Shield vessel

Abstract

To provide an improved shield vessel.SOLUTION: A shield vessel comprises an accommodation unit part a lid part. The accommodation part includes an opening and is constructed so that a radioactive article can be accommodated from the opening. The lid part is constructed as that it can be removably mounted to the accommodation part as so to close the opening, and includes a shield part, a first housing part, and a second housing part. The shield part is constructed so as to shield radiant rays while the lid part is mounted to the accommodation part in which a radioactive article is accommodated. The first housing part closes at least a section of the opening and holds the shield part. The second housing part is removably mounted to the first housing part from the side opposite the opening. The first housing part includes a covering part for covering at least a section of the opening, and a circumferential wall part extending from the periphery of the covering part toward the second housing part. The inner circumferential surface of the circumferential wall and a section of the outer circumferential surface of the shield part face each other via a gap provided between the inner circumferential surface of the circumferential wall part and the outer circumferential surface of the shield part in a direction different from a first direction in which the shield part separates form the first housing part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a shielded container. [Background technology]

[0002] Patent Document 1 discloses a technology that prevents exposure of radiation shielding such as lead, prevents the radiation shielding on the lid side from falling under its own weight, provides sufficient horizontal support for the radiation shielding on the container body side, prevents liquid leakage from the container mechanism, and makes it easy to disassemble the container when reusing or recycling it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-227094 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is still room for improvement in the technology relating to the above containers. [Means for solving the problem]

[0005] According to one aspect of the present invention, a shielding container is provided. The shielding container includes a storage section and a lid section. The storage section includes an opening and is configured to be able to store a radioactive article through the opening. The lid section is configured to be removably attached to the storage section so as to block the opening, and includes a shielding section, a first housing section, and a second housing section. The shielding section is configured to block radiation emitted from the radioactive article when the lid section is attached to the storage section that contains the radioactive article. The first housing section is configured to block at least a portion of the opening and to hold the shielding section. The second housing section is removably attached to the first housing section from the side opposite the opening. The first housing section includes a covering section configured to cover at least a portion of the opening, and a peripheral wall section extending from the periphery of the covering section toward the second housing section. At least a portion of the inner surface of the peripheral wall portion and the outer surface of the shielding portion are configured to face each other via a gap provided between the inner surface of the peripheral wall portion and the outer surface of the shielding portion in a direction different from a first direction in which the shielding portion moves away from the first housing portion.

[0006] With this configuration, a better shielding container can be provided. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a diagram showing an example of an exploded perspective view of the shielding container 1. [Diagram 2] 2 is a diagram showing an example of an AA cross-sectional view of the shielding container 1 of FIG. 1 after assembly. [Diagram 3] 3 is a partial enlarged view of the lid portion 3 shown in FIG. 2. [Figure 4] FIG. 2 is a side view of the overcap 6. [Diagram 5] FIG. 2 is a rear view of the overcap 6. [Figure 6] 3 is a cross-sectional view showing a modified example of the shielding container 1 shown in FIG. 2. [Figure 7] 3 is a diagram showing a modified example of the shielding container 1 shown in FIG. 2. [Figure 8] 3 is a diagram showing a modified example of the shielding container 1 shown in FIG. 2. [Figure 9]3 is a diagram showing a modified example of the shielding container 1 shown in FIG. 2. [Figure 10] 3 is a diagram showing a modified example of the shielding container 1 shown in FIG. 2. [Figure 11] 13A and 13B are diagrams showing a modified example of the cover portion 3 including a region where the separation distance L1 increases sharply in the opening direction D1. [Figure 12] 13A and 13B are diagrams showing a modified example of the cover portion 3 including a region where the separation distance L1 increases sharply in the opening direction D1. [Figure 13] 13A and 13B are diagrams showing modified examples of the lid portion 3 when the separation distance L1 is constant, etc. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic features shown in the following embodiments can be combined with each other.

[0009] 1. Overview of Shielding Container 1 In this section, an overview of the shielding container 1 will be described. FIG. 1 is a diagram showing an example of an exploded perspective view of the shielding container 1. The shielding container 1 is a container capable of containing a radioactive pharmaceutical Md so as to shield radiation generated from the radioactive pharmaceutical Md. The radioactive pharmaceutical Md is an example of a radioactive article, such as a radioactive test drug or a radioactive therapeutic drug. For example, the shielding container 1 includes a container section 2 and a lid section 3.

[0010] The container 2 has an opening 2a and is configured to be able to contain the radiopharmaceutical Md through the opening 2a. In this embodiment, the container 2 is formed in a cylindrical shape extending in an opening direction D1, and the opening 2a is formed at one of its ends.

[0011] The lid part 3 is configured to be detachably attached to the storage part 2 so as to close the opening 2a. The lid part 3 includes a bottle cap 4 as an example of a first housing part, a shielding part 5, and an overcap 6 as an example of a second housing part. The bottle cap 4 is configured to close the opening 2a from the opening direction D1. The shielding part 5 is configured to be held by the bottle cap 4 so as to close the opening 2a through the bottle cap 4. The overcap 6 is detachably attached to the bottle cap 4 from the side opposite the opening 2a. The overcap 6 is configured to be able to accommodate the shielding part 5 by being attached to the bottle cap 4. As a result, the bottle cap 4 and the overcap 6 function as a housing that accommodates the shielding part 5 therein. In this embodiment, the bottle cap 4, the shielding part 5, and the overcap 6 are assembled so as to overlap with each other in the opening direction D1. Therefore, in this embodiment, the opening direction D1 is also the facing direction in which the bottle cap 4 and the overcap 6 face each other. The facing direction is an example of a first direction. For convenience of explanation, the direction perpendicular to the opening direction D1 will be referred to as the radial direction D2 below.

[0012] 2. Details of Shielding Container 1 In this section, the details of each component of the shielding container 1 described above will be described as an example. Fig. 2 is a diagram showing an example of an AA cross-sectional view of the shielding container 1 of Fig. 1 after assembly. Fig. 3 is a partially enlarged view of the lid part 3 shown in Fig. 2. As shown in Fig. 2, the storage part 2 of this embodiment includes a storage shielding part 21, a storage part housing 22, and a closing joint part 23.

[0013] The storage shielding section 21 is made of a material capable of blocking radiation emitted from the radiopharmaceutical Md, for example, a material containing as a main component a heavy metal such as lead, tungsten, etc. The storage shielding section 21 is formed in a cylindrical shape having a bottom, and a storage space SP1 capable of storing the radiopharmaceutical Md is defined inside the cylinder.

[0014] The accommodation unit housing 22 is a housing capable of housing the accommodation shielding unit 21 therein, and is formed of, for example, plastic etc. The accommodation unit housing 22 has the same shape as the accommodation shielding unit 21.

[0015] The closure coupling part 23 is configured to be capable of coupling with the lid part 3. The closure coupling part 23 of the present embodiment extends in a cylindrical shape from the end part of the storage part housing 22 along the opening direction D1, and has projections and recesses on its outer circumferential surface to which the lid part 3 can be screwed.

[0016] As described above, the lid portion 3 includes the bottle cap 4, the shielding portion 5, and the overcap 6. As shown in Figures 2 and 3, in this embodiment, the bottle cap 4 includes a covering portion 41, a peripheral wall portion 42, a closure joint portion 43, and a bottle joint portion 44.

[0017] The covering portion 41 forms the bottom of the bottle cap 4, and is configured to cover the opening 2a when the lid portion 3 is attached to the container portion 2. For example, the covering portion 41 is a disk-shaped member having a surface perpendicular to the opening direction D1. The covering portion 41 includes a positioning protrusion 411 and a positioning recess 412. The positioning protrusion 411 is located at the center of the covering portion 41, and is a protrusion that protrudes toward the overcap 6. The positioning recess 412 is located on the outer periphery of the covering portion 41 from the positioning protrusion 411, and is a recess that is recessed in the opening direction D1 so as to move away from the overcap 6. In this embodiment, the positioning recess 412 is provided so as to form an annular, more specifically, an annular groove.

[0018] The peripheral wall portion 42 extends from the periphery of the covering portion 41 toward the overcap 6. For example, the peripheral wall portion 42 extends from the outer edge of the covering portion 41 toward the side opposite to the opening 2a, in other words, toward the overcap 6, along the opening direction D1. In this embodiment, the peripheral wall portion 42 is formed in a cylindrical shape and includes an inner peripheral surface 421 and an outer peripheral surface 422.

[0019] In the present embodiment, the inner circumferential surface 421 of the peripheral wall portion 42 is inclined so as to continuously move away from the center of the covering portion 41 in the radial direction D2 as it moves away from the covering portion 41 in the opening direction D1. The inclination angle of the inner circumferential surface 421 with respect to the covering portion 41 (specifically, the surface of the covering portion 41 that faces the overcap 6 and is perpendicular to the opening direction D1) is any angle less than 90 degrees, and specifically, for example, may be 80, 81, 82, 83, 84, 85, 86, 87, 88, or 89 degrees, and may be within a range between any two of the numerical values ​​exemplified here. Hereinafter, for convenience of explanation, the end of the inner circumferential surface 421 of the peripheral wall portion 42 that is connected to the covering portion 41 is referred to as the first end 421a, and the end of the inner circumferential surface 421 of the peripheral wall portion 42 that is located opposite the first end 421a in the opening direction D1 is referred to as the second end 421b. The first end 421a defines the outer edge of the area where the shielding part 5 is placed, and the second end 421b defines an introduction port when the shielding part 5 is placed on the covering part 41. When the bottle cap 4 is viewed in plan from the opening direction D1, the area whose outer edge is defined by the first end 421a is configured to be included in the area whose outer edge is defined by the second end 421b located opposite to the first end 421a in the opening direction D1. This makes it easy to accommodate the shielding part 5 in the bottle cap 4, while allowing the shielding part 5 to be guided to a predetermined position on the covering part 41. The "center" of the shielding container 1 refers to the vicinity of the axis of rotational symmetry C of the shielding container 1, and in this embodiment, refers to the axis of rotational symmetry C. The axis of rotational symmetry C does not need to be actually constituted by a columnar member, and may be a virtual axis. The same applies to each member (the storage part 2, the lid part 3, the bottle cap 4, the shielding part 5, etc.) included in the shielding container 1.

[0020] The outer peripheral surface 422 of the peripheral wall portion 42 is a surface located opposite to the inner peripheral surface 421 in the thickness direction of the peripheral wall portion 42. Like the inner peripheral surface 421, the outer peripheral surface 422 in this embodiment is inclined so as to move away from the center of the covering portion 41 (for example, the axis of rotational symmetry C) in the radial direction D2 as it moves away from the covering portion 41 in the opening direction D1, so that the peripheral wall portion 42 is configured to have a constant thickness.

[0021] The occluding joint 43 is configured to be joined to the occluding joint 23. In this embodiment, the occluding joint 43 is configured to be screwable with the occluding joint 23. The occluding joints 23, 43 can be joined in any manner, and may be configured to be fitted by press-fitting, for example. In this embodiment, the occluding joint 43 extends from the second end 421b of the peripheral wall 42 along the opening direction D1 toward the opening 2a. As a result, the inner circumferential surface 431 of the occluding joint 43 faces the outer circumferential surface 422 of the peripheral wall 42 with a gap in the radial direction D2. A space is defined between the outer circumferential surface 422 of the peripheral wall 42 and the inner circumferential surface 431 of the occluding joint 43 into which a part of the storage section 2, for example, the occluding joint 23, can be inserted. This allows the storage unit 2 and the lid unit 3 to be coupled after a portion of the occluding coupling part 23 is inserted into the space and the storage unit 2 and the lid unit 3 are roughly positioned, thereby providing a lid unit 3 that is easier to attach to the storage unit 2. In particular, since the outer circumferential surface 422 of the peripheral wall part 42 is inclined so as to move away from the center of the covering part 41 as it moves away from the covering part 41 in the opening direction D1, it becomes easy to guide the occluding coupling part 23 between the outer circumferential surface 422 of the peripheral wall part 42 and the inner circumferential surface 431 of the occluding coupling part 43.

[0022] The bottle coupling portion 44 extends from the vicinity of the second end 421b of the inner circumferential surface 421 along the opening direction D1 so as to move away from the covering portion 41. The bottle coupling portion 44 is configured to be coupleable with the overcap 6, and includes, for example, an elastically deformable claw such as a snap fit.

[0023] The shielding part 5 is configured to shield radiation emitted from the radioactive pharmaceutical Md when the lid part 3 is attached to the storage part 2 containing the radioactive pharmaceutical Md. The shielding part 5 is made of a material containing lead or the like as a main component, similar to the storage shielding part 21. The shielding part 5 is placed on the covering part 41, and thus the bottle cap 4 is configured to hold the shielding part 5 by the covering part 41. The shielding part 5 of this embodiment includes a contact part 51 and a convex part 52.

[0024] The contact portion 51 is a flat plate-shaped portion configured to come into contact with the covering portion 41 of the shielding portion 5. The contact portion 51 includes a contact surface 511, an outer circumferential surface 512, and an outer circumferential opposing surface 513.

[0025] The contact surface 511 is a substantially circular surface facing the covering part 41 in the opening direction D1, and comes into contact with the covering part 41 when the shielding part 5 is placed on the covering part 41. The contact surface 511 may have projections and recesses that abut against the positioning protrusions 411 and the positioning recesses 412. This makes it easier for the bottle cap 4 and the shielding part 5 to maintain an appropriate positional relationship.

[0026] The outer peripheral surface 512 of the contact portion 51 is configured to face the inner peripheral surface 421 of the peripheral wall portion 42 via a gap G in a direction different from the opening direction D1 (for example, at least the radial direction D2). The gap G is provided between the inner peripheral surface 421 of the peripheral wall portion 42 and the outer peripheral surface 512 of the shielding portion 5. For example, the outer peripheral surface 512 of the shielding portion 5 includes a region in which the separation distance L1 from the inner peripheral surface 421 of the peripheral wall portion 42 increases as it moves away from the covering portion 41 in the opening direction D1, and is configured to be inclined in a direction different from the opening direction D1 (for example, the radial direction D2) with respect to the contact surface 511 of the shielding portion 5. Specifically, the outer peripheral surface 512 is inclined with respect to the contact surface 511 so as to approach the center (for example, the axis of rotational symmetry C) of the shielding portion 5 along the radial direction D2 as it moves away from the contact surface 51 in the thickness direction (the opening direction D1 in this embodiment). The inclination angle of the outer peripheral surface 512 with respect to the contact surface 511 is arbitrary as long as it is less than 90 degrees, but specifically, for example, it may be 80, 81, 82, 83, 84, 85, 86, 87, 88, or 89 degrees, and may be within a range between any two of the numerical values ​​exemplified here. In this way, the inner peripheral surface 421 of the peripheral wall portion 42 and the outer peripheral surface 512 of the contact portion 51 are inclined so as to move away from each other as they move away from the opening 2a in the opening direction D1. As a result, the inner peripheral surface 421 of the peripheral wall portion 42 is configured so that the separation distance L1 between the inner peripheral surface 421 of the peripheral wall portion 42 and the outer peripheral surface 512 of the shielding portion 5 gradually increases in the opening direction D1, and is inclined in a direction different from the opening direction D1 (for example, the radial direction D2) with respect to the covering portion 41. With this configuration, when the shielding portion 5 is housed in the housing, it is easy to arrange the shielding portion 5 at a predetermined position along the inclined surface. Therefore, the deterioration of the shielding performance of the shielding portion 5 due to misalignment can be further suppressed.

[0027] The outer peripheral facing surface 513 faces the overcap 6 in the opening direction D1 in which the shielding portion 5 moves away from the bottle cap 4.

[0028] The protrusion 52 is configured to protrude in the opening direction D1 from the outer circumferential opposing surface 513 of the contact portion 51. The protrusion 52 is located at the center of the shielding portion 5 in a plane perpendicular to the opening direction D1. The protrusion 52 includes a central opposing surface 521, which is an example of a first opposing surface, and a shielding peripheral surface 522.

[0029] The central facing surface 521 is located at the center of the shielding part 5 and is configured to face the overcap 6 in the opening direction D1 in which the shielding part 5 moves away from the bottle cap 4. When the central facing surface 521 is viewed from above in the opening direction D1, the outer peripheral facing surface 513 is located on the outer peripheral side of the central facing surface 521. Therefore, the outer peripheral facing surface 513 is an example of a second facing surface. In this embodiment, since the convex part 52 protrudes in the opening direction D1 from the contact part 51 toward the overcap 6, the separation distance between the second facing surface and the overcap 6 in the opening direction D1 is larger than the separation distance between the first facing surface and the overcap 6 in the opening direction D1. According to this configuration, the concave part formed makes it easy to grip the shielding part 5. Therefore, it is easy to remove the shielding part 5 from the bottle cap 4, and it is possible to provide a shielding part 5 that is easy to reuse the shielding part 5. The central facing surface 521 in this embodiment is a circular surface perpendicular to the opening direction D1.

[0030] The shielding peripheral surface 522 connects the outer peripheral facing surface 513 and the central facing surface 521. The shielding peripheral surface 522 defines the outer peripheral surface of the protruding portion 52 extending cylindrically from the contact portion 51 along the opening direction D1. The shielding peripheral surface 522 is configured to face the peripheral wall portion 42 along a second direction (for example, radial direction D2) perpendicular to the opening direction D1. In this embodiment, the shielding peripheral surface 522 faces the peripheral wall portion 42 along the radial direction D2 via the leg portion 63 described later. As a result, the recessed portion R is defined by at least the outer peripheral facing surface 513, the shielding peripheral surface 522, and the peripheral wall portion 42. In this embodiment, the recessed portion R forms an annular groove surrounding the outer periphery of the protruding portion 52. The bottom surface of the recessed portion R is defined by the outer peripheral facing surface 513. The inner peripheral surface of the recessed portion R can be defined by the shielding peripheral surface 522. The outer peripheral surface of the recessed portion R is defined by the inner peripheral surface 421. According to such a configuration, while facilitating removal of the shielding part 5, the processing burden can be reduced compared to, for example, a case in which the recess R is provided in the shielding part 5 alone. Therefore, it is possible to provide a shielding container 1 in which the processing burden of the shielding part 5 is reduced. It is preferable that the recess R is formed so that the protrusion 52 can be grasped, particularly by a person's fingers. This allows the shielding part 5 to be removed from the bottle cap 4 by hand without the need for a dedicated tool.

[0031] The overcap 6 is coupled to the bottle cap 4 from the opening direction D1 to form a part of a housing capable of accommodating the shielding part 5. The overcap 6 includes a wall part 61, a coupling part 62, a leg part 63, and four wing parts 64.

[0032] The wall portion 61 is configured to be positioned opposite the covering portion 41 when the overcap 6 is attached to the bottle cap 4. For example, the wall portion 61 is a plate-like member having a thickness direction in the opening direction D1. The wall portion 61 faces the protrusion portion 52 in the opening direction D1. Accordingly, the protrusion portion 52 protrudes toward the wall portion 61.

[0033] The connecting portion 62 is continuous with the wall portion 61, protrudes toward the bottle cap 4, and is configured to be connected to the bottle cap 4 (more specifically, the bottle connecting portion 44). For example, the connecting portion 62 extends from the outer circumferential edge of the wall portion 61 toward the closure connecting portion 43, and is configured to be connected to the outer circumferential surface of the bottle connecting portion 44. The connecting portion 62 has, for example, a groove that engages with the claws of the bottle connecting portion 44. The length from the wall portion 61 (more specifically, the surface of the wall portion 61 facing the covering portion 41) to the end of the connecting portion 62 defines the protruding length L2 of the connecting portion 62.

[0034] The leg 63 protrudes from the wall 61 toward the covering 41. With this configuration, when an impact is applied to the cover 3 along the opening direction D1, the impact transmitted to the shielding 5 can be easily absorbed by the leg 63. Therefore, the shielding 5 can be protected more suitably. The leg 63 of this embodiment has a cylindrical shape, and the protrusion 52 is housed inside the cylinder. With this configuration, the shielding 5 can be suitably prevented from shifting in the opening direction D1 due to vibrations during transportation. As a result, the leg 63 can come into contact with the protrusion 52 so as to restrict movement in a direction different from the opening direction D1 (for example, the radial direction D2). With this configuration, the leg 63 can further restrict movement of the shielding 5 in the opening direction D1 as well as in a direction different from the opening direction D1. Therefore, it is possible to suppress a decrease in the shielding performance of the cover 3 due to a shift in the position of the shielding 5 when an impact is applied during transportation. The leg portion 63 in this embodiment is a cylindrical member extending from the wall portion 61 toward the covering portion 41 along the opening direction D1. At least a portion of the protrusion 52 is housed inside the cylinder of the leg portion 63. The leg portion 63 includes an end portion 631, a leg outer peripheral surface 632, and a leg inner peripheral surface 633.

[0035] The end 631 is an end of the leg 63 opposite to the wall 61, and is in contact with the shielding part 5 (in this embodiment, the outer peripheral facing surface 513). With this configuration, the leg 63 can more firmly restrict the movement of the shielding part 5 in the opening direction D1. Therefore, the shielding part 5 can be more suitably protected. Note that "two objects are in contact" may include, for example, the objects being in close contact with each other. The length from the wall 61 (more specifically, the surface of the wall 61 facing the covering part 41) to the end 631 defines the protruding length L3 of the leg 63. The protruding length L3 of the leg 63 is greater than the protruding length L2 of the joint part 62. With this configuration, when an impact is applied to the cover part 3 along the opening direction D1, the leg 63 can preferentially absorb the impact transmitted to the shielding part 5. Therefore, the shielding part 5 can be more suitably protected. In this embodiment, the protruding lengths L2 and L3 are both equal to the total length of the joint 62 and the leg 63 based on the wall 61, but when the joint 62 or the leg 63 has a bent portion, the protruding lengths L2 and L3 are defined as the length in the opening direction D1. The ratio L3 / L2 of the protruding length L2 of the joint 62 to the protruding length L3 of the leg 63 is preferably greater than 1, and specifically, for example, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, or 3, and may be within a range between any two of the numerical values ​​exemplified here. In particular, from the viewpoint of reducing the load on the joint 62 when restricting the movement of the shielding part 5 in the opening direction D1, the ratio L3 / L2 is preferably 2 or more.

[0036] The leg outer peripheral surface 632 is configured to face the inner peripheral surface 421 of the peripheral wall portion 42. As a result, at least a part of the leg outer peripheral surface 632 defines at least a part of the inner peripheral surface of the recess R in this embodiment.

[0037] In this embodiment, a leg inner peripheral surface 633, which is the inner peripheral surface of the leg 63, is in contact with and faces the shielding peripheral surface 522. As a result, when the shielding part 5 attempts to move in the radial direction D2 or the like, the leg inner peripheral surface 633 interferes with the shielding peripheral surface 522, thereby restricting the movement of the shielding part 5 in the radial direction D2 or the like.

[0038] FIG. 4 is a side view of the overcap 6. FIG. 5 is a rear view of the overcap 6. As shown in FIG. 4 and FIG. 5, each of the four wing portions 64 is a plate-like member extending from the leg inner peripheral surface 633 of the leg portion 63 toward the center of the overcap 6 (the rotational symmetry axis of the overcap 6 in this embodiment). The wing portion 64 may further be continuous with the wall portion 61. The four wing portions 64 are disposed at equal intervals along the cylindrical leg inner peripheral surface 633. The number and arrangement of the wing portions 64 are arbitrary. As shown in FIG. 2, the wing portion 64 in this embodiment has a regulating surface 641.

[0039] The restricting surface 641 is a surface facing the central facing surface 521 of the shielding part 5. For example, when the end 631 of the leg part 63 is in contact with the outer circumferential facing surface 513, the restricting surface 641 of the wing part 64 is in contact with the central facing surface 521 of the shielding part 5. This three-dimensionally distributes the contact portion between the shielding part 5 and the overcap 6 in the opening direction D1, so that the movement of the shielding part 5 in the opening direction D1 due to vibration or the like can be more stably restricted.

[0040] 3. Variations In this section, modified examples of the above embodiment will be described. The various modified examples described in this section and subsequent sections can be combined as desired as long as they are not technically inconsistent. In the following description of the modified examples, the same reference numbers will be used to designate configurations that correspond to the above embodiment, and the description thereof may be omitted.

[0041] FIG. 6 is a cross-sectional view showing a modified example of the shielding container 1 shown in FIG. 2. As shown in FIG. 6, the overcap 6 may not have the wing portion 64. In this case, only the end portion 631 of the leg portion 63 is configured to contact the shielding portion 5 (specifically, the outer peripheral facing surface 513) from the opening direction D1. In this modified example, the leg portion 63 is not configured to engage with the shielding peripheral surface 522. As a result, the force generated by the movement of the shielding portion 5 in the opening direction D1 of the leg portion 63 is transmitted to the wall portion 61 along the opening direction D1 in which the leg portion 63 extends via the end portion 631, so that the force caused by the movement of the shielding portion 5 in the opening direction D1 can be transmitted to the wall portion 61 more naturally than when the force is transmitted from the region where the leg portion inner peripheral surface 633 and the shielding peripheral surface 522 engage with each other. Therefore, the force absorption performance of the leg portion 63 in the opening direction D1 can be improved, and the bottle cap 4 and the shielding portion 5 covered by the overcap 6 can be more appropriately protected.

[0042] Fig. 7 is a diagram showing a modified example of the shielding container 1 shown in Fig. 2. As shown in Fig. 7, the overcap 6 does not need to be configured so that the end 631 of the leg 63 comes into contact with the shielding portion 5 from the opening direction D1, and may be configured so that, for example, the restricting surface 641 of the wing portion 64 comes into contact with the shielding portion 5 (specifically, the central opposing surface 521) from the opening direction D1. In this modified example, when the shielding portion 5 attempts to move from the covering portion 41 in the opening direction D1, the wing portion 64 restricts the movement via the restricting surface 641.

[0043] Fig. 8 is a diagram showing a modified example of the shielding container 1 shown in Fig. 2. As shown in Fig. 8, the protruding length L3 of the leg portion 63 may be shorter than the protruding length L2 of the connecting portion 62. Also, as shown in Fig. 8, the end portion 631 of the leg portion 63 may be configured to contact the central opposing surface 521 instead of the outer circumferential opposing surface 513.

[0044] FIG. 9 is a diagram showing a modified example of the shielding container 1 shown in FIG. 2. As shown in FIG. 9, the overcap 6 does not need to include the leg portion 63. In this case, the overcap 6 is preferably configured so that the wall portion 61 comes into contact with the shielding portion 5 from the opening direction D1. For example, in this modified example, the surface of the wall portion 61 facing the covering portion 41 is configured to come into surface-to-surface contact with the central facing surface 521 of the protrusion 52 of the shielding portion 5. According to these various modified examples, the overcap 6 is not limited to the one having the leg portion 63 whose end portion 631 and the outer peripheral facing surface 513 come into contact with each other from the opening direction D1, and any shape that restricts the movement of the shielding portion 5 from the covering portion 41 in the opening direction D1 may be adopted.

[0045] The recess R is not limited to being defined by the peripheral wall 42, the outer circumferential facing surface 513, and the shielding peripheral surface 522. Fig. 10 is a diagram showing a modified example of the shielding container 1 shown in Fig. 2. As shown in Fig. 10, the recess R may be formed, for example, only by the shielding part 5. In this modified example, the recess R is formed by a part of the outer circumferential facing surface 513 being recessed in the opening direction D1 from the connection part with the outer circumferential surface 512. According to such a configuration, the shielding part 5 can be easily removed from the bottle cap 4 by hooking a finger or the like on the recess R, and therefore the ease of disassembling the lid part 3 can be improved.

[0046] The configuration example in which the separation distance L1 gradually increases in the opening direction D1 is not limited to the above. One of the inner circumferential surface 421 of the peripheral wall portion 42 or the outer circumferential surface 512 of the contact portion 51 may be aligned along the opening direction D1, and the other may be inclined as described above. Moreover, each of the inner circumferential surface 421 of the peripheral wall portion 42 and the outer circumferential surface 512 of the contact portion 51 may not be inclined over its entire area, and may be inclined partially.

[0047] The lid 3, etc. may not be configured so that the separation distance L1 gradually increases in the opening direction D1, and may include, for example, a region in which the separation distance L1 increases discontinuously in the opening direction D1. FIG. 11 is a diagram showing a modified example of the lid 3 including a region in which the separation distance L1 increases suddenly in the opening direction D1. As shown in FIG. 11, the outer peripheral surface 512 of the convex portion 52 in the shielding portion 5 according to this modified example includes a step surface 7 in which the opening direction D1 increases suddenly at a certain position away from the contact portion 51. The thickness of the contact portion 51 at the portion where the step surface 7 is defined is smaller than the distance from the contact surface 511 to the outer peripheral facing surface 513 (in other words, the thickness at the center of the contact portion 51), so that the inner peripheral surface 421 and the outer peripheral surface 512 are less likely to interfere with each other. This makes it easier to guide the shielding portion 5 to an appropriate position on the covering portion 41 along the peripheral wall portion 42.

[0048] The region where the separation distance L1 increases discontinuously in the opening direction D1 may be introduced by the peripheral wall portion 42. FIG. 12 is a diagram showing a modified example of the lid portion 3 including a region where the separation distance L1 increases rapidly in the opening direction D1. As shown in FIG. 12, the inner peripheral surface 421 of the modified example includes a concave surface 423 recessed away from the center of the bottle cap 4. The concave surface 423 includes a portion facing the outer peripheral surface 512 in the opening direction D1 and a portion not facing the outer peripheral surface 512. The separation distance L1 between the concave surface 423 and the outer peripheral surface 512 of the contact portion 51 is configured to increase substantially discontinuously with respect to the separation distance L1 between the portion of the inner peripheral surface 421 other than the concave surface 423 and the outer peripheral surface 512 of the contact portion 51. According to this configuration, when the shielding part 5 is housed in the bottle cap 4, interference between the shielding part 5 and the peripheral wall part 42 is reduced in the region where the distance L1 increases due to the concave surface 423, and the shielding part 5 can be guided so that the covering part 41 and the contact part 51 come into contact with each other. As described above, the inner circumferential surface 421 of the peripheral wall part 42 can be configured to include a region where the distance L1 between the inner circumferential surface 421 of the peripheral wall part 42 and the outer circumferential surface 512 of the shielding part 5 increases as it moves away from the covering part 41 in the opening direction D1, and to be inclined in a direction different from the opening direction D1 (for example, the radial direction D2) with respect to the covering part 41. According to this configuration, the shielding part 5 can be easily guided to an appropriate position on the covering part 41 along the peripheral wall part 42.

[0049] The separation distance L1 may be constant. FIG. 13 is a diagram showing a modified example of the lid part 3 in the case where the separation distance L1 is constant. As shown in FIG. 13, the inner circumferential surface 421 of the peripheral wall part 42 and the outer circumferential surface 512 of the shielding part 5 may face each other through a gap G so that the separation distance L1 is constant even when the shielding part 5 is separated from the covering part 41 in the opening direction D1 by extending both of them along the opening direction D1. In this case, the movement of the shielding part 5 in the radial direction D2 may be restricted by the contact surface 511 interfering with the positioning protrusion 411 or the positioning recess 412. Also, as shown in FIG. 13, the inner circumferential surface 421 of the peripheral wall part 42 and the outer circumferential surface 512 of the shielding part 5 may be disposed apart so as not to contact each other. According to such a configuration, it is even easier to remove the shielding part 5 from the bottle cap 4. The configuration in which the inner circumferential surface 421 of the peripheral wall portion 42 and the outer circumferential surface 512 of the shielding portion 5 are spaced apart so as not to come into contact with each other is not limited to the modified example shown in FIG. 13, but can be applied to the above-mentioned embodiment and other modified examples. The gap G does not have to be provided over the entire area between the inner circumferential surface 421 of the peripheral wall portion 42 and the outer circumferential surface 512 of the shielding portion 5. For example, the inner circumferential surface 421 of the peripheral wall portion 42 and the outer circumferential surface 512 of the shielding portion 5 may be partially in contact with each other. In other words, the inner circumferential surface 421 of the peripheral wall portion 42 and a part of the outer circumferential surface 512 of the shielding portion 5 may be configured to face each other through the gap G provided between the inner circumferential surface 421 of the peripheral wall portion 42 and the outer circumferential surface 512 of the shielding portion 5 in a direction (for example, the radial direction D2) different from the opening direction D1 in which the shielding portion 5 separates from the bottle cap 4. With this configuration, it becomes easy to remove the shielding portion 5 from the bottle cap 4.

[0050] Covering portion 41 does not necessarily have to include positioning protrusion 411 and positioning recess 412, and may have any shape.

[0051] The shape of the protrusion 52 is arbitrary, and may be configured such that, for example, the diameter of the cross section perpendicular to the opening direction D1 changes, for example, gradually decreases, as it moves away from the contact portion 51 in the opening direction D1. In this case, the leg portion 63 may be formed along the shielding peripheral surface 522.

[0052] If the bottle cap 4 is capable of closing the opening 2a, the direction in which the shielding part 5 moves away from the bottle cap 4 (the first direction) does not have to be along the opening direction D1.

[0053] The leg portion 63 is not limited to being cylindrical, and may be any shape as long as it can be interposed between the wall portion 61 and the shielding portion 5. The number of the leg portion 63 is not limited to one, and may be multiple. When the overcap 6 includes multiple leg portions 63, it is sufficient that at least one of the leg portions 63 is configured to achieve the same effect as the leg portion 63 described in the above embodiment.

[0054] Bottle cap 4 is not limited to one that closes opening 2a entirely, and may be one that closes at least a part of opening 2a as long as it can hold shielding portion 5 in a manner that can block radiation.

[0055] The shape of the shielding container 1 is not limited to a cylindrical shape, and may be any shape, such as a prismatic shape or a cone shape, and may not necessarily be symmetric with a central axis of rotation in the opening direction D1. In this case, the "center" is not limited to the vicinity of the axis of rotational symmetry C of the shielding container 1, and may be, for example, a position on which an axis extending along the opening direction D1 that passes through the center of gravity of the shielding container 1 passes.

[0056] The shielding container 1 and the like may be provided in the following manner.

[0057] (1) A shielding container comprising a storage section and a lid section, the storage section having an opening and configured to be able to store a radioactive article through the opening, the lid section configured to be removably attached to the storage section so as to cover the opening, a shielding section, a first housing section, and a second housing section, the shielding section configured to shield radiation emitted from the radioactive article in a state in which the lid section is attached to the storage section containing the radioactive article, the first housing section configured to cover at least a portion of the opening and to hold the shielding section. the second housing part is detachably attached to the first housing part from an opposite side to the opening part, the first housing part includes a covering part configured to cover at least a portion of the opening part, and a peripheral wall part extending from a periphery of the covering part toward the second housing part, and at least a portion of an inner circumferential surface of the peripheral wall part and an outer circumferential surface of the shielding part are configured to face each other via a gap provided between the inner circumferential surface of the peripheral wall part and the outer circumferential surface of the shielding part in a direction different from a first direction in which the shielding part is separated from the first housing part.

[0058] With this configuration, it becomes easy to remove the shielding part from the bottle cap.

[0059] (2) The shielding container described in (1) above, wherein the inner surface of the peripheral wall portion includes a region in which the distance between the inner surface of the peripheral wall portion and the outer surface of the shielding portion increases as the inner surface moves away from the covering portion in the first direction, and the shielding container is configured to be inclined in a direction different from the first direction relative to the covering portion.

[0060] With this configuration, it is possible to easily guide the shielding portion along the peripheral wall portion to an appropriate position on the covering portion.

[0061] (3) A shielding container as described in (1) or (2) above, wherein the inner surface of the peripheral wall portion is configured so that the distance between the inner surface of the peripheral wall portion and the outer surface of the shielding portion gradually increases in the first direction and is inclined in a direction different from the first direction relative to the covering portion.

[0062] According to this configuration, when the shielding portion is housed in the housing, the shielding portion can be easily arranged at a predetermined position along the inclined surface, and therefore deterioration of the shielding performance of the shielding portion due to misalignment can be further suppressed.

[0063] (4) A shielding container according to any one of (1) to (3) above, wherein the shielding portion has a contact surface that contacts the covering portion, the outer peripheral surface of the shielding portion includes a region in which the separation distance from the inner peripheral surface of the peripheral wall portion increases as the outer peripheral surface of the shielding portion moves away from the covering portion in the first direction, and the shielding container is configured to be inclined in a direction different from the first direction with respect to the contact surface of the shielding portion.

[0064] With this configuration, a clearance can be obtained between the shielding portion and the surrounding wall portion, making it possible to provide a shielding container that can easily accommodate the shielding portion and easily remove the accommodated shielding portion.

[0065] (5) A shielding container according to any one of (1) to (4) above, wherein the shielding portion includes a first opposing surface facing the second housing portion in the first direction and a second opposing surface located on the outer circumferential side of the first opposing surface, and the distance between the second opposing surface and the second housing portion in the first direction is greater than the distance between the first opposing surface and the second housing portion in the first direction.

[0066] According to this configuration, the recessed portion makes it easy to grip the shielding portion, which makes it easy to remove the shielding portion from the first housing, and therefore makes it possible to provide a shielding portion that is easy to reuse.

[0067] (6) A shielding container as described in (5) above, wherein the shielding portion has a shielding peripheral surface connecting the first opposing surface and the second opposing surface, the peripheral wall portion is configured to face the shielding peripheral surface along a second direction perpendicular to the first direction, and a recess is defined by at least the second opposing surface, the shielding peripheral surface, and the peripheral wall portion.

[0068] According to this configuration, the shielding portion can be easily removed, and the processing burden can be reduced compared to when a recess is provided in the shielding portion alone. Therefore, it is possible to provide a shielding container with a reduced processing burden for the shielding portion.

[0069] (7) The shielding container according to any one of (1) to (6) above, wherein the second housing portion is configured to restrict movement of the shielding portion from the covering portion in the first direction.

[0070] According to this configuration, it is possible to suitably prevent the shielding portion from shifting in the first direction due to vibrations or the like during transportation.

[0071] (8) A shielding container as described in (7) above, wherein the second housing part has a wall part and at least one leg part, the wall part is configured to be positioned opposite the covering part when the second housing part is attached to the first housing part, and the at least one leg part protrudes from the wall part toward the covering part.

[0072] According to this configuration, when an impact is applied to the cover in the first direction, the impact is easily absorbed by the legs, thereby more effectively protecting the shielding portion.

[0073] (9) The shielding container according to (8) above, wherein an end of the at least one leg portion opposite the wall portion is in contact with the shielding portion.

[0074] According to this configuration, the leg portion can more firmly restrict the movement of the shielding portion in the first direction, and therefore the shielding portion can be more suitably protected.

[0075] (10) A shielding container as described in (8) or (9) above, wherein the shielding portion has a protrusion protruding toward the wall portion, and the at least one leg portion further contacts the protrusion so as to restrict movement in a direction different from the first direction.

[0076] With this configuration, the legs can restrict the movement of the shielding part in the first direction, as well as in a direction different from the first direction. This can prevent the shielding part from shifting in position when subjected to an impact during transportation, etc., thereby preventing the shielding performance of the lid part from decreasing.

[0077] (11) A shielding container according to any one of (8) to (10) above, wherein the second housing further includes a connecting portion continuous with the wall portion, the connecting portion protruding toward the first housing and configured to be connected to the first housing, and the protruding length of the at least one leg is greater than the protruding length of the connecting portion.

[0078] According to this configuration, when an impact is applied to the cover in the first direction, the impact is transmitted to the shielding portion and can be preferentially absorbed by the legs, thereby more effectively protecting the shielding portion.

[0079] (12) The shielding container according to any one of (1) to (11) above, wherein an inner circumferential surface of the peripheral wall portion and an outer circumferential surface of the shielding portion are disposed apart from each other so as not to come into contact with each other.

[0080] With this configuration, it becomes even easier to remove the shielding part from the first housing part. Of course, this is not the case.

[0081] Finally, although various embodiments according to the present disclosure have been described, these are presented as examples and are not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The embodiments and their modifications are included within the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0082] 1: Shielding container 2: Storage section 2a: opening 21: Containment shield 22: Housing 23: Occlusion joint 3: Lid 4: Bottle caps 41: Covering part 411: Positioning protrusion 412: Positioning recess 42: Peripheral wall part 421: Inner surface 421a: 1st end 421b: 2nd end 422: Outer surface 423: Concave 43: Occlusion joint 431: Inner surface 44: Bottle joint 5: Shield part 51: Contact part 511: Contact surface 512: Outer surface 513: Outer periphery facing surface 52: Convex 521: Center facing surface 522: Shielding surface 6: Overcap 61 :Wall part 62:Joining part 63: Legs 631: End 632: Leg outer circumferential surface 633: Inner peripheral surface of leg 64: Wings 641: Regulatory aspects 7: Step surface C: Axis of rotational symmetry D1:Opening direction D2: Radial direction G: Gap L1: Separation distance L2, L3: protruding length Md: Radiopharmaceutical R: Recess SP1: Containment Space

Claims

1. A shielding container comprising: The container has a storage section and a lid section. The storage unit is configured to include an opening and to be able to store a radioactive article through the opening, the lid portion is configured to be removably attached to the storage portion so as to cover the opening, and includes a shielding portion, a first housing portion, and a second housing portion; the shielding part is configured to shield radiation emitted from the radioactive article in a state in which the lid part is attached to the housing part housing the radioactive article, the first housing portion is configured to close at least a portion of the opening and to hold the shielding portion; the second housing is detachably attached to the first housing from an opposite side to the opening, The first housing portion includes a covering portion configured to cover at least a portion of the opening portion, and a peripheral wall portion extending from a periphery of the covering portion toward the second housing portion, A shielding container configured so that at least a portion of an inner surface of the peripheral wall portion and an outer surface of the shielding portion face each other through a gap provided between the inner surface of the peripheral wall portion and the outer surface of the shielding portion in a direction different from a first direction in which the shielding portion moves away from the first housing portion.

2. 2. The shielding container according to claim 1, A shielding container, wherein an inner surface of the peripheral wall portion includes a region in which a distance between the inner surface of the peripheral wall portion and an outer surface of the shielding portion increases as the inner surface moves away from the covering portion in the first direction, and the shielding container is configured to be inclined in a direction different from the first direction relative to the covering portion.

3. 2. The shielding container according to claim 1, A shielding container, wherein the inner surface of the peripheral wall portion is configured so that the distance between the inner surface of the peripheral wall portion and the outer surface of the shielding portion gradually increases in the first direction and is inclined in a direction different from the first direction relative to the covering portion.

4. 2. The shielding container according to claim 1, the shielding portion has a contact surface that comes into contact with the covering portion, A shielding container, wherein the outer peripheral surface of the shielding portion includes a region in which the separation distance from the inner peripheral surface of the peripheral wall portion increases as the outer peripheral surface moves away from the covering portion in the first direction, and the outer peripheral surface is configured to be inclined in a direction different from the first direction with respect to the contact surface of the shielding portion.

5. 2. The shielding container according to claim 1, the shielding portion includes a first opposing surface facing the second housing portion in the first direction and a second opposing surface located on an outer circumferential side of the first opposing surface, A shielding container, wherein a distance between the second opposing surface and the second housing portion in the first direction is greater than a distance between the first opposing surface and the second housing portion in the first direction.

6. The shielding container according to claim 5, the shielding portion includes a shielding peripheral surface connecting the first opposing surface and the second opposing surface, A shielding container, wherein the peripheral wall portion is configured to face the shielding peripheral surface along a second direction perpendicular to the first direction, and a recess is defined by at least the second opposing surface, the shielding peripheral surface, and the peripheral wall portion.

7. 2. The shielding container according to claim 1, A shielding container, wherein the second housing portion is configured to restrict movement of the shielding portion from the covering portion in the first direction.

8. The shielding container according to claim 7, The second housing portion includes a wall portion and at least one leg portion. the wall portion is configured to be positioned opposite the covering portion when the second housing portion is attached to the first housing portion; The at least one leg projects from the wall toward the cover.

9. 9. The shielding container according to claim 8, A shielded container, wherein an end of the at least one leg opposite the wall is in contact with the shield.

10. 9. The shielding container according to claim 8, The shielding portion includes a protrusion protruding toward the wall portion, The at least one leg portion further contacts the protrusion portion so as to restrict movement in a direction different from the first direction.

11. 9. The shielding container according to claim 8, The second housing further includes a coupling portion that is continuous with the wall portion, the coupling portion protruding toward the first housing and configured to be coupled to the first housing portion; A shielding container, wherein a protruding length of the at least one leg portion is greater than a protruding length of the coupling portion.

12. 2. The shielding container according to claim 1, A shielding container, wherein an inner circumferential surface of the peripheral wall portion and an outer circumferential surface of the shielding portion are arranged apart so as not to come into contact with each other.

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