this case, the second flow path can suppress evaporation of the liquid target by cooling the liquid target that becomes hot when irradiated with the particle beam. This can improve the efficiency of the nuclear reaction in the liquid target.

The second flow path may be capable of cooling a portion of the storage section that is capable of storing a gas target. In this case, the second flow path can liquefy the gas target by cooling it. Therefore, by increasing the amount of liquid target, the efficiency of the nuclear reaction can be improved.

The storage section has a first storage section capable of storing a liquid target, and a second storage section communicating with the first storage section and capable of storing a gas target, and the second flow path may be capable of cooling the storage section from the opposite side of the second storage section to the first flow path with respect to the irradiation axis. In this case, the liquid target in the first storage section is irradiated with a particle beam and evaporated, and accumulates as a gas target in the second storage section. In contrast, the first flow path and the second flow path can cool the gas target from both sides of the irradiation axis. This allows the gas target to be liquefied by cooling, and returned to the first storage section as a liquid target. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of liquid target.

A member that obstructs the flow of the cooling medium may be provided in the second flow path. In this case, the member obstructs the flow of the cooling medium in the second flow path, thereby changing the laminar flow to a turbulent flow, thereby improving the cooling efficiency.

A target storage device according to one embodiment of the present invention is a target storage device that stores a target capable of producing a radioisotope through a nuclear reaction when irradiated with a particle beam, and includes a storage section that stores the target, a first flow path that allows a cooling medium to flow from one side of the irradiation axis of the particle beam when the target is irradiated with the particle beam so as to cool the storage section, and a second flow path that allows a cooling medium to flow through at least a portion of a wall section provided around the irradiation axis of the storage section so as to cool the storage section from the outer periphery side of the wall section.

The target storage device includes a first flow path that allows a cooling medium to flow so as to cool the storage unit from one side relative to the irradiation axis of the particle beam. This allows the cooling medium to flow through the first flow path, thereby allowing the target in the storage unit to be cooled from one side relative to the irradiation axis. Furthermore, the target storage device includes a second flow path that allows a cooling medium to flow through at least a part of a wall portion provided around the irradiation axis for the storage unit, so as to cool the storage unit from the outside of the storage unit with respect to the irradiation axis. In this case, by flowing the cooling medium through the second flow path, the target in the storage unit can be cooled from the outer periphery side through the wall portion around the irradiation axis. In this way, the first flow path and the second flow path make it possible to cool the target from different directions. Therefore, the cooling efficiency of the target can be improved.

The present invention provides a target storage device that can improve cooling efficiency and an RI production device that can improve the efficiency of nuclear reactions.

1 is a cross-sectional view of an RI manufacturing apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of the RI manufacturing apparatus. 2 is a cross-sectional view of the target storage device according to the embodiment. FIG. FIG. 2 is a perspective view of a target containing device. 5 is a diagram illustrating a flow of a cooling medium in the target accommodation device. FIG. FIG.

Below, the embodiment of the present invention will be described in detail with reference to the attached drawings. Note that in the description of the drawings, the same elements are given the same reference numerals and duplicated descriptions will be omitted.

FIG. 1 is a cross-sectional view of an RI manufacturing apparatus 1. The RI manufacturing apparatus 1 includes a target storage device 10 which is an embodiment of the RI manufacturing apparatus of the present invention. The RI manufacturing apparatus 1 manufactures radioisotopes (RI). The RI manufacturing apparatus 1 can be used, for example, as a cyclotron for PET, and the RI manufactured by the RI manufacturing apparatus 1 is used, for example, for manufacturing radiopharmaceuticals (including radiopharmaceuticals) which are radioisotope-labeled compounds (RI compounds). Radioisotope-labeled compounds used in PET examinations (positron emission tomography examinations) in hospitals and the like include ¹⁸ F-FLT (fluorothymidine), ¹⁸ F-FMISO (fluorosonidazole), ¹¹ C-raclopride, and the like.

The RI manufacturing device 1 is a so-called self-shielded particle accelerator system, and includes an accelerator (cyclotron) 2 that accelerates charged particles, and a self-shield 6 that is a radiation shield (wall) that surrounds the accelerator 2 to block radiation. In the internal space S formed to be surrounded by the self-shield 6, in addition to the accelerator 2, a target accommodation device 10 used to manufacture RI, a vacuum pump 4 for creating a vacuum inside the accelerator 2, and the like are arranged. Furthermore, the internal space is also arranged with accessories necessary for the operation of the accelerator 2, and auxiliary equipment used to cool the target accommodation device 10, and the like.

The accelerator 2 is a so-called vertical cyclotron, and has a pair of magnetic poles, a vacuum box, and an annular yoke that surrounds the pair of magnetic poles and the vacuum box. The pair of magnetic poles face each other with a specified distance between their upper surfaces inside the vacuum box. Charged particles such as hydrogen ions are multiplexed and accelerated in the gap between the pair of magnetic poles. The vacuum pump 4 is used to maintain a vacuum environment inside the accelerator 2, and is fixed, for example, to the side of the accelerator 2. The accelerator 2 emits a charged particle beam in the irradiation direction indicated by the arrow B in the figure.

The target accommodation device 10 is for manufacturing RI by receiving a charged particle beam irradiated from the accelerator 2, and has an accommodation section for accommodating raw materials (e.g., target water; ¹⁸ O water) formed therein. The target accommodation device 10 is generally fixed to the side of the accelerator 2 as shown in Figs. 1 and 2. The RI manufacturing apparatus 1 of this embodiment includes two target accommodation devices 10 arranged on both sides of the accelerator 2. For example, the target accommodation device 10 arranged on the left side of the figure is arranged on the upper stage side, and the target accommodation device 10 arranged on the right side of the figure is arranged on the lower stage side (see Fig. 2). The target accommodation device 10 is covered by a target shield 7 provided on the accelerator 2. The self-shield 6 is made of a plurality of parts and is formed to cover the accelerator 2 and the target accommodation device 10.

Next, the target storage device 10 provided in the RI manufacturing apparatus 1 of the present invention will be described in more detail with reference to Figs. 3 and 4. Fig. 3 is a cross-sectional view of the target storage device 10 according to this embodiment. Fig. 3 is a cross-sectional view of the target storage device 10 cut at the position of the irradiation axis RL. Fig. 4 is a cross-sectional perspective view of a portion of the target storage device 10 cut away. Please refer mainly to Fig. 3, and also to Fig. 4 as necessary.

As shown in FIG. 3, the target storage device 10 according to this embodiment includes a foil 2, a storage section 3, and cooling mechanisms 4A and 4B. The radioisotope manufacturing device includes the above-mentioned target storage device 10 and an accelerator (not shown). For example, a cyclotron is used as the accelerator, and the accelerator generates a charged particle beam (hereinafter referred to as a "particle beam"). The generated particle beam B is irradiated to the target storage device 10 along the irradiation axis RL. Examples of the particle beam B irradiated to the target storage device 10 include particle beams such as proton beams and deuteron beams. The target storage device 10 is attached to an outlet from which the particle beam B of the accelerator is output via a manifold (not shown) arranged between the target storage device 10 and the accelerator. In the following description, the direction in which the irradiation axis RL extends may be referred to as the depth direction D1 of the target storage device 10. In addition, the side where the particle beam B is irradiated in the depth direction D1 (the upstream side in the traveling direction of the particle beam) may be referred to as the front side of the target storage device 10, and the opposite side may be referred to as the rear side of the target storage device 10. In addition, the direction perpendicular to the depth direction D1 and the up-down direction of the target storage device 10 may be referred to as the width direction D2.

When describing the positional relationship, the terms "outside" and "inside" based on the irradiation axis RL may be used. The outside based on the irradiation axis RL is the side that is farther away from the irradiation axis RL in a direction perpendicular to the irradiation axis RL. The outside based on the irradiation axis RL may be simply referred to as the "outer circumference side." The inside based on the irradiation axis RL is the side that is closer to the irradiation axis RL in a direction perpendicular to the irradiation axis RL. The inside based on the irradiation axis RL may be simply referred to as the "inner circumference side."

The target storage device 10 has, for example, a cylindrical outer shape. The target storage device 10 includes a target container 12 for mainly forming the storage section 3, a cooling mechanism forming member 13 for mainly forming the cooling mechanism 4A, and an inner ring 14 and an outer ring 15 for mainly forming the cooling mechanism 4B. The front flange 11, the target container 12, and the cooling mechanism forming member 13 are made of metal block bodies. The front flange 11, the target container 12, and the cooling mechanism forming member 13 are stacked in order from the front side to the rear side in the depth direction D1.

The foil 2 is a member that divides the storage section 3 at the front. The foil 2 is provided to the target container 12. The foil 2 allows the particle beam B to pass through while blocking the passage of fluids such as the liquid target 101 and He gas. Therefore, the particle beam B is irradiated to the foil 2, and then passes through the foil 2 to be irradiated to the liquid target 101. For example, He gas is sprayed onto the front surface of the foil 2 and used as a cooling gas for the foil 2. The foil 2 is a thin foil formed from a metal or alloy such as Ti, and has a thickness of about 10 μm to 50 μm. The foil 2 is provided so as to cover at least the entire storage section 3.

The accommodation section 3 is a portion for accommodating the liquid target 101. The accommodation section 3 is constituted by a space surrounded by a recess 22 formed in the target container 12, a hollow portion 25 formed in the target container 12 and communicating with the recess 22, and the foil 2. The target container 12 can be formed of, for example, Nb. ¹⁸ O (target water) is enclosed in the accommodation section 3 as the liquid target 101. The recess 22 is recessed toward the rear side in the depth direction D1 from, for example, a fixing surface 12a to which the foil 2 is fixed, among the front surface of the target container 12. The recess 22 has a bottom surface 22a and a peripheral surface 22b extending from the outer periphery of the bottom surface 22a toward the front side in the depth direction D1. The accommodation section 3 is circular when viewed from the depth direction D1 (see FIG. 4). The hollow portion 25 is a space extending obliquely upward from the upper end of the recess 22. The cavity 25 is inclined so as to extend upward toward the rear side in the depth direction D1. The cavity 25 communicates with the upper end of the recess 22. When viewed from the depth direction D1, the cavity 25 has a fan-like shape (see FIG. 5).

The target container 12 is formed with a gas inlet hole (not shown) for introducing an inert gas (e.g., He gas) into the container 3. The target container 12 is formed with a flow hole 26 (see FIG. 4) that is used when filling the container 3 with the liquid target 101 and when discharging the liquid target 101 from the container 3.

The storage section 3 has a first storage part E1 that stores the liquid target 101, and a second storage part E2 that is located above the first storage part E1 and receives a gas target that is formed when the boiled liquid target 101 evaporates. The second storage part E2 is formed continuously above the first storage part E1. Here, the space formed by the recess 22 corresponds to the first storage part E1, and the space formed by the hollow part 25 corresponds to the second storage part E2.

The cooling mechanism 4A cools the storage section 3 with a cooling medium on the side opposite to the irradiation direction of the particle beam B irradiated to the liquid target 101 (i.e., the rear side). The cooling mechanism 4A includes a first cooling section 30A that cools the first storage section E1, and a second cooling section 30B that cools the second storage section E2. The first cooling section 30A includes a nozzle section 32A arranged in the first internal space 31A (first flow path). The second cooling section 30B includes a nozzle section 32B arranged in the second internal space 31B (first flow path).

The first internal space 31A and the second internal space 31B are spaces for flowing a cooling medium therein. The first internal space 31A and the second internal space 31B are formed by attaching the cooling mechanism forming member 13 to the recess 30 on the rear side of the target container 12, and the space between the target container 12 and the cooling mechanism forming member 13. The first internal space 31A is formed on the rear side in the depth direction D1 with respect to the first storage part E1 of the storage part 3. The second internal space 31B is formed on the rear side in the depth direction D1 with respect to the second storage part E2 of the storage part 3. That is, the second internal space 31B is provided on the upper side of the first internal space 31A. A heat transfer wall part 34A is provided between the internal space 31A and the first storage part E1. A heat transfer wall part 34B is provided between the internal space 31B and the second storage part E2. The first internal space 31A and the second internal space 31B are separated from each other by a partition wall 36.

The first nozzle portion 32A is a member that injects the cooling medium onto the heat transfer wall portion 34A between the first storage portion E1 and the first nozzle portion 32A. The first nozzle portion 32A injects the cooling medium perpendicular to the heat transfer wall portion 34. The first nozzle portion 32A is spaced apart from the heat transfer wall portion 34. The second nozzle portion 32B is a member that injects the cooling medium onto the heat transfer wall portion 34B between the second storage portion E2 and the second nozzle portion 32B. The second nozzle portion 32B injects the cooling medium perpendicular to the heat transfer wall portion 34B. The second nozzle portion 32B is spaced apart from the heat transfer wall portion 34B.

Next, the cooling mechanism 4B will be described. First, the inner ring 14 is attached to the target container 12 so as to surround the container 3 around the irradiation axis RL. Therefore, a circular recess 40 is formed in the target container 12 so that the inner ring 14 can be attached from the outer periphery (see FIG. 4 in particular). The inner ring 14 has a half-split structure divided into semicircular members 14A and 14B, and is attached to the recess 40 from the outer periphery (see FIG. 5). The inner ring 14 has a circular ring shape with a substantially square cross section. However, at the location corresponding to the cavity 25, the inner diameter of the inner ring 14 is partially reduced (see FIG. 5), and an inclined surface 14b is formed on the inner periphery (see FIG. 4). The target container 12 is formed with a seat 40a facing the inner ring 14 on the rear side. The outer ring 15 is attached to the seat 40a so as to support the inner ring 14 attached to the recess 40 from the outer periphery.

The target container 12 has a wall portion facing the inner peripheral surface 14a of the inner ring 14 at the position of the recess 22 of the storage section 3. The wall portion is configured as a heat transfer wall portion 41 formed around the irradiation axis RL of the first storage section E1. The heat transfer wall portion 41 is formed as a cylindrical thin wall portion. The target container 12 also has a wall portion facing the inclined surface 14b of the inner ring 14 at the position of the cavity 25. The wall portion is configured as a heat transfer wall portion 42 formed around the irradiation axis RL of the second storage section E2. The heat transfer wall portion 41 is formed as a thin wall portion at a position facing the heat transfer wall portion 34B on the outer periphery side. When viewed from the depth direction, the heat transfer wall portion 42 is formed in a fan shape, and the heat transfer wall portion 41 is formed around the entire circumference of the part other than the heat transfer wall portion 42 (see FIG. 5). In addition, between the heat transfer wall portion 41 and the heat transfer wall portion 42, a step wall portion 44 is formed that rises from the seat surface 40a toward the heat transfer wall portion 42 (see FIG. 5).

Between the heat transfer wall portion 41 around the first storage portion E1 and the inner peripheral surface 14a of the inner ring 14, a cooling flow path 46 (second flow path) for flowing a cooling medium is formed. The first storage portion E1 of the storage portion 3 is provided on the inside of the heat transfer wall portion 41 with respect to the irradiation axis RL. Also, the cooling flow path 46 is provided on the outside of the heat transfer wall portion 41 with respect to the irradiation axis RL. Therefore, the cooling flow path 46 can circulate the cooling medium so as to cool the first storage portion E1 of the storage portion 3 from the outside of the first storage portion E1 of the storage portion 3 with respect to the irradiation axis RL through the heat transfer wall portion 41 provided around the irradiation axis RL with respect to the storage portion 3. The cooling flow path 46 can circulate the cooling medium so as to cool the first storage portion E1 of the storage portion 3 from the outer periphery side of the heat transfer wall portion 41 through the heat transfer wall portion 41 provided around the irradiation axis RL with respect to the storage portion 3. The cooling flow path 46 can cool the first storage portion E1 of the storage portion 3, which can store the liquid target 101. With this configuration, the cooling flow path 46 can circulate a cooling medium through the heat transfer wall portion 41 so as to remove heat from the first storage portion E1 of the storage portion 3 from the inside to the outside with respect to the irradiation axis RL.

Between the heat transfer wall 42 around the second storage portion E2 and the inclined surface 14b of the inner ring 14, a cooling flow path 48 (second flow path) for flowing a cooling medium is formed. The second storage portion E2 of the storage portion 3 is provided on the inside of the heat transfer wall 42 with respect to the irradiation axis RL. The cooling flow path 48 is also provided on the outside of the heat transfer wall 42 with respect to the irradiation axis RL. Therefore, the cooling flow path 48 can circulate the cooling medium so as to cool the second storage portion E2 of the storage portion 3 from the outside of the second storage portion E2 of the storage portion 3 with respect to the irradiation axis RL through the heat transfer wall 42 provided around the irradiation axis RL with respect to the storage portion 3. The cooling flow path 48 can circulate the cooling medium so as to cool the second storage portion E2 of the storage portion 3 from the outer periphery side of the heat transfer wall 42 through the heat transfer wall 42 provided around the irradiation axis RL with respect to the storage portion 3. The cooling flow passage 48 can cool the second storage portion E2 of the storage portion 3, which can store the gas target 102. The cooling flow passage 48 can cool the second storage portion E2 of the storage portion 3 from the opposite side of the internal space 31B with respect to the irradiation axis RL, sandwiching the second storage portion E2. According to this configuration, the cooling flow passage 48 can circulate a cooling medium through the heat transfer wall portion 42 so as to remove heat from the second storage portion E2 of the storage portion 3 from the inside to the outside with respect to the irradiation axis RL. Note that the second internal space 31B can circulate a cooling medium through the heat transfer wall portion 34B provided around the irradiation axis RL with respect to the storage portion 3 so as to cool the second storage portion E2 of the storage portion 3 from the inside of the second storage portion E2 of the storage portion 3 with respect to the irradiation axis RL. The second internal space 31B can allow a cooling medium to flow through the heat transfer wall portion 34B from the outside to the inside with respect to the irradiation axis RL, so as to remove heat from the second storage portion E2 of the storage unit 3.

Between the seat surface 40a and the inner ring 14, a flow path 47 is formed that communicates with the cooling flow path 46. The flow path 47 is connected to a cooling medium supply pipe 51 and a discharge pipe 52. Therefore, the flow path 47 supplies and recovers the cooling medium to the cooling flow paths 46 and 48.

3 and 5, the flow of the cooling medium through the cooling channels 46 and 48 will be described. The supply pipe 51 and the discharge pipe 52 are provided in the region near the lower end of the seat surface 40a. A partition wall 54 is provided between the supply pipe 51 and the discharge pipe 52 to block the flow of the cooling medium. First, the cooling medium supplied from the supply pipe 51 flows through the channel 47 (F1) and is supplied to the cooling channel 46. As a result, a part of the cooling medium flows through the cooling channel 46 (F2). At the step wall portion 44, the cooling medium flows over the step wall portion 44 (F3) and is supplied to the cooling channel 48. As a result, the cooling medium flows through the cooling channel 48 (F4). At the next step wall portion 44, the cooling medium flows down the step wall portion 44 (F5) and is supplied to the cooling channel 46 and the channel 47. This causes the cooling medium to flow through the cooling flow path 46 (F6) and then through the cooling flow path 46 (F7).

Next, the functions and effects of the RI manufacturing device 1 and the target storage device 10 according to this embodiment will be described.

The RI manufacturing device 1 has internal spaces 31A and 31B through which a cooling medium can flow so as to cool the storage unit 3 from one side (rear side) relative to the irradiation axis RL of the particle beam B. As a result, by flowing a cooling medium in the internal spaces 31A and 31B, the target in the storage unit 3 can be cooled from one side relative to the irradiation axis RL. Furthermore, the RI manufacturing device 1 has cooling channels 46 and 48 through which a cooling medium can flow so as to cool the storage unit 3 from the outside of the storage unit 3 based on the irradiation axis RL through the heat transfer wall portions 41 and 42 provided around the irradiation axis RL for the storage unit 3. In this case, by flowing a cooling medium in the cooling channels 46 and 48, the target in the storage unit 3 can be cooled by removing heat from the storage unit 3 from the inside to the outside based on the irradiation axis RL through the heat transfer wall portions 41 and 42 around the irradiation axis RL. In this way, the internal spaces 31A, 31B and the cooling channels 46, 48 make it possible to cool the target from different directions. This improves the cooling efficiency of the target, thereby improving the efficiency of the nuclear reaction in the target.

The cooling flow passage 46 may be capable of cooling the first storage portion E1 of the storage unit 3, which is capable of storing the liquid target 101. In this case, the cooling flow passage 46 can suppress evaporation of the liquid target 101 by cooling the liquid target 101, which becomes hot when irradiated with the particle beam B. This can improve the efficiency of the nuclear reaction of the liquid target 101.

The cooling flow passage 48 may be capable of cooling the second storage portion E2 of the storage section 3, which is capable of storing the gas target 102. In this case, the cooling flow passage 48 can liquefy the gas target 102 by cooling it. Therefore, by increasing the amount of the liquid target 101, the efficiency of the nuclear reaction can be improved.

The storage section 3 has a first storage section E1 capable of storing a liquid target 101, and a second storage section E2 communicating with the first storage section E1 and capable of storing a gas target 102, and the cooling flow path 48 may be capable of cooling the storage section 3 from the opposite side of the second storage section E2 to the internal space 31B with respect to the irradiation axis RL. In this case, the liquid target 101 in the first storage section E1 is evaporated by being irradiated with the particle beam B, and accumulates as the gas target 102 in the second storage section E2. In contrast, the internal space 31B and the cooling flow path 48 can cool the gas target 102 from both sides of the irradiation axis RL. As a result, the gas target 102 can be liquefied by cooling and returned to the first storage section E1 as the liquid target 101. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target 101.

The target storage device 10 also includes internal spaces 31A and 31B that allow a cooling medium to flow so as to cool the storage unit 3 from one side (rear side) relative to the irradiation axis RL of the particle beam B. As a result, by flowing a cooling medium in the internal spaces 31A and 31B, the target in the storage unit 3 can be cooled from one side relative to the irradiation axis RL. Furthermore, the target storage device 10 includes cooling channels 46 and 48 that allow a cooling medium to flow so as to cool the storage unit 3 from the outside of the storage unit 3 based on the irradiation axis RL through the heat transfer wall portions 41 and 42 provided around the irradiation axis RL for the storage unit 3. In this case, by flowing a cooling medium through the cooling channels 46 and 48, the target in the storage unit 3 can be cooled by removing heat from the storage unit 3 from the inside to the outside based on the irradiation axis RL through the heat transfer wall portions 41 and 42 around the irradiation axis RL. In this way, the internal spaces 31A, 31B and the cooling channels 46, 48 make it possible to cool the target from different directions. This improves the cooling efficiency of the target, which in turn improves the efficiency of the nuclear reaction of the target. This improves the cooling efficiency of the target.

The present invention is not limited to the above-described embodiments.

For example, the cooling flow passages 46, 48 may be provided with a member that obstructs the flow of the cooling medium. In this case, the member obstructs the flow of the cooling medium in the cooling passages 46, 48, thereby changing the laminar flow to a turbulent flow and improving the cooling efficiency. For example, as shown in FIG. 6, a member 60 that obstructs the flow of the cooling medium is provided on at least one of the inner circumferential surface 14a of the inner ring 14 and the heat transfer wall portion 41. In this case, a slit is formed in the cooling passage 46 by the member 60. The flow is obstructed by such a slit structure, causing the cooling medium to become turbulent.

The specific structure of the RI manufacturing apparatus and target storage device of the present invention is not limited to the above-mentioned embodiment.

At least one of the cooling channels 46, 48 needs to be provided, and the other may be omitted.

1...RL manufacturing device, 3...container, 10...target containment device, 31A, 31B...internal space (first flow path), heat transfer wall portion...41, 42, 46, 48...cooling flow path (second flow path).

Claims (6)

An RI production apparatus for producing a radioisotope by a nuclear reaction of a target irradiated with a particle beam, comprising:
a container for containing the target at the irradiation position of the particle beam;
a first flow path through which a cooling medium can flow so as to cool the accommodation portion from one side with respect to an irradiation axis of the particle beam;
A second flow path that allows a cooling medium to flow through at least a part of a wall portion provided around the irradiation axis of the storage portion so as to cool the storage portion from an outer side of the storage portion with respect to the irradiation axis ;
The second flow path is capable of cooling a portion of the accommodation unit capable of accommodating a gas target . An RI production apparatus for producing a radioisotope by a nuclear reaction of a target irradiated with a particle beam, comprising:
a container for containing the target at the irradiation position of the particle beam;
a first flow path through which a cooling medium can flow so as to cool the accommodation portion from one side with respect to an irradiation axis of the particle beam;
A second flow path that allows a cooling medium to flow through at least a part of a wall portion provided around the irradiation axis of the storage portion so as to cool the storage portion from an outer side of the storage portion with respect to the irradiation axis ;
The RI manufacturing apparatus , wherein the accommodation portion has a portion capable of accommodating a liquid target and a portion capable of accommodating a gas target . The RI manufacturing apparatus according to claim 1 , wherein the second flow path is capable of cooling a portion of the accommodation portion capable of accommodating a liquid target. The RI manufacturing apparatus according to claim 1 , wherein the second flow passage is provided with a member for obstructing the flow of the cooling medium. A target accommodation device that accommodates a target capable of producing a radioisotope through a nuclear reaction by being irradiated with a particle beam,
A container that contains the target;
a first flow path through which a cooling medium can flow so as to cool the accommodation portion from one side with respect to an irradiation axis of the particle beam when the particle beam is irradiated to the target;
A second flow path that allows a cooling medium to flow through at least a part of a wall portion provided around the irradiation axis of the storage portion so as to cool the storage portion from an outer side of the storage portion with respect to the irradiation axis ;
The second flow path is capable of cooling a portion of the accommodation portion capable of accommodating a gas target . A target accommodation device that accommodates a target capable of producing a radioisotope through a nuclear reaction by being irradiated with a particle beam,
A container that contains the target;
a first flow path through which a cooling medium can flow so as to cool the accommodation portion from one side with respect to an irradiation axis of the particle beam when the particle beam is irradiated to the target;
A second flow path that allows a cooling medium to flow through at least a part of a wall portion provided around the irradiation axis of the storage portion so as to cool the storage portion from an outer side of the storage portion with respect to the irradiation axis ;
The target containing device, wherein the containing section has a portion capable of containing a liquid target and a portion capable of containing a gas target .

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