TW202238625A - RI manufacturing device and target storage device capable of improving cooling efficiency and nuclear reaction efficiency - Google Patents

Abstract

To provide a target storage device capable of improving cooling efficiency and an RI manufacturing device capable of improving nuclear reaction efficiency. The RI manufacturing device (1) is provided with cooling flow paths (46, 48), wherein the cooling flow paths (46, 48) allow cooling medium to flow through heat transfer wall parts (41, 42) arranged around the irradiation axis (RL) relative to the storage part (3), and cools the storage part (3) from the outer peripheral side of the heat transfer wall parts (41, 42). At this time, by allowing the cooling medium to flow through the cooling flow paths (46, 48) and passing through the heat transfer wall parts (41, 42) provided around the irradiation axis (RL), it is possible to use the irradiation axis as a reference to cool down the target of the storage part (3) from the outer side of the aforementioned storage part. In this way, the target can be cooled from different directions through the internal spaces (31A, 31B) and the cooling flow paths (46, 48).

Description

RI manufacturing device and target storage device

The invention relates to a target storage device. This application claims priority based on Japanese Patent Application No. 2021-055409 filed on March 29, 2021. The entire content of this Japanese application is incorporated in this specification by reference.

The radioactive isotope used in the test drug for PET examination using Positron Emission Tomography (PET: Positron Emission Tomography) is manufactured using a radiation source such as a cyclotron installed in a place close to an examination room in a hospital. Specifically, the particle beams (such as proton beams, ^deuteron beams, etc.) )) carry out nuclear reactions to produce radioactive isotopes. Also, inspection agents are produced by introducing the produced radioisotope into a predetermined compound (for example, fluorodeoxyglucose (FDG: Fluoro-Deoxy-Glucose)) or substituting a part thereof for synthesis.

As an RI production apparatus for producing such a radioisotope, there is known an apparatus including: a storage unit for housing a liquid target; and a flow path for cooling the storage unit from one side of the irradiation axis of the particle beam (e.g. , refer to Patent Document 1). [Prior Art Literature]

[Patent Document 1] Japanese Unexamined Patent Publication No. 2013-246131

[Problem to be solved by the invention]

Here, the target is made high temperature by irradiating the particle beam. In contrast, by improving the cooling efficiency of the cooling target, the efficiency of the nuclear reaction can be improved. Therefore, a target storage device capable of improving cooling efficiency and an RI manufacturing device capable of improving efficiency of nuclear reactions are required.

The present invention has been made in view of the above, and an object of the present invention is to provide a target storage device capable of improving cooling efficiency and an RI manufacturing device capable of improving nuclear reaction efficiency. [Technical means to solve the problem]

In order to achieve the above object, an RI manufacturing apparatus according to an aspect of the present invention manufactures radioactive isotopes through a nuclear reaction of a target irradiated with a particle beam, and includes: a storage unit for storing the target at the irradiation position of the particle beam; The second flow path is capable of allowing the cooling medium to flow through and cool the storage part from one side of the irradiation axis of the particle beam; At least a part of the storage part is cooled from the outside of the storage part based on the irradiation axis.

The RI production apparatus includes a first flow channel through which a cooling medium can flow to cool the storage unit from the side of the irradiation axis of the particle beam. Thereby, by making the cooling medium flow through the first flow path, it is possible to cool the target in the storage unit from one side of the irradiation axis. Furthermore, the RI manufacturing apparatus is provided with a second flow path which allows the cooling medium to flow through at least a part of the wall portion provided around the irradiation axis with respect to the storage portion, from outside the storage portion with the irradiation axis as a reference. The storage part is cooled. At this time, by making the cooling medium flow through the second flow path, pass through the wall portion provided around the irradiation axis, and discharge heat from the storage part from the inside to the outside with the irradiation axis as a reference, the target in the storage part can be cooled. cool down. In this way, the target can be cooled from different directions by the first flow path and the second flow path. Therefore, the cooling efficiency of the target can be improved, whereby the efficiency of the nuclear reaction of the target can be improved.

The second flow path may be configured to be capable of cooling a portion of the storage section that can accommodate the liquid target. At this time, the second flow path cools the liquid target that has become high in temperature due to the irradiation of the particle beam, whereby evaporation of the liquid target can be suppressed. Therefore, the efficiency of the nuclear reaction of the liquid target can be improved.

The second flow path may be configured to be capable of cooling a portion of the storage section that can accommodate the gas target. At this time, the gas target can be liquefied by cooling the second flow path. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target.

It can be configured that the storage unit has: a first storage portion capable of storing a liquid target; and a second storage portion communicating with the first storage portion and capable of storing a gas target, and the second flow path can be separated from the irradiation axis via the second storage portion. The side opposite to the first flow path cools the housing portion. At this time, the liquid target in the first storage part is irradiated with the particle beam, evaporates, and is stored in the second storage part as a gas target. In contrast, the first flow path and the second flow path can cool the gas target from both sides with respect to the irradiation axis. Thereby, by cooling and liquefying a gas target, it can return to a 1st storage part as a liquid target. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target.

It may be configured such that a member that hinders the flow of the cooling medium is provided in the second flow path. At this time, the member blocks the flow of the cooling medium in the second flow path to change the laminar flow into a turbulent flow, thereby improving the cooling efficiency.

A target storage device according to an aspect of the present invention stores a target capable of producing a radioisotope through a nuclear reaction by irradiating a particle beam, and includes: a storage unit for storing the target; When the target is irradiated with a particle beam, the storage part is cooled from one side of the irradiation axis of the particle beam; At least a part of the storage portion is cooled from the outer peripheral side of the wall portion.

The target storage device includes a first flow channel through which a cooling medium can flow to cool the storage unit from the side of the irradiation axis of the particle beam. Thereby, by making the cooling medium flow through the first flow path, it is possible to cool the target in the storage unit from one side of the irradiation axis. Furthermore, the target storage device is provided with a second flow path, which allows the cooling medium to flow through at least a part of the wall portion provided around the irradiation axis with respect to the storage portion, from outside the storage portion with the irradiation axis as a reference. The storage part is cooled. At this time, by passing the cooling medium through the second flow path, the target in the storage unit can be cooled from the outer peripheral side through the wall portion provided around the irradiation axis. In this way, the target can be cooled from different directions by the first flow path and the second flow path. Therefore, the cooling efficiency of the target can be improved. [Effect of Invention]

According to the present invention, it is possible to provide a target storage device capable of improving cooling efficiency and an RI manufacturing device capable of improving nuclear reaction efficiency.

Hereinafter, referring to drawings, the form for carrying out this invention is demonstrated in detail. In addition, in the description of the drawings, the same reference numerals are attached to the same elements, and overlapping descriptions are omitted.

FIG. 1 is a cross-sectional view of an RI manufacturing apparatus 1 . The RI manufacturing apparatus 1 is equipped with the target storage apparatus 10 which is an embodiment of the RI manufacturing apparatus of this invention. The RI production device 1 is for producing 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 to manufacture radiopharmaceuticals (including radiopharmaceuticals) which are radioisotope-labeled compounds (RI compounds), for example. Examples of radioactive isotope-labeled compounds used in PET examinations (positron emission tomography examinations) in hospitals and the like include ¹⁸ F-FLT (fluorothymidine), ¹⁸ F-FMISO (flumisonidazole), and ¹¹ C-thyroxine. Clopride (Raclopride) and the like.

The RI manufacturing apparatus 1 is a so-called self-shield type particle accelerator system, and includes an accelerator (cyclotron) 2 for accelerating charged particles and a radiation shield (wall) for shielding the accelerator 2 to shield radiation, that is, a self-shield. 6. In the internal space S surrounded by the self-shielding body 6, in addition to the accelerator 2, a target storage device 10 for manufacturing RI, a vacuum pump 4 for vacuuming the interior of the accelerator 2, and the like are disposed. Furthermore, accessories necessary for the operation of the accelerator 2, accessories for cooling the target storage device 10, and the like are arranged in the internal space.

The accelerator 2 is a so-called vertical cyclotron, and has a pair of magnetic poles, a vacuum box, and an annular yoke surrounding the pair of magnetic poles and the vacuum box. A part of the pair of magnetic poles faces each other in the vacuum box with the upper surfaces separated by a predetermined interval. In the gap between the pair of magnetic poles, charged particles such as hydrogen ions are accelerated multiple times. The vacuum pump 4 is used to maintain the vacuum environment in the accelerator 2 , and is fixed on the side of the accelerator 2 , for example. The accelerator 2 emits a beam of charged particles in the irradiation direction indicated by arrow B in the figure.

The target storage device 10 receives the charged particle beam irradiated from the accelerator 2 to manufacture RI, and has a storage section for storing raw materials (for example, target water; ¹⁸ O water) inside. As shown in FIGS. 1 and 2 , the target storage device 10 is usually fixed to the side of the accelerator 2 . The RI manufacturing apparatus 1 of the present embodiment includes two target storage devices 10 disposed on both sides of the accelerator 2 . For example, the target storage device 10 arranged on the left side of the drawing is arranged on the upper side, and the target storage device 10 arranged on the right side of the drawing is arranged on the lower side (see FIG. 2 ). The target storage device 10 is covered by the target shield 7 provided in the accelerator 2 . The self-shielding body 6 is composed of a plurality of parts and is formed to cover the accelerator 2 and the target storage device 10 .

Next, referring to FIG. 3 and FIG. 4 , the above-mentioned target storage device 10 included in the RI manufacturing apparatus 1 of the present invention will be described in more detail. Fig. 3 is a cross-sectional view of the target storage device 10 of 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 cutaway perspective view of a part of the target storage device 10 . Refer primarily to FIG. 3 , and to FIG. 4 as appropriate.

As shown in FIG. 3 , the target storage device 10 of the present embodiment includes the foil 2 , the storage unit 3 , and cooling mechanisms 4A, 4B. The radioisotope manufacturing apparatus includes the aforementioned target storage device 10 and an accelerator not shown. As an accelerator, for example, a cyclotron or the like is used, which generates a charged particle beam (hereinafter referred to as “particle beam”), and the generated particle beam B is irradiated to the target storage device 10 along the irradiation axis RL. As the particle beam B irradiated to the target storage device 10 , for example, particle beams such as proton beams and deuteron beams can be mentioned. The target storage device 10 is attached to the outlet of the particle beam B leading out of the accelerator through a manifold (not shown) arranged between it and the accelerator. In addition, 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 on which 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. side. Moreover, the direction orthogonal to the depth direction D1 of the target storage apparatus 10, and the up-down direction may be called width direction D2.

In addition, when describing the positional relationship, the terms "outside" and "inside" based on the irradiation axis RL may be used. The outer side with respect to the irradiation axis RL is the side farther away from the irradiation axis RL in the direction perpendicular to the irradiation axis RL. The outer side with respect to the irradiation axis RL may be simply referred to as "outer peripheral side". The inner side with respect to the irradiation axis RL is the side closer to the irradiation axis RL in the direction perpendicular to the irradiation axis RL. The inner side with respect to the irradiation axis RL may be simply referred to as "inner peripheral side".

The target storage device 10 has, for example, a cylindrical outer shape. The target storage device 10 includes a target container 12 mainly for forming the storage unit 3 , a cooling mechanism forming member 13 mainly for forming the cooling mechanism 4A, and an inner ring 14 and an outer ring 15 mainly for forming the cooling mechanism 4B. The front flange 11, the target container 12, and the cooling mechanism forming member 13 are constituted by a metal block. Moreover, the front surface flange 11, the target container 12, and the cooling mechanism forming member 13 are overlapped sequentially from the front side toward the rear side in the depth direction D1.

The foil 2 is a member that partitions the storage portion 3 on the front side. The foil 2 is placed on the target container 12 . The foil 2 allows the particle beam B to pass, but blocks the liquid target 101 , He gas, and other fluids from passing through. Therefore, after the particle beam B is irradiated to the foil 2 , it is irradiated to the liquid target 101 through the foil 2 . For example, He gas is blown onto the front surface of the foil 2 and used as a cooling gas for the foil 2 . The foil 2 is, for example, a thin foil formed of a metal such as Ti or an alloy, and has a thickness of about 10 μm to 50 μm. The foil 2 is arranged to cover at least the entire area of the receptacle 3 .

The storage unit 3 is a part for housing the liquid target 101 . The housing portion 3 is constituted by a space surrounded by a recess 22 formed in the target container 12 , a cavity 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 Nb, for example. ¹⁸ O (target water) was sealed in the storage part 3 as the liquid target 101 . The recessed part 22 is recessed from the front surface of the target container 12, for example, the fixing surface 12a for fixing the foil 2 toward the rear side in the depth direction D1. The concave portion 22 has a bottom surface 22a and a peripheral surface 22b extending from the outer peripheral edge of the bottom surface 22a toward the front side in the depth direction D1. The accommodating part 3 is circular when viewed from the depth direction D1 (see FIG. 4 ). The cavity portion 25 is a space extending obliquely upward from the upper end of the concave portion 22 . The cavity portion 25 is inclined to extend upward toward the rear side in the depth direction D1. The cavity portion 25 communicates with the upper end of the recessed portion 22 . The cavity portion 25 has a sector shape when viewed from the depth direction D1 (see FIG. 5 ).

A gas introduction hole (not shown) for introducing an inert gas (for example, He gas) into the storage portion 3 is formed in the target container 12 . The target container 12 is formed with a circulation hole 26 (see FIG. 4 ), which is used when the liquid target 101 is filled in the storage unit 3 and is used when the liquid target 101 in the storage unit 3 is discharged.

The storage unit 3 has a first storage part E1 for storing the liquid target 101 ; and a second storage part E2 for receiving the gas target evaporated from the boiling liquid target 101 and located above the first storage part E1 . The second storage portion E2 is continuously formed above the first storage portion E1. Here, the space formed by the recessed part 22 corresponds to the 1st storage part E1, and the space formed by the cavity part 25 corresponds to the 2nd storage part E2.

The cooling mechanism 4A cools the housing part 3 with a cooling medium on the side opposite to the irradiation direction of the particle beam B irradiated on the liquid target 101 (that is, the rear side). 4 A of cooling mechanisms are equipped with the 1st cooling part 30A which cools the 1st storage part E1, and the 2nd cooling part 30B which cools the 2nd storage part E2. 30 A of 1st cooling parts are provided with the nozzle part 32A arrange|positioned in 31 A of 1st internal spaces (1st flow path). Moreover, the 2nd cooling part 30B is provided with the nozzle part 32B arrange|positioned in the 2nd internal space 31B (1st flow path).

The first internal space 31A and the second internal space 31B are spaces for a cooling medium to flow inside. The first internal space 31A and the second internal space 31B are constituted by the space between the target container 12 and the cooling mechanism forming member 13 by attaching the cooling mechanism forming member 13 to the concave portion 30 on the rear side of the target container 12 . The first internal space 31A is formed on the rear side in the depth direction D1 with respect to the first storage portion E1 of the storage unit 3 . The second internal space 31B is formed on the rear side in the depth direction D1 with respect to the second storage portion E2 of the storage unit 3 . That is, the second internal space 31B is provided above the first internal space 31A. The heat transfer wall part 34A is provided between the internal space 31A and the 1st accommodation part E1. The heat transfer wall part 34B is provided between the internal space 31B and the 2nd storage part E2. Also, the first internal space 31A and the second internal space 31B are partitioned from each other by a partition wall 36 .

1st nozzle part 32A is a member which sprays a cooling medium to 34 A of heat transfer wall parts between it and 1st storage part E1. The first nozzle portion 32A sprays the cooling medium vertically to the heat transfer wall portion 34 . The first nozzle portion 32A is separated from the heat transfer wall portion 34 . The 2nd nozzle part 32B is a member which sprays a cooling medium to the heat transfer wall part 34B between it and the 2nd storage part E2. The second nozzle portion 32B sprays the cooling medium vertically with respect to the heat transfer wall portion 34B. The second nozzle portion 32B is separated 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 housing portion 3 around the irradiation axis RL. Therefore, in the target container 12, the annular recessed part 40 is formed so that the inner ring 14 can be attached from the outer peripheral side (refer especially to FIG. 4). In addition, the inner ring 14 has a half structure divided into semicircular members 14A and 14B, and is attached to the recess 40 from the outer peripheral side (see FIG. 5 ). The inner ring 14 is in the shape of a ring having a substantially square cross section. However, at a portion corresponding to the cavity portion 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 peripheral side (see FIG. 4). The target container 12 is formed with a seating surface 40 a facing the inner ring 14 on the rear side. The outer ring 15 is attached to the seat surface 40a so as to support the inner ring 14 attached to the concave portion 40 from the outer peripheral side.

The target container 12 has a wall portion facing the inner peripheral surface 14 a of the inner ring 14 at the position of the recessed portion 22 of the housing portion 3 . This wall part is comprised as the heat transfer wall part 41 formed around the irradiation axis RL of the 1st storage part E1. The heat transfer wall portion 41 is formed as a cylindrical thin portion. Moreover, the target container 12 has a wall portion facing the inclined surface 14 b of the inner ring 14 at the position of the cavity portion 25 . This wall part is comprised as the heat transfer wall part 42 formed around the irradiation axis RL of the 2nd storage part E2. The heat transfer wall portion 41 is formed as a thin portion at a position facing the heat transfer wall portion 34B on the outer peripheral side. The heat transfer wall portion 42 is formed in a fan shape when viewed from the depth direction, and the heat transfer wall portion 41 is formed over the entire circumference except for the heat transfer wall portion 42 (see FIG. 5 ). Moreover, the step wall part 44 which stands up toward the heat transfer wall part 42 from the seat surface 40a is formed between the heat transfer wall part 41 and the heat transfer wall part 42 (refer FIG. 5).

A cooling flow path 46 (second flow path) for flowing a cooling medium is formed between the heat transfer wall portion 41 around the first housing portion E1 and the inner peripheral surface 14a of the inner ring 14 . The first storage part E1 of the storage part 3 is provided inside the heat transfer wall part 41 on the basis of the irradiation axis RL. Furthermore, the cooling flow path 46 is provided outside the heat transfer wall portion 41 with respect to the irradiation axis RL. Therefore, the cooling flow path 46 can allow the cooling medium to flow through the heat transfer wall portion 41 provided around the irradiation axis RL relative to the storage unit 3, and from the outer side of the first storage portion E1 of the storage unit 3 with the radiation axis RL as a reference. The first storage portion E1 of the storage unit 3 is cooled. The cooling flow path 46 allows the cooling medium to flow through the heat transfer wall part 41 provided around the irradiation axis RL relative to the storage part 3, and conducts heat transfer to the first storage part E1 of the storage part 3 from the outer peripheral side of the heat transfer wall part 41. cool down. The cooling flow path 46 can cool the first storage portion E1 in the storage unit 3 in which the liquid target 101 can be stored. With such a configuration, the cooling flow path 46 allows the cooling medium to flow through the heat transfer wall portion 41 to discharge 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.

A cooling flow path 48 (second flow path) for flowing a cooling medium is formed between the heat transfer wall portion 42 around the second housing portion E2 and the inclined surface 14b of the inner ring 14 . The second storage portion E2 of the storage unit 3 is provided on the inner side of the heat transfer wall portion 42 on the basis of the irradiation axis RL. Moreover, the cooling flow path 48 is provided outside the heat transfer wall portion 42 with respect to the irradiation axis RL. Therefore, the cooling flow path 48 can allow the cooling medium to flow through the heat transfer wall portion 42 provided around the irradiation axis RL with respect to the accommodation portion 3, and from the outer side of the second storage portion E2 of the storage portion 3 with the irradiation axis RL as a reference. The second storage portion E2 of the storage unit 3 is cooled. The cooling flow path 48 allows the cooling medium to flow through the heat transfer wall part 42 provided around the irradiation axis RL relative to the storage part 3, and conducts heat transfer to the second storage part E2 of the storage part 3 from the outer peripheral side of the heat transfer wall part 42. cool down. The cooling flow path 48 can cool the second storage portion E2 in the storage unit 3 where the gas target 102 can be stored. The cooling flow path 48 can cool the second storage part E2 of the storage part 3 from the side opposite to the internal space 31B of the irradiation axis RL via the second storage part E2 . According to such a structure, the cooling flow path 48 allows the cooling medium to flow through the heat transfer wall portion 42 to discharge heat from the second storage portion E2 of the storage portion 3 from the inside to the outside on the basis of the radiation axis RL. In addition, the second internal space 31B can allow the cooling medium to circulate, and pass through the heat transfer wall portion 34B provided around the irradiation axis RL with respect to the housing portion 3, and from the second storage portion E2 of the housing portion 3 on the basis of the radiation axis RL The inside cools the second storage portion E2 of the storage unit 3 . The second internal space 31B allows the cooling medium to flow, and through the heat transfer wall portion 34B, heat is released from the second storage portion E2 of the storage unit 3 from the outside to the inside based on the irradiation axis RL.

In addition, a flow path 47 communicating with the cooling flow path 46 is formed between the seat surface 40 a and the inner ring 14 . The flow path 47 communicates with 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 .

Next, the flow of the cooling medium to the cooling channels 46 and 48 will be described with reference to FIGS. 3 and 5 . In addition, the supply pipe 51 and the discharge pipe 52 are provided in a region near the lower end of the seat surface 40a. Furthermore, a partition wall 54 that blocks the flow of the cooling medium is provided between the supply pipe 51 and the discharge pipe 52 . First, the cooling medium supplied from the supply pipe 51 flows through the flow path 47 ( F1 ) and is supplied to the cooling flow path 46 . Thereby, a part of the cooling medium flows through the cooling flow path 46 (F2). In the stepped wall portion 44 , the cooling medium flows ( F3 ) over the stepped wall portion 44 and is supplied to the cooling flow path 48 . Thereby, the cooling medium flows through the cooling flow path 48 (F4). In the next step wall portion 44 , the cooling medium flows down the step wall portion 44 ( F5 ), and is supplied to the cooling flow path 46 and the flow path 47 . Thereby, the cooling medium flows through the cooling flow path 46 (F6), and then flows through the cooling flow path 47 (F7).

Next, the operation effect of the RI production apparatus 1 and the target storage apparatus 10 of this embodiment are demonstrated.

The RI manufacturing apparatus 1 includes internal spaces 31A, 31B through which a cooling medium can flow, and cools the storage unit 3 from the side (rear side) of the irradiation axis RL of the particle beam B. Thereby, the target of the storage part 3 can be cooled from the irradiation axis RL side by making a cooling medium flow into internal space 31A, 31B. Furthermore, the RI manufacturing apparatus 1 is equipped with cooling flow paths 46, 48 which allow the cooling medium to flow through the heat transfer wall portions 41, 42 provided around the irradiation axis RL with respect to the housing portion 3 to irradiate. The storage part 3 is cooled from the outside of the storage part 3 based on the axis RL. At this time, by making the cooling medium flow through the cooling channels 46, 48, passing through the heat transfer wall portions 41, 42 provided around the irradiation axis RL, the heat is released from the housing portion 3 from the inside to the outside with the irradiation axis RL as a reference. , thereby cooling the target in the storage unit 3 . In this way, the target can be cooled from different directions by the internal spaces 31A, 31B and the cooling channels 46 , 48 . Therefore, the cooling efficiency of the target can be improved, whereby the efficiency of the nuclear reaction of the target can be improved.

The cooling flow path 46 may be configured to be capable of cooling the first storage portion E1 in the storage unit 3 in which the liquid target 101 can be stored. At this time, the cooling channel 46 cools the liquid target 101 , which has become high in temperature due to the irradiation of the particle beam B, whereby evaporation of the liquid target 101 can be suppressed. Therefore, the efficiency of the nuclear reaction of the liquid target 101 can be improved.

The cooling flow path 48 may be configured to be able to cool the second storage portion E2 in the storage unit 3 in which the gas target 102 can be stored. At this time, the cooling channel 48 can cool the gas target 102 to be liquefied. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target 101 .

The storage unit 3 may be configured to include: a first storage portion E1 capable of storing the liquid target 101; and a second storage portion E2 communicating with the first storage portion E1 and capable of storing the gas target 102, and the cooling flow path 48 can accommodate the gas target 102 via the second storage portion E1. The housing part E2 cools the housing part 3 from the side opposite to the internal space 31B of the irradiation axis RL. At this time, the liquid target 101 in the first storage part E1 is irradiated with the particle beam B to be evaporated, and the gas target 102 is stored in the second storage part E2. In contrast, the internal space 31B and the cooling channel 48 can cool the gas target 102 from both sides with respect to the irradiation axis RL. Thereby, by cooling and liquefying the gas target 102, the liquid target 101 can be returned to the 1st storage part E1. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target 101 .

Furthermore, the target storage device 10 includes internal spaces 31A and 31B through which a cooling medium can flow and cools the storage unit 3 from the irradiation axis RL side (rear side) of the particle beam B. Thereby, the target of the storage part 3 can be cooled from the irradiation axis RL side by making a cooling medium flow into internal space 31A, 31B. Furthermore, the target storage device 10 is equipped with cooling flow paths 46, 48, and the cooling flow paths 46, 48 allow a cooling medium to flow through the heat transfer wall portions 41, 42 provided around the irradiation axis RL relative to the storage portion 3 to irradiate The storage part 3 is cooled from the outside of the storage part 3 based on the axis RL. At this time, by making the cooling medium flow through the cooling channels 46, 48, passing through the heat transfer wall portions 41, 42 provided around the irradiation axis RL, the heat is released from the housing portion 3 from the inside to the outside with the irradiation axis RL as a reference. , thereby cooling the target in the storage unit 3 . In this way, the target can be cooled from different directions by the internal spaces 31A, 31B and the cooling channels 46 , 48 . Therefore, the cooling efficiency of the target can be improved, whereby the efficiency of the nuclear reaction of the target can be improved. Therefore, the cooling efficiency of the target can be improved.

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

For example, a member that hinders the flow of the cooling medium may be provided in the cooling channels 46 and 48 . At this time, the member obstructs the flow of the cooling medium in the cooling channels 46 and 48 to change the laminar flow into a turbulent flow, thereby improving the cooling efficiency. For example, as shown in FIG. 6 , at least one of the inner peripheral surface 14 a of the inner ring 14 and the heat transfer wall portion 41 is provided with a member 60 that hinders the flow of the cooling medium. At this time, slits are formed in the cooling flow path 46 by the member 60 . The flow is hindered by such a slit structure, whereby the cooling medium becomes a turbulent flow.

The specific configurations of the RI production apparatus and the target storage apparatus of the present invention are not limited to the above-mentioned embodiments.

As for the cooling channels 46 and 48, at least one of them may be provided, and the other may be omitted.

1: RI manufacturing device 3: storage department 10: Target storage device 31A, 31B: Internal space (1st channel) 41,42: heat transfer wall 46,48: Cooling flow path (2nd flow path)

[ Fig. 1 ] is a cross-sectional view of an RI manufacturing apparatus according to an embodiment of the present invention. [FIG. 2] It is a top view of the RI manufacturing apparatus. [ Fig. 3 ] is a cross-sectional view of a target storage device according to this embodiment. [Fig. 4] It is a perspective view of the target storage device. [FIG. 5] It is a figure explaining the flow of the cooling medium of a target accommodation apparatus. [ Fig. 6 ] An enlarged view of a cooling flow path.

2: Foil

3: storage department

4A: cooling mechanism

4B: cooling mechanism

10: Target storage device

12: Target container

12a: Fixed surface

13: The cooling mechanism forms a component

14: inner ring

14a: inner peripheral surface

14b: Inclined surface

15: outer ring

22: Concave

22a: bottom surface

22b: Perimeter

25: cavity part

30: Concave

30A: 1st cooling unit

30B: The second cooling section

31A, 31B: inner space

32A: Nozzle part

32B: nozzle part

34A: heat transfer wall

34B: heat transfer wall

36: Partition wall

40: concave part

40a: seat surface

41,42: heat transfer wall

46,48: cooling flow path

47: flow path

51: supply pipe

52: discharge pipe

101: Liquid target

102: Gas target

B: particle beam

D1: Depth direction

D2: Width direction

E1: The first storage part

E2: The second storage part

RL: irradiation axis

Claims (6)

An RI manufacturing apparatus for producing radioisotopes by nuclear reactions of targets irradiated with particle beams, which has: a storage unit for storing the target at the irradiation position of the particle beam; The first flow path is capable of circulating a cooling medium to cool the housing portion from one side of the irradiation axis of the particle beam; and The second flow path is capable of passing a cooling medium through at least a part of a wall portion provided around the irradiation axis relative to the storage portion, and cooling the storage portion from outside the storage portion with the radiation axis as a reference. The RI manufacturing device according to claim 1, wherein, The second flow path can cool a portion of the storage section that can accommodate a liquid target. The RI manufacturing device according to claim 1 or claim 2, wherein, The said 2nd flow path can cool the part in the said accommodation part which can accommodate a gas target. The RI manufacturing device according to claim 1 or claim 2, wherein, The storage unit has: a first storage part capable of storing a liquid target; and a second storage part communicating with the first storage part and capable of storing a gas target, The second flow path can cool the storage portion from a side of the irradiation axis opposite to the first flow path via the second storage portion. The RI manufacturing device according to claim 1 or claim 2, wherein, A member obstructing the flow of the cooling medium is provided in the second flow path. A target storage device for storing targets capable of producing radioisotopes through nuclear reactions by irradiating particle beams, comprising: The storage part stores the aforementioned target; The first flow path is capable of circulating a cooling medium, and cools the housing portion from one side of the irradiation axis of the particle beam when the target is irradiated with the particle beam; and The second flow path is capable of passing a cooling medium through at least a part of a wall portion provided around the irradiation axis relative to the storage portion, and cooling the storage portion from outside the storage portion with the radiation axis as a reference.

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