CN115132394B

CN115132394B - RI manufacturing device and target storage device

Info

Publication number: CN115132394B
Application number: CN202210318662.8A
Authority: CN
Inventors: 上田隆正
Original assignee: Sumitomo Heavy Industries Ltd
Current assignee: Sumitomo Heavy Industries Ltd
Priority date: 2021-03-29
Filing date: 2022-03-29
Publication date: 2025-09-26
Anticipated expiration: 2042-03-29
Also published as: TW202238625A; TWI818484B; KR20220135192A; JP2022152583A; CN115132394A; JP7598278B2

Abstract

The present invention relates to an RI manufacturing apparatus and a target accommodating apparatus, which can provide a target accommodating apparatus capable of improving cooling efficiency and an RI manufacturing apparatus capable of improving nuclear reaction efficiency. The RI manufacturing apparatus (1) is provided with cooling flow paths (46, 48), wherein the cooling flow paths (46, 48) can be used for cooling a cooling medium to enable the cooling medium to flow, so that the accommodating part (3) is cooled from the outer periphery side of the heat transfer wall parts (41, 42) through the heat transfer wall parts (41, 42) which are arranged around an irradiation axis (RL) relative to the accommodating part (3). At this time, by flowing a cooling medium through the cooling flow paths (46, 48), the target in the housing part (3) can be cooled from a position outside the housing part with respect to the irradiation axis via the heat transfer wall parts (41, 42) surrounding the irradiation axis (RL). Thus, the targets can be cooled from different directions by the internal spaces (31A, 31B) and the cooling channels (46, 48).

Description

RI manufacturing apparatus and target housing apparatus

Technical Field

The present application claims priority based on japanese patent application No. 2021-055409 filed on day 29 of 3 of 2021. The entire contents of this japanese application are incorporated by reference into the present specification.

The present invention relates to a target accommodating device.

Background

The radioisotope used in the medicine for PET examination using positron emission tomography (PET: positron Emission Tomography) is produced by using a radiation source such as a cyclotron provided at a position close to an examination room in a hospital. Specifically, a particle beam (e.g., a proton beam, a deuteron beam, or the like) from a radiation source is directed to a target accommodating device, and a radioisotope is produced by nuclear reaction with a target (e.g., target water (¹⁸ O water)) accommodated in the target accommodating device. The prepared radioisotope is then added to a predetermined compound (for example, fluorodeoxyglucose (FDG)), or a part thereof is replaced and synthesized to prepare an inspection reagent.

As an RI production apparatus for producing such a radioisotope, there is known an apparatus provided with a housing portion for housing a liquid target and a flow path for cooling the housing portion from one side of an irradiation axis of a particle beam (for example, refer to patent document 1).

Patent document 1 Japanese patent application laid-open No. 2013-246131

Here, the target is at a high temperature by the irradiation of the particle beam. In contrast, by improving the cooling efficiency of the cooling target, the efficiency of the nuclear reaction can be improved. Therefore, there is a need for a target housing device capable of improving cooling efficiency and an RI manufacturing device capable of improving the efficiency of nuclear reaction.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a target housing device capable of improving cooling efficiency and an RI manufacturing device capable of improving efficiency of nuclear reaction.

In order to achieve the above object, an RI manufacturing apparatus according to an aspect of the present invention is an RI manufacturing apparatus for manufacturing a radioisotope by nuclear reaction of a target irradiated with a particle beam, the RI manufacturing apparatus including a housing portion for housing the target at an irradiation position of the particle beam, a1 st flow path through which a cooling medium can flow so as to cool the housing portion from one side with respect to an irradiation axis of the particle beam, and a2 nd flow path through which the cooling medium can flow so as to cool the housing portion from a position further outside than the housing portion with respect to the irradiation axis through at least a portion of a wall portion provided around the irradiation axis with respect to the housing portion.

The RI manufacturing apparatus includes a 1 st flow path through which a cooling medium can flow so as to cool the accommodating portion from a side opposite to the irradiation axis of the particle beam. Thus, the target in the housing portion can be cooled from the side opposite to the irradiation axis by flowing the cooling medium through the 1 st flow path. The RI manufacturing apparatus further includes a 2 nd flow path through which the cooling medium can flow so as to cool the housing portion from a position further outside than the housing portion with reference to the irradiation axis via at least a part of a wall portion provided around the irradiation axis with respect to the housing portion. At this time, the cooling medium is caused to flow through the 2 nd flow path, whereby heat is discharged from the accommodating portion from the inside to the outside with reference to the irradiation axis via the wall portion surrounding the irradiation axis, and thereby the target in the accommodating portion can be cooled. Thus, the target can be cooled from different directions through the 1 st flow path and the 2 nd flow path. Therefore, the cooling efficiency of the target can be improved, and thus the efficiency of the nuclear reaction of the target can be improved.

The 2 nd flow path may cool a portion of the accommodating portion capable of accommodating the liquid target. In this case, the 2 nd flow path cools the liquid target which is heated by the irradiated particle beam, and thus can suppress evaporation of the liquid target. Therefore, the efficiency of the nuclear reaction of the liquid target can be improved.

The 2 nd flow path may cool a portion of the accommodating portion capable of accommodating the gas target. In this case, the 2 nd flow path cools the gas target, and can liquefy the gas target. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target.

The housing part may include a 1 st housing part capable of housing the liquid target, and a 2 nd housing part which communicates with the 1 st housing part and is capable of housing the gas target, and the 2 nd flow path may cool the housing part from a side opposite to the 1 st flow path with respect to the irradiation axis through the 2 nd housing part. At this time, the liquid target in the 1 st accommodation portion is vaporized by the irradiated particle beam, and is stored in the 2 nd accommodation portion as a gas target. In contrast, the 1 st flow path and the 2 nd flow path can cool the gas target from both sides with respect to the irradiation axis. This can liquefy the gas target by cooling it, and return it to the 1 st accommodation portion as a liquid target. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target.

The flow passage 2 may be provided with a member that blocks the flow of the cooling medium. In this case, the flow of the cooling medium in the 2 nd flow path is blocked by the member, and thus the laminar flow can be replaced with the turbulent flow, and the cooling efficiency can be improved.

The target housing device according to an aspect of the present invention is a target housing device for housing a target capable of producing a radioisotope by nuclear reaction by irradiation with a particle beam, and comprises a housing portion for housing the target, a1 st flow path through which a cooling medium can flow so as to cool the housing portion from a side opposite to an irradiation axis of the particle beam when the target is irradiated with the particle beam, and a2 nd flow path through which the cooling medium can flow so as to cool the housing portion from an outer peripheral side of a wall portion provided around the irradiation axis with respect to the housing portion via at least a part of the wall portion.

The target housing device includes a1 st flow path through which a cooling medium can flow so as to cool the housing portion from a side opposite to the irradiation axis of the particle beam. By passing the cooling medium through the 1 st flow path, the target in the housing can be cooled from the side opposite to the irradiation axis. The target housing device is provided with a 2 nd flow path through which a cooling medium can flow, so that the housing portion is cooled from a position outside the housing portion with reference to the irradiation axis via at least a part of a wall portion provided around the irradiation axis with respect to the housing portion. In this case, the cooling medium flows through the 2 nd flow path, whereby the target in the housing portion can be cooled from the outer peripheral side via the wall portion surrounding the irradiation axis. Thus, the target can be cooled from different directions through the 1 st flow path and the 2 nd flow path. Therefore, the cooling efficiency of the target can be improved.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a target housing device capable of improving cooling efficiency and an RI manufacturing device capable of improving efficiency of nuclear reaction can be provided.

Drawings

Fig. 1 is a cross-sectional view of an RI manufacturing apparatus according to an embodiment of the present invention.

Fig. 2 is a top view of the RI fabrication apparatus.

Fig. 3 is a cross-sectional view of the target accommodating device according to the present embodiment.

Fig. 4 is a perspective view of the target accommodating apparatus.

Fig. 5 is a diagram illustrating a flow of a cooling medium of the target accommodating apparatus.

Fig. 6 is an enlarged view of the cooling flow path.

Description of symbols

1-RL manufacturing apparatus, 3-housing portion, 10-target housing portion, 31A, 31B-internal space (1 st flow path), 41, 42-heat transfer wall portion, 46, 48-cooling flow path (2 nd flow path).

Detailed Description

Hereinafter, modes for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repetitive description thereof will be omitted.

Fig. 1 is a sectional view of an RI manufacturing apparatus 1. The RI manufacturing apparatus 1 includes a target housing apparatus 10 as an embodiment of the RI manufacturing apparatus of the present invention. The RI manufacturing apparatus 1 manufactures a Radioisotope (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 radiopharmaceutical products) as radioisotope-labeled compounds (RI compounds). Examples of radioisotope-labeled compounds used in PET examinations (positron emission tomography examinations) in hospitals and the like include ¹⁸ F-FLT (fluorothymidine), ¹⁸ F-FMISO (fluorometholazote), ¹¹ C-ramipril, and the like.

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

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 is opposed to each other with a predetermined interval in the upper surface of the vacuum box. In the gap between these pairs of magnetic poles, charged particles such as hydrogen ions are multiply accelerated. The vacuum pump 4 is used to maintain a vacuum environment within the accelerator 2, for example, fixed to the side of the accelerator 2. The accelerator 2 emits a charged particle beam in an irradiation direction indicated by an arrow B in the figure.

The target housing device 10 receives the charged particle beam irradiated from the accelerator 2 to manufacture RI, and has a housing portion for housing a raw material (e.g., target water; ¹⁸ O water) formed therein. As shown in fig. 1 and 2, the target housing device 10 is generally fixed to a side portion of the accelerator 2. The RI manufacturing apparatus 1 of the present embodiment is provided with 2 target accommodating apparatuses 10 disposed on both sides with an accelerator 2 interposed therebetween. For example, the target housing device 10 disposed on the left side of the drawing is disposed on the upper layer side, and the target housing device 10 disposed on the right side of the drawing is disposed on the lower layer side (refer to fig. 2). The target accommodating device 10 is covered with a target shield 7 provided to 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 accommodating device 10.

Next, the target housing device 10 provided in the RI manufacturing apparatus 1 of the present invention will be described in further detail with reference to fig. 3 and 4. Fig. 3 is a cross-sectional view of the target housing device 10 according to the present embodiment. Fig. 3 is a cross-sectional view of the target housing 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 accommodating apparatus 10 cut. Referring primarily to fig. 3, reference is suitably made to fig. 4.

As shown in fig. 3, the target housing device 10 according to the present embodiment includes a foil, a housing portion 3, and cooling mechanisms 4A and 4B. The radioisotope manufacturing apparatus includes the target housing apparatus 10 and an accelerator not shown. As the 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 housing device 10 along the irradiation axis RL. The particle beam B irradiated to the target housing device 10 includes, for example, a particle beam such as a proton beam or deuteron beam. The target accommodating device 10 is mounted to an outlet port from which the particle beam B of the accelerator is led out via a manifold (not shown) disposed between the target accommodating device and the accelerator. In the following description, the direction in which the irradiation axis RL extends may be referred to as the longitudinal direction D1 of the target accommodating device 10. The side on which the particle beam B is irradiated in the longitudinal direction D1 (upstream side in the traveling direction of the particle beam) may be referred to as the front side of the target accommodating apparatus 10, and the opposite side may be referred to as the rear side of the target accommodating apparatus 10. The direction orthogonal to the longitudinal direction D1 and the up-down direction of the target accommodating device 10 may be referred to as the width direction D2.

In the description of the positional relationship, terms such as "outside" and "inside" with respect to the irradiation axis RL may be used. The outer side with respect to the irradiation axis RL is a side distant from the irradiation axis RL in a direction orthogonal 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 a side closer to the irradiation axis RL in the direction orthogonal 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 housing device 10 has, for example, a cylindrical shape. The target housing device 10 includes a target container 12 mainly for forming the housing portion 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 surface flange 11, the target container 12, and the cooling mechanism forming member 13 are formed of a metal block. The front flange 11, the target container 12, and the cooling mechanism forming member 13 are sequentially overlapped from the front side toward the rear side in the longitudinal direction D1.

The foil is a part separating the accommodation part 3 at the front side. The foil is disposed in the target container 12. The foil allows the particle beam B to pass therethrough, and on the other hand, blocks the liquid target 101, he gas, or the like from passing therethrough. Therefore, after the particle beam B is irradiated to the foil, it passes through the foil and is irradiated to the liquid target 101. For example, he gas is blown onto the front surface of the foil to be used as a cooling gas for the foil. The foil is a thin foil made of a metal or alloy such as Ti, for example, and has a thickness of about 10 μm to 50 μm. The foil is arranged to cover at least the whole area of the receiving portion 3.

The housing 3 is a portion that houses 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 25 formed in the target container 12 and communicating with the recess 22, and a foil. The target container 12 can be formed of Nb, for example. ¹⁸ O (target water) is enclosed in the housing portion 3 as a liquid target 101. The recess 22 is recessed from the front surface of the target container 12, for example, the fixing surface 12a of the fixing foil, toward the rear side in the longitudinal direction D1. The recess 22 has a bottom surface 22a and a peripheral surface 22b extending from an outer peripheral edge of the bottom surface 22a to a front side in the longitudinal direction D1. The housing portion 3 is circular when viewed in the longitudinal direction D1 (see fig. 4). The cavity 25 is a space extending obliquely upward from the upper end of the recess 22. The cavity portion 25 is inclined to extend upward toward the rear side in the longitudinal direction D1. The cavity 25 communicates with the upper end of the recess 22. The cavity 25 has a fan shape when viewed from the longitudinal direction D1 (see fig. 5).

A gas introduction hole (not shown) for introducing an inert gas (e.g., he gas) into the accommodating portion 3 is formed in the target container 12. The target container 12 is formed with a flow hole 26 (see fig. 4), and the flow hole 26 is used when filling the liquid target 101 in the storage portion 3 and is used when discharging the liquid target 101 in the storage portion 3.

The housing part 3 has a1 st housing part E1 for housing the liquid target 101, and a2 nd housing part E2 which is located above the 1 st housing part E1 and receives a gas target in which the boiled liquid target 101 is evaporated. The 2 nd receiving portion E2 is continuously formed at an upper side of the 1 st receiving portion E1. Here, the space formed by the recess 22 corresponds to the 1 st accommodation portion E1, and the space formed by the cavity 25 corresponds to the 2 nd accommodation portion E2.

The cooling mechanism 4A cools the housing portion 3 with a cooling medium on the side opposite to the irradiation direction (i.e., the rear surface side) of the particle beam B irradiated to the liquid target 101. The cooling mechanism 4A includes a1 st cooling portion 30A that cools the 1 st housing portion E1 and a2 nd cooling portion 30B that cools the 2 nd housing portion E2. The 1 st cooling portion 30A includes a1 st nozzle portion 32A disposed in the 1 st internal space 31A (1 st flow path). The 2 nd cooling portion 30B includes a2 nd nozzle portion 32B disposed in the 2 nd internal space 31B (1 st flow path).

The 1 st internal space 31A and the 2 nd internal space 31B are spaces for flowing the cooling medium therein. The 1 st and 2 nd internal spaces 31A and 31B are constituted by the space between the target container 12 and the cooling mechanism forming member 13 by mounting the cooling mechanism forming member 13 in the recess 30 on the rear side of the target container 12. The 1 st internal space 31A is formed on the rear side in the longitudinal direction D1 with respect to the 1 st accommodation portion E1 of the accommodation portion 3. The 2 nd internal space 31B is formed on the rear side in the longitudinal direction D1 with respect to the 2 nd accommodation portion E2 of the accommodation portion 3. That is, the 2 nd internal space 31B is provided above the 1 st internal space 31A. A heat transfer wall portion 34A is provided between the 1 st internal space 31A and the 1 st accommodation portion E1. A heat transfer wall portion 34B is provided between the 2 nd internal space 31B and the 2 nd accommodation portion E2. Further, the 1 st internal space 31A and the 2 nd internal space 31B are partitioned from each other by a partition plate 36.

The 1 st nozzle portion 32A is a member that sprays a cooling medium to the heat transfer wall portion 34A between it and the 1 st accommodation portion E1. The 1 st nozzle portion 32A sprays the cooling medium perpendicularly to the heat transfer wall portion 34. The 1 st nozzle portion 32A is separated from the heat transfer wall portion 34. The 2 nd nozzle portion 32B is a member that sprays a cooling medium to the heat transfer wall portion 34B between it and the 2 nd accommodating portion E2. The 2 nd nozzle portion 32B sprays the cooling medium perpendicularly with respect to the heat transfer wall portion 34B. The 2 nd 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. Accordingly, an annular recess 40 (see fig. 4 in particular) is formed in the target container 12 so that the inner ring 14 can be attached from the outer peripheral side. The inner ring 14 has a half-divided structure of semicircular members 14A and 14B, and is fitted into the recess 40 from the outer peripheral side (see fig. 5). The inner ring 14 has a circular ring shape with a substantially quadrangular 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). A support surface 40a is formed in the target container 12 so as to face the inner ring 14 on the rear side. The outer ring 15 is attached to the support surface 40a so as to support the inner ring 14 attached to the recess 40 from the outer peripheral side.

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 accommodating portion 3. The wall portion is configured as a heat transfer wall portion 41 of the 1 st accommodation portion E1 formed around the irradiation axis RL. The heat transfer wall 41 is formed as a thin wall portion having a cylindrical shape. The target container 12 has a wall portion facing the inclined surface 14b of the inner ring 14 at the position of the cavity portion 25. The wall portion is configured as a heat transfer wall portion 42 of the 2 nd accommodation portion E2 formed around the irradiation axis RL. The heat transfer wall 41 is formed as a thin portion at a position facing the heat transfer wall 34B on the outer peripheral side. The heat transfer wall portion 42 is formed in a fan shape when viewed in the longitudinal direction, and the heat transfer wall portion 41 is formed on the entire periphery of the portion other than the heat transfer wall portion 42 (see fig. 5). Further, a stepped wall portion 44 (see fig. 5) is formed between the heat transfer wall portion 41 and the heat transfer wall portion 42, which rises from the support surface 40a toward the heat transfer wall portion 42.

A cooling flow path 46 (a 2 nd flow path) for flowing a cooling medium is formed between the heat transfer wall portion 41 surrounding the 1 st accommodation portion E1 and the inner peripheral surface 14a of the inner ring 14. The 1 st accommodation portion E1 of the accommodation portion 3 is provided on the inner side of the heat transfer wall portion 41 with respect to the irradiation axis RL. The cooling flow path 46 is provided on the outer side of the heat transfer wall 41 with respect to the irradiation axis RL. Therefore, the cooling flow path 46 can be configured to circulate a cooling medium so as to cool the 1 st housing portion E1 of the housing portion 3 from a position further outside than the 1 st housing portion E1 of the housing portion 3 with respect to the irradiation axis RL via the heat transfer wall portion 41 provided around the irradiation axis RL with respect to the housing portion 3. The cooling flow path 46 is configured to allow a cooling medium to circulate so as to cool the 1 st housing portion E1 of the housing portion 3 from the outer peripheral side of the heat transfer wall portion 41 via the heat transfer wall portion 41 provided around the irradiation axis RL with respect to the housing portion 3. The cooling flow path 46 can cool the 1 st housing portion E1 of the housing portion 3 that can house the liquid target 101. According to this configuration, the cooling flow path 46 can be configured to allow the cooling medium to circulate so as to discharge heat from the 1 st accommodation portion E1 of the accommodation portion 3 from the inside to the outside with respect to the irradiation axis RL via the heat transfer wall portion 41.

A cooling flow path 48 (a 2 nd flow path) for flowing the cooling medium is formed between the heat transfer wall portion 42 surrounding the 2 nd accommodation portion E2 and the inclined surface 14b of the inner ring 14. The 2 nd accommodation portion E2 of the accommodation portion 3 is provided on the inner side of the heat transfer wall portion 42 with respect to the irradiation axis RL. The cooling flow path 48 is provided on the outer side of the heat transfer wall 42 with respect to the irradiation axis RL. Therefore, the cooling flow path 48 can be configured to circulate a cooling medium so as to cool the 2 nd housing portion E2 of the housing portion 3 from a position further outside than the 2 nd housing portion E2 of the housing portion 3 with respect to the irradiation axis RL via the heat transfer wall portion 42 provided around the irradiation axis RL with respect to the housing portion 3. The cooling flow path 48 is configured to allow a cooling medium to circulate so as to cool the 2 nd housing portion E2 of the housing portion 3 from the outer peripheral side of the heat transfer wall portion 42 via the heat transfer wall portion 42 provided around the irradiation axis RL with respect to the housing portion 3. The cooling flow path 48 can cool the 2 nd housing portion E2 of the housing portion 3 that can house the gas target 102. The cooling flow path 48 can cool the 2 nd housing portion E2 of the housing portion 3 from the opposite side of the irradiation axis RL from the 2 nd internal space 31B across the 2 nd housing portion E2. According to this configuration, the cooling flow path 48 can be configured to allow the cooling medium to circulate so as to discharge heat from the 2 nd housing portion E2 of the housing portion 3 from the inside to the outside with respect to the irradiation axis RL via the heat transfer wall portion 42. The 2 nd internal space 31B is configured to allow a cooling medium to circulate so as to cool the 2 nd accommodation portion E2 of the accommodation portion 3 from a position further inward than the 2 nd accommodation portion E2 of the accommodation portion 3 with respect to the irradiation axis RL via a heat transfer wall portion 34B provided around the irradiation axis RL with respect to the accommodation portion 3. The 2 nd internal space 31B can be circulated with a cooling medium so that heat is discharged from the 2 nd accommodation portion E2 of the accommodation portion 3 from the outside to the inside with reference to the irradiation axis RL via the heat transfer wall portion 34B.

A flow path 47 communicating with the cooling flow path 46 is formed between the support surface 40a and the inner ring 14. The flow path 47 communicates with a supply pipe 51 and a discharge pipe 52 of the cooling medium. Therefore, the flow path 47 supplies and recovers the cooling medium to and from the cooling flow paths 46 and 48.

Next, the flow of the cooling medium through the cooling passages 46, 48 will be described with reference to fig. 3 and 5. The supply pipe 51 and the discharge pipe 52 are provided in a region near the lower end of the support surface 40 a. A separator 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) to be supplied to the cooling flow path 46. Thus, 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) so as to pass 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 44, the cooling medium flows down along the step wall 44 (F5) and is supplied to the cooling flow path 46 and the flow path 47. Thus, the cooling medium flows through the cooling flow path 46 (F6) and flows through the cooling flow path 47 (F7).

Next, the operational effects of the RI manufacturing apparatus 1 and the target housing apparatus 10 according to the present embodiment will be described.

The RI manufacturing apparatus 1 includes a 1 st internal space 31A and a 2 nd internal space 31B, and the 1 st internal space 31A and the 2 nd internal space 31B can be supplied with a cooling medium to cool the accommodating portion 3 from one side (rear side) with respect to the irradiation axis RL of the particle beam B. Accordingly, the target of the housing 3 can be cooled from the side opposite to the irradiation axis RL by flowing the cooling medium through the 1 st and 2 nd internal spaces 31A and 31B. The RI manufacturing apparatus 1 further includes cooling passages 46 and 48, and the cooling passages 46 and 48 are configured to allow a cooling medium to flow so as to cool the housing portion 3 from a position outside the housing portion 3 with respect to the irradiation axis RL via heat transfer wall portions 41 and 42 provided around the irradiation axis RL with respect to the housing portion 3. At this time, by flowing the cooling medium through the cooling flow paths 46, 48, heat is discharged from the housing 3 from the inside to the outside with respect to the irradiation axis RL via the heat transfer wall portions 41, 42 around the irradiation axis RL, whereby the target of the housing 3 can be cooled. In this way, the target can be cooled from different directions by the 1 st internal space 31A, the 2 nd internal space 31B, and the cooling channels 46, 48. Therefore, the cooling efficiency of the target can be improved, and thus the efficiency of the nuclear reaction of the target can be improved.

The cooling flow path 46 may cool the 1 st housing portion E1 of the housing portion 3 which can house the liquid target 101. At this time, the cooling flow path 46 cools the liquid target 101 that has been heated by the irradiation of the particle beam B, and thereby can suppress evaporation of the liquid target 101. Therefore, the efficiency of the nuclear reaction of the liquid target 101 can be improved.

The cooling flow path 48 may cool the 2 nd housing portion E2 of the housing portion 3 which can house the gas target 102. At this time, the cooling flow path 48 cools the gas target 102, thereby liquefying it. Therefore, the efficiency of the nuclear reaction can be improved by increasing the amount of the liquid target 101.

The housing portion 3 may include a 1 st housing portion E1 capable of housing the liquid target 101, and a 2 nd housing portion E2 capable of housing the gas target 102 in communication with the 1 st housing portion E1, and the cooling flow path 48 may cool the housing portion 3 from a side opposite to the 2 nd internal space 31B with respect to the irradiation axis RL through the 2 nd housing portion E2. At this time, the liquid target 101 of the 1 st accommodation portion E1 is vaporized by the irradiated particle beam B, and is stored as the gas target 102 in the 2 nd accommodation portion E2. In contrast, the 2 nd internal space 31B and the cooling flow path 48 can cool the gas target 102 from both sides with respect to the irradiation axis RL. Thereby, the gas target 102 can be liquefied by cooling it, and returned to the 1 st accommodation portion 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 housing device 10 includes a1 st internal space 31A and a2 nd internal space 31B, and the 1 st internal space 31A and the 2 nd internal space 31B can be supplied with a cooling medium so as to cool the housing portion 3 from one side (rear side) with respect to the irradiation axis RL of the particle beam B. By passing the cooling medium through the 1 st and 2 nd internal spaces 31A and 31B, the target in the housing 3 can be cooled from the side opposite to the irradiation axis RL. The target housing device 10 includes cooling passages 46 and 48, and the cooling passages 46 and 48 are configured to allow a cooling medium to flow so as to cool the housing portion 3 from a position outside the housing portion 3 with respect to the irradiation axis RL via heat transfer wall portions 41 and 42 provided around the irradiation axis RL with respect to the housing portion 3. At this time, by flowing the cooling medium through the cooling flow paths 46, 48, heat can be discharged from the housing 3 from the inside to the outside with respect to the irradiation axis RL via the heat transfer wall portions 41, 42 around the irradiation axis RL, thereby cooling the target of the housing 3. In this way, the target can be cooled from different directions by the 1 st internal space 31A, the 2 nd internal space 31B, and the cooling channels 46, 48. Therefore, the cooling efficiency of the target can be improved, and thus 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 embodiment.

For example, the cooling passages 46, 48 may be provided with a member that blocks the flow of the cooling medium. At this time, the flow of the cooling medium in the cooling flow paths 46, 48 is blocked by the member to replace the laminar flow with the turbulent flow, so that the cooling efficiency can be improved. For example, as shown in fig. 6, a member 60 that blocks the flow of the cooling medium is provided on at least one of the inner peripheral surface 14a of the inner ring 14 and the heat transfer wall portion 41. At this time, a slit is formed in the cooling flow path 46 by the member 60. By such a slit structure, the flow is blocked, and the cooling medium becomes turbulent.

The specific structure of the RI fabrication apparatus and the target housing apparatus of the present invention is not limited to the above embodiment

Mode(s).

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

Claims

1. An RI production apparatus for producing radioactive isotopes by a nuclear reaction of a target irradiated with a particle beam, the RI production apparatus comprising:

a housing portion for housing the target at an irradiation position of the particle beam;

a first flow path capable of allowing a cooling medium to flow therethrough so as to cool the housing portion from a side relative to an irradiation axis of the particle beam; and

The second flow path is configured to allow a cooling medium to flow therethrough so as to cool the side surface of the container from a position outside the container with respect to the irradiation axis through at least a portion of a wall portion provided around the irradiation axis relative to the container.

The second flow path can cool a portion of the container that can accommodate the gas target.

2. An RI production apparatus for producing radioactive isotopes by a nuclear reaction of a target irradiated with a particle beam, the RI production apparatus comprising:

The accommodation portion includes a portion capable of accommodating a liquid target and a portion capable of accommodating a gas target.

3. The RI production apparatus according to claim 1 or 2, wherein:

The second flow path can cool a portion of the container that can accommodate the liquid target.

4. The RI production apparatus according to claim 1 or 2, wherein:

A member that obstructs the flow of the cooling medium is provided in the second flow path.

5. A target storage device for storing a target capable of producing a radioactive isotope by a nuclear reaction by being irradiated with a particle beam, the target storage device comprising:

a receiving portion for receiving the target;

a first flow path capable of flowing a cooling medium so as to cool the housing portion from a side relative to an irradiation axis of the particle beam when the target is irradiated with the particle beam; and

6. A target storage device for storing a target capable of producing a radioactive isotope by a nuclear reaction by being irradiated with a particle beam, the target storage device comprising:

a receiving portion for receiving the target;