JP2012103193A - Radioactive source accommodation fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radioactive source accommodation fixture for facilitating handling of a radioactive source used for calibration of radioactive ray detector capable of measuring radioactive concentration, surface contamination density, and surface dose equivalent of a drum can in which radioactive substance is sealed, and shortening the handling time of the radioactive source.SOLUTION: The radioactive source accommodation fixture includes a plate-like member having a prescribed width and prescribed length, a radioactive source accommodation hole formed in the plate-like member, a lid for covering the radioactive source accommodation hole, a hinge section fixing one end of the lid so as to open/close the lid with the one end as a base end; and an engagement section for engaging the other end of the lid with the plate-like member.

Description

  The present invention relates to an apparatus for inspecting a radioactive substance, particularly a radiation detector for inspecting a radioactive substance by measuring a radioactive concentration, a surface contamination density, and a surface dose equivalent rate of a drum can encapsulating the radioactive substance in a nuclear power plant. The present invention relates to a radiation source accommodation jig for accommodating a radiation source used for calibration.

  In nuclear power plants, nuclear power plants are activated, and equipment and components such as nuclear reactors, turbine generators, various pumps, and pipes are activated to change into radioactive materials, or new radioactive materials are generated. Or These radioactive materials are disposed of as low-level radioactive waste. These low-level radioactive wastes are, for example, carried out of the power plant as drums in which radioactive substances are sealed, and then transferred to a predetermined place and disposed of.

  When drums that are disposed of as low-level radioactive waste are shipped out of the power plant, do the radioactive concentration, surface contamination density, surface dose equivalent rate, etc. meet certain standards for low-level radioactive waste? It is measured by a radiation detector. Such radiation detectors need to be properly calibrated to maintain performance. For this calibration, a radiation source of cobalt 60 or cesium 137 is used.

  By measuring the radiation emitted from these radiation sources, the radiation detector is calibrated. When such a radiation source is used for calibration of a radiation detector, it is arranged at a predetermined position of a calibration apparatus having the same drum can shape as that of low-level radioactive waste, for example, in a state accommodated in a radiation source accommodation jig. .

nothing special

  However, since these radiation sources are radiation sources managed in accordance with the law, they must be stored in a predetermined storage container except when used for calibration of radiation detectors. For this reason, it is necessary to take out the radiation source from the storage container and place it in a drum-shaped calibration device each time it is used. And after using for the calibration of a radiation detector, etc., it must be stored in a storage container again.

  Since the radiation source is managed based on the law, the time for handling these radiation sources is also limited so that the exposure dose of the handler does not exceed a predetermined value. For this reason, it has been required to shorten the handling time of the radiation source as much as possible. In particular, in a radiation source accommodation jig that accommodates a radiation source, there has been a demand for a device that can simplify the handling of the radiation source and shorten the handling time of the radiation source.

  In view of the above problems, the present invention handles a radiation source used for calibration of a radiation detector capable of measuring the radioactive concentration, surface contamination density, and surface dose equivalent rate of a drum can in which a radioactive substance is enclosed. An object of the present invention is to provide a radiation source accommodation jig that can be simplified and can reduce the handling time of the radiation source.

  In order to solve the above problems, a representative configuration of a radiation source accommodation jig according to the present invention is a radiation having a plate-like portion having a predetermined width and a predetermined length, and an opening on one surface of the plate-like portion. A source housing hole, a lid that covers the opening of the radiation source housing hole, a hinge that attaches one end to the plate-like portion so that the lid can be opened and closed with one end of the lid as a base end, and the lid is a plate-like portion And a locking portion for locking to the head.

  According to this configuration, the radiation source can be easily accommodated in the radiation source accommodation hole and taken out from the radiation source accommodation hole by opening and closing the lid. Therefore, handling of the radiation source can be simplified and the handling time of the radiation source can be shortened.

  Said radiation source accommodation hole is good to provide an elastic body between the bottom part of a radiation source accommodation hole, and the radiation source accommodated. According to such a configuration, when the lid is opened and the radiation source is taken out from the radiation source accommodation hole, the radiation source is pushed up to the outside of the radiation source accommodation hole by the elastic force of the elastic body. Thereby, a radiation source can be taken out easily. Therefore, handling of the radiation source can be simplified and the handling time of the radiation source can be shortened.

  Said latching | locking part has a slide part, It is good to perform latching to the plate-shaped part of a cover part by sliding a slide part and latching the other end of a cover part. According to this configuration, the lid portion can be easily locked to the plate-like portion. As a result, the radiation source can be easily accommodated and taken out from the radiation source accommodation hole, so that the radiation source can be handled easily and the handling time of the radiation source can be shortened.

  Another configuration of the radiation source accommodation jig according to the present invention includes a plate-like portion having a predetermined width and a predetermined length, a plate-like portion provided through the first opening on one surface of the plate-like portion. A radiation source containing hole having a second opening on the other surface of the plate-like part, a first lid covering the first opening of the radiation source containing hole, and the radiation source containing hole side A second lid portion that includes an elastic body and covers the second opening of the radiation source accommodation hole, and a first lid portion that can be opened and closed with one end of the first lid portion as a base end, one end being a plate-like portion A first hinge portion to be attached to the first hinge portion, a second hinge portion to be attached to the plate-like portion so that the second lid portion can be opened and closed with one end of the second lid portion as a base end, and a first lid portion A first locking portion that locks to the plate-like portion and a second locking portion that locks the second lid portion to the plate-like portion are provided.

  According to such a configuration, when the radiation source is accommodated in the radiation source accommodation hole, for example, the first lid is closed and the second lid is opened, and the radiation source is radiated from the second lid side. The radiation source can be easily accommodated by closing the second lid provided with the elastic body after being accommodated in the source accommodation hole. When removing the radiation source from the radiation source accommodation hole, when the first lid is opened and the radiation source is removed from the closed state of the first lid and the second lid, the radiation source is an elastic body. The radiation source can be easily taken out by being pushed upward by the elastic force of the radiation source accommodation hole. Therefore, handling of the radiation source can be simplified and the handling time of the radiation source can be shortened.

  Another configuration of the radiation source accommodation jig according to the present invention is used for calibration of a radiation detector capable of measuring the radioactive concentration, surface contamination density, and surface dose equivalent rate of a drum can in which a radioactive substance is enclosed. It contains a radiation source.

  For calibration of a radiation detector capable of measuring the radioactivity concentration, surface contamination density, and surface dose equivalent rate of a drum can in which a radioactive substance is sealed, a drum-shaped calibration device containing a radiation source is used. In accommodating the radiation source in the drum-shaped calibration device, the radiation source is accommodated in the radiation source accommodation jig, thereby simplifying the handling of the radiation source and shortening the handling time of the radiation source. . Therefore, this radiation source accommodation jig exhibits an effect especially in the usage method mentioned above.

  According to the present invention, it is possible to simplify the handling of a radiation source used for calibration of a radiation detector capable of measuring the radioactivity concentration, surface contamination density, and surface dose equivalent rate of a drum can in which a radioactive substance is enclosed. The handling time of the source can be shortened.

It is the schematic which shows the structure of the radiation source accommodation jig | tool concerning 1st Embodiment. It is a figure which shows the structure of a radiation source accommodating part. It is a figure explaining a slide part. It is a figure explaining the attachment state to the plate-shaped part of a slide part. It is a figure explaining accommodation of the radiation source by opening and closing of a lid part. It is a figure explaining the other structure of a latching | locking part. It is the schematic which shows the structure of the radiation source accommodation jig | tool concerning 2nd Embodiment. It is a figure explaining arrangement | positioning to the calibration apparatus of a drum can shape.

  Hereinafter, preferred embodiments of a radiation source accommodation jig according to the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

[First Embodiment]
1A and 1B are schematic views showing the configuration of a radiation source accommodation jig according to the first embodiment. FIG. 1A is a front view of the radiation source accommodation jig 1, and FIG. 1B is a radiation source accommodation jig. It is a side view of a tool.

  As shown in FIG. 1, the radiation source accommodation jig 1 (hereinafter referred to as “ray source accommodation jig 1”) includes a plate-like portion 11 and four radiation source accommodation portions (hereinafter referred to as “line source accommodation portion 10”). "). One radiation source accommodation unit 10 includes two radiation source accommodation holes (hereinafter referred to as “radiation source accommodation holes 12”), a lid part 13, a hinge part 14, and a locking part 15. .

  The plate-like portion 11 is a plate-like member having a predetermined width and a predetermined length. The thickness of the member is 8 mm, for example. The plate-like part 11 can be made of, for example, polyacetal (POM) having excellent mechanical characteristics and electrical characteristics. As shown in FIG. 1 (b), a reinforcing portion 60 is provided on the back surface of the plate-like portion 11. The reinforcing portion 60 is an aluminum plate-like member having the same width and length as the plate-like portion and having a thickness of 2 mm, for example. The mechanical strength of the plate-like portion 11 can be increased by the reinforcing portion 60.

  2A and 2B are diagrams showing the configuration of the radiation source accommodation unit. FIG. 2A is a front view of the radiation source accommodation unit 10, and FIG. 2B is a rear view of the radiation source accommodation unit 10.

  The radiation source accommodation holes 12 are substantially cylindrical holes having a substantially circular opening 12 a on one surface of the plate-like portion 11, and two are provided in one radiation source accommodation portion 10. It can be formed by processing one surface of the plate-like portion 11.

  The lid 13 covers the opening 12 a of the radiation source accommodation hole 12. As shown in FIG. 2A, the lid portion 13 has, for example, a rectangular shape, and the two opening portions 12 a can be covered with one lid portion 13. The lid portion 13 can be made of POM as is the material of the plate-like portion 11.

  The hinge portion 14 is for attaching one end 13 a of the lid portion 13 to the plate-like portion 11. 2A, by attaching one end 13a of the lid portion 13 to the surface of the plate-like portion 11, the lid portion 13 can be opened and closed with the one end 13a of the lid portion 13 as a base end via the hinge portion 14. It can be.

  The locking part 15 locks the lid part 13 to the plate-like part 11. The locking portion 15 in the first embodiment includes a slide portion 15, and the lid portion 13 is locked by sliding the slide portion 15 in the direction of the closed lid portion 13 to lock the other end 13 b of the lid portion 13. Can be locked to the plate-like portion 11.

  FIG. 3 is a diagram for explaining the slide portion. The main body of the slide part 15 is composed of divided slide parts 15a and 15b. The split slide portion 15a is formed by attaching a substantially cylindrical connecting portion 15c to a substantially rectangular parallelepiped member having a substantially rectangular parallelepiped cutout portion 15g at one end. The substantially rectangular parallelepiped member and the connection portion 15c can be processed and formed integrally to form the divided slide portion 15a. The split slide portion 15a is provided with a screw hole 15h that penetrates the split slide portion 15a including the connection portion 15c.

  The divided slide portion 15b is a substantially rectangular parallelepiped member having rounded corners, and includes two ball plungers 15e and 15f. The ball plungers 15e and 15f protrude from the surface of the divided slide portion 15b facing the divided slide portion 15a by a predetermined length. The split slide portion 15b is provided with a screw hole 15k that penetrates the split slide portion 15b.

  The slide portion 15 has the divided slide portions 15a and 15b facing each other such that the surface having the connection portion 15c of the divided slide portion 15a faces the surface from which the tip ends of the ball plungers 15e and 15f of the divided slide portion 15b protrude. The male screw 15d is screwed into the screw holes 15h and 15k in a state where the screw holes 15h and 15k are matched.

  4A and 4B are diagrams for explaining a mounting state of the slide portion to the plate-like portion. FIG. 4A is a schematic view of the back surface of the plate-like portion 11 before the slide portion 15 is attached, and FIG. It is the schematic of the same surface after attaching the slide part 15. FIG.

  As shown in FIG. 4A, a substantially rectangular parallelepiped hole having round corners is formed in a predetermined thickness portion from the back surface of the reinforcing portion 60 and the plate-like portion 11. The width of the substantially rectangular parallelepiped hole is substantially the same as the width of the divided slide portion 15b, and the length thereof is longer than the length of the divided slide portion 15b by the amount that the slide portion 15 can slide, and the thickness thereof is longer. It is substantially the same as the thickness of the divided slide portion 15b.

  A substantially rectangular groove portion 17 is formed in the intermediate thickness portion of the plate-like portion 11. The width of the groove portion 17 is substantially the same as the diameter of the connection portion 15c, and the length thereof is longer than the diameter of the connection portion 15c by an amount that allows the slide portion 15 to slide, and the thickness thereof is that of the connection portion 15c. It is almost the same as the thickness.

  The connecting portion 15c is inserted into the groove portion 17 so that the substantially rectangular parallelepiped member of the divided slide portion 15a is disposed on the back side in FIG. The split slide portion 15b is inserted from the front side of FIG. 4A so that the tip ends of the ball plungers 15e and 15f face the split slide portion 15a. The split slide portions 15a and 15b are connected by screwing the male screw 15d. As a result, the integrated slide portion 15 can slide along the groove portion 17.

  FIGS. 5A and 5B are diagrams illustrating accommodation of the radiation source by opening and closing the lid, FIG. 5A is a side view of the lid 13 in an open state, and FIG. 5B is a state in which the lid 13 is closed. FIG.

  As shown in FIG. 5A, the radiation source accommodation hole 12 includes an elastic body 16 between the bottom 12 b and the radiation sources 50 a and 50 b accommodated in the radiation source accommodation hole 12. The elastic body 16 is, for example, a helical coil spring 16. The radiation sources 50a and 50b are, for example, cobalt 60 and cesium 137, are formed in a substantially disc shape, and have a thickness of 5 to 6 mm.

  When the radiation sources 50a and 50b are accommodated in the two radiation source accommodation holes 12, respectively, as shown in FIG. 5A, the lid 13 is opened and the radiation sources 50a and 50b are placed in the radiation source accommodation holes 12 and 12, respectively. insert. At this time, by selecting a spring 16 having an appropriate elastic force, the lower part of the radiation sources 50a and 50b having a thickness of about 2 mm is placed in the radiation source receiving holes 12 and 12 in a state where no force is applied to the radiation sources 50a and 50b. The upper portions of the radiation sources 50a and 50b having a thickness of about 3 to 4 mm can come out of the radiation source receiving holes 12 and 12. By arranging a disk-shaped thin plate made of, for example, POM between the spring 16 and the radiation sources 50a and 50b, the radiation source 50a and 50b can be prevented from being damaged by the spring 16.

  Subsequently, the lid 13 is closed while pressing the radiation sources 50a, 50b from the upper surface. The slide portion 15 is attached to the plate-like portion 11 so as to be positioned on the lid portion 13 side where the notch portion 15g is closed, and after the lid portion 13 is closed, the slidable end on the opposite side to the lid portion 13 To the lid 13 direction. As a result, as shown in FIG. 5B, the other end 13 b of the lid portion 13 is inserted into the notch portion 15 g and the lid portion 13 is locked to the plate-like portion 11.

  It should be noted that the surfaces of the plate-like portion 11 facing the tip portions of the ball plungers 15e and 15f are respectively located where the tip portions of the ball plungers 15e and 15f are in contact with each other when the slide portion 15 is slidable at each end. A recess is provided (not shown). Thereby, when the slide part 15 is located at each slidable end, the tip parts of the ball plungers 15e and 15f and the recesses are fitted, whereby the slide part 15 can be fixed at both slidable ends. it can.

  Thereby, the lid 13 can be easily locked and released from the locked state after the lid 13 is closed, and the radiation source 50a and the radiation source receiving hole 12 of the radiation source 50b can be easily released. Can be easily accommodated and removed. For this reason, handling of the radiation sources 50a and 50b can be simplified, and the handling time of the radiation sources 50a and 50b can be shortened. Therefore, the radiation exposure amount at the time of handling the radiation sources 50a and 50b of the operator of the radiation sources 50a and 50b can be reduced.

  6A and 6B are diagrams for explaining another configuration of the locking portion. FIG. 6A is a view before the radiation sources 50a and 50b are accommodated in the radiation source accommodation hole 12, and FIG. 6B is a radiation source. FIG. 6C is a diagram when 50a and 50b are inserted into the radiation source accommodation hole 12, and FIG. 6C is a diagram after the radiation sources 50a and 50b are accommodated in the radiation source accommodation hole 12. FIG.

  As another configuration of the locking portion in the first embodiment, as shown in FIG. 6A, a rectangular metal fitting (locking tool) 26 having an open central portion is provided at the other end 23 b of the lid portion 23. It is done. A locking portion 25 that can be engaged with the locking tool 26 is provided at a predetermined position of the plate-like portion 11. According to such a configuration, as shown in FIG. 6 (b), the radiation sources 50a and 50b are inserted into the radiation source accommodation hole 12 with the lid portion 23 opened, and thereafter, as shown in FIG. 6 (c). After the lid portion 23 is closed, the lid portion 23 is locked to the plate-like portion 11 by the engagement of the locking tool 26 and the locking portion 25.

  Accordingly, even with such a configuration, the lid 23 can be easily opened and closed, and the radiation sources 50 a and 50 b can be accommodated in the radiation source accommodation hole 12 and taken out from the radiation source accommodation hole 12. Thereby, the handling of the radiation sources 50a and 50b can be simplified, and the handling time of the radiation sources 50a and 50b can be shortened. For this reason, the radiation exposure amount at the time of handling of the radiation sources 50a and 50b of the operator of the radiation sources 50a and 50b can be reduced.

[Second Embodiment]
FIG. 7 is a schematic diagram illustrating a configuration of a radiation source accommodation jig according to the second embodiment. The radiation source accommodation jig according to the second embodiment (hereinafter referred to as “radiation source accommodation jig 3”) is the radiation source accommodation jig of the first embodiment in that the lid portions are provided on both surfaces of the plate-like portion. It is very different from 1. In the following description, elements having substantially the same functions and configurations as those of the radiation source accommodation jig 1 of the first embodiment are denoted by the same reference numerals to avoid redundant description.

  As shown in FIG. 7, the radiation source accommodation jig 3 includes a plate-like portion 31 having a predetermined width and a predetermined length, and four radiation source accommodation portions (hereinafter referred to as “a radiation source accommodation portion 30”). It consists of and.

  One radiation source accommodation portion 30 includes two radiation source accommodation holes (hereinafter referred to as “radiation source accommodation holes 32”), a first lid portion 33, a second lid portion 43, and a first hinge. It comprises a portion 34, a second hinge portion 44, a first locking portion 35, and a second locking portion 45. Hereinafter, elements having functions and configurations different from those of the first embodiment will be mainly described.

  The radiation source accommodation hole 32 is provided so as to penetrate the plate-like portion 31, has a substantially circular first opening 32 a on one surface of the plate-like portion 31, and has a substantially circular first on the other surface of the plate-like portion 31. It has two openings 32b.

  The first lid 33 covers the first opening 32 a of the radiation source accommodation hole 32. A notch 33c is formed at the end (the other end 33b) of the first lid 33 opposite to the first hinge 34. The second lid 43 includes an elastic body 36 on the radiation source accommodation hole 32 side and covers the second opening 32 b of the radiation source accommodation hole 32. A notch 43c is formed at the end (the other end 43b) of the second lid 43 opposite to the second hinge 44.

  The first hinge portion 34 is for attaching one end 33 a of the first lid portion 33 to the plate-like portion 31. By attaching one end 33a of the first lid 33 to the surface of the plate-like portion 31 by the first hinge portion 34, the first lid 33 is opened and closed with the one end 33a of the first lid 33 as a base end. Can be possible.

  The second hinge portion 44 attaches one end 43 a of the second lid portion 43 to the plate-like portion 31. By attaching the one end 43a of the second lid portion 43 to the surface of the plate-like portion 31 by the second hinge portion 44, the second lid portion 43 is opened and closed with the one end 43a of the second lid portion 43 as the base end. Can be possible.

  The first locking portion 35 is for locking the first lid portion 33 to the plate-like portion 31. The first locking portion 35 has a slidable member, and the member is slid in the direction of the closed first lid portion 33 to engage with the notch portion 33c of the first lid portion 33. By doing so, the first lid portion 33 can be locked to the plate-like portion 31.

  The second locking part 45 locks the second lid part 43 to the plate-like part 31. The second locking portion 45 has a slidable member, and the member is slid in the direction of the closed second lid portion 43 to engage with the notch portion 43c of the second lid portion 43. By doing so, the second lid portion 43 can be locked to the plate-like portion 31.

  According to the radiation source accommodation jig 3, when the radiation sources 50a and 50b are accommodated in the radiation source accommodation hole 32, for example, the first lid portion 33 is closed while the second lid portion 43 is opened. After the radiation sources 50a and 50b are accommodated in the radiation source accommodation hole 32 from the second lid portion 43 side, the radiation sources 50a and 50b can be accommodated by closing the second lid portion 43 including the elastic body 36. . That is, after the radiation sources 50a and 50b are accommodated in the radiation source accommodation hole 32, the second lid 43 is closed, so that the elastic force of the elastic body 36 is effectively used to push the radiation sources 50a and 50b. Therefore, the radiation sources 50a and 50b can be easily accommodated.

  When the radiation sources 50a and 50b are taken out from the radiation source accommodation hole 32, when the first lid 33 is opened from the state where the first lid 33 and the second lid 43 are closed, the elastic body The radiation sources 50a and 50b can be taken out by pushing the radiation sources 50a and 50b outward from the radiation source accommodation hole 32 by the elastic force of 36. Thereby, radiation source 50a, 50b can be taken out easily.

  Therefore, the handling of the radiation sources 50a and 50b can be simplified, and the handling time of the radiation sources 50a and 50b can be shortened. For this reason, the radiation exposure amount at the time of handling of the radiation sources 50a and 50b of the operator of the radiation sources 50a and 50b can be reduced.

  Further, when the first lid portion 33 and the second lid portion 43 are closed, the outer surfaces of the plate-like portion 31 and the first lid portion 33 and the plate-like portion 31 and the second lid portion 43 are By forming them so as to be continuous, they can be easily inserted into and removed from the drum-shaped calibration device 70 described later.

  FIG. 8 is a diagram for explaining the arrangement of the drum can-shaped calibration device, and FIG. 8A is a schematic configuration diagram of the upper portion of the drum-shaped calibration device (hereinafter referred to as “calibration device 70” as appropriate). 8 (b) is a partial cross-sectional view of the calibration device 70.

  As shown in FIG. 8, a drum-shaped calibration device 70 is used to calibrate a radiation detector capable of measuring the radioactive concentration, surface contamination density, and surface dose equivalent rate of a drum can in which a radioactive substance is enclosed. The radiation source accommodation jigs 1 and 3 can accommodate the radiation sources 50a and 50b used for calibration of the radiation detector.

  As shown in FIG. 8A, the calibration device 70 has four jig insertion portions 72 at predetermined positions. The four radiation source accommodation jigs 1 and 3 that accommodate the radiation sources 50a and 50b are inserted from jig insertion holes 72a, 72b, 72c, and 72d that are openings of the jig insertion part 72, respectively. Therefore, by using the radiation source accommodation jigs 1 and 3 in this manner, the handling of the radiation sources 50a and 50b can be simplified, and the handling time of the radiation sources 50a and 50b can be shortened. Thereby, the radiation exposure amount at the time of handling of the radiation sources 50a and 50b of the operator of the radiation sources 50a and 50b can be reduced.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention relates to an apparatus for inspecting a radioactive substance, particularly a radiation detector for inspecting a radioactive substance by measuring a radioactive concentration, a surface contamination density, and a surface dose equivalent rate of a drum can encapsulating the radioactive substance in a nuclear power plant. It can be used for a radiation source accommodation jig that accommodates a radiation source used for calibration.

DESCRIPTION OF SYMBOLS 1, 3 ... Radiation source accommodation jig | tool 10, 30 ... Radiation source accommodation part 11, 31 ... Plate-shaped part 12, 32 ... Radiation source accommodation hole 12a ... Opening part 12b ... Bottom part 13, 23 ... Cover part 13a, 33a, 43a ... one end 13b, 23b, 33b, 43b of the lid part ... the other end 14 of the lid part ... hinge part 15 ... slide part (locking part)
15a, 15b ... split slide part 15c ... connection part 15d ... male screw 15e, 15f ... ball plunger 15g ... notch part 15h, 15k ... screw hole 16, 36 ... spring (elastic body)
17 ... Groove 25 ... Locking portion 26 ... Locking tool 32a ... First opening 32b ... Second opening 33 ... First lid 33c, 43c ... Notch 34 ... First hinge 35 ... First One locking part 43 ... second lid part 44 ... second hinge part 45 ... second locking parts 50a and 50b ... radiation source 60 ... reinforcing part 70 ... drum can-shaped calibration device 71 ... drum can 72 ... Tool insertion part 72a, 72b, 72c, 72d ... Jig insertion hole 73 ... Filler

Claims (5)

A plate-like portion having a predetermined width and a predetermined length; and a radiation source containing hole having an opening on one surface of the plate-like portion;
A lid that covers the opening of the radiation source accommodation hole;
A hinge part for attaching the one end to the plate-like part so that the lid part can be opened and closed with one end of the lid part as a base end;
A locking portion for locking the lid portion to the plate-like portion;
A radiation source accommodation jig comprising:   The radiation source accommodation jig according to claim 1, wherein the radiation source accommodation hole includes an elastic body between a bottom portion of the radiation source accommodation hole and the radiation source to be accommodated. The locking portion has a slide portion,
The radiation according to claim 1 or 2, wherein the lid portion is locked to the plate-like portion by sliding the slide portion and locking the other end of the lid portion. Source storage jig. A plate-like portion having a predetermined width and a predetermined length;
A radiation source containing hole provided through the plate-like portion, having a first opening on one surface of the plate-like portion, and having a second opening on the other surface of the plate-like portion;
A first lid that covers the first opening of the radiation source accommodation hole;
An elastic body on the radiation source accommodation hole side; a second lid portion covering the second opening of the radiation source accommodation hole;
A first hinge part for attaching the one end to the plate-like part so that the first cover part can be opened and closed with one end of the first cover part as a base end;
A second hinge part for attaching the one end to the plate-like part so that the second lid part can be opened and closed with one end of the second lid part as a base end;
A first locking portion for locking the first lid portion to the plate-like portion;
A second locking portion for locking the second lid portion to the plate-like portion;
A radiation source accommodation jig comprising:   The radiation source accommodation jig contains a radiation source used for calibration of a radiation detector capable of measuring the radioactivity concentration, surface contamination density, and surface dose equivalent rate of a drum can containing a radioactive substance. The radiation source accommodation jig according to any one of claims 1 to 4, wherein the radiation source accommodation jig is characterized in that: