JP6294740B2 - Light-shielding film repair kit - Google Patents

Description

  The present invention relates to a light shielding film repair kit for a radiation detector, and more particularly to a light shielding film repair kit for repairing a light shielding film in a radiation detector.

  As a radiation measuring apparatus, a survey meter, a body surface monitor, a monitoring post, and the like are known. This radiation measuring apparatus has a radiation detector for detecting radiation. For example, the survey meter includes a measurement unit and a radiation detector. The measurement unit is provided with an arithmetic circuit, a display, an input unit, and the like. The radiation detector is provided with a scintillator member, a photomultiplier tube (PMT), and the like. The scintillator member generates light by the incidence of radiation such as α rays and β rays, and the light is detected by a photomultiplier tube. In order to detect light generated by the scintillator member with high sensitivity, a light blocking structure (dark room) for blocking external light is provided on the back side of the scintillator member, and a light blocking structure is also provided on the front side of the scintillator member. .

  Conventionally, in a radiation detector that detects α-rays and β-rays, one or a plurality of light-shielding films are provided apart from the radiation incident surface of the scintillator member (first light-shielding method). When α-rays and low-energy β-rays have a small range in the air and a light-shielding film having a certain thickness is formed, the shielding and attenuation of radiation in the light-shielding film cannot be ignored, and the measurement sensitivity is greatly reduced. Therefore, in this first light shielding method, an extremely thin light shielding film is generally provided. For example, a very thin aluminized mylar film is used as the light shielding film.

  Patent Document 1 proposes a method (second light shielding method) for forming a light shielding film (light shielding layer) on a scintillator plate using a transfer technique. In the second light shielding method, the scintillator plate functions as a support plate for the light shielding film, and the physical strength of the light shielding film is increased.

JP 2007-147581 A

  In the first light-shielding method and the second light-shielding method, if a scratch or a pinhole is formed in the light-shielding film, light leakage into the radiation detector occurs, the background count value increases, and the scintillator member It becomes difficult to detect the generated weak light emission. In order to cope with this, conventionally, the light-shielding film has been repaired by applying a light-shielding paint to the scratches and pinholes with a brush. When the paint becomes thicker, the attenuation of radiation increases at that portion, so it is necessary to apply the paint thinly. However, it is very difficult and time-consuming to apply the paint uniformly and thinly. In addition, since the paint easily deteriorates over time, there is a problem that light leaks from the deteriorated portion. In other light-shielding methods, the same problem as described above can be pointed out when repairing the light-shielding member.

  An object of the present invention is to enable easy repair of a light shielding film provided in a radiation detector. Or the objective of this invention is making workability | operativity favorable in repair work of a light shielding film. Alternatively, an object of the present invention is to reduce waste in repairing a light shielding film.

  The present invention is a light-shielding film repair kit for repairing a light-shielding film in a radiation detector, and includes a base sheet, a patch member with a tag that is detachably provided on the upper surface of the base sheet, and an upper surface of the base sheet A tag-less patch member provided in a peelable manner, and the tag-attached patch member is attached to the first patch for repairing the light shielding film and to the upper surface of the first patch in a peelable manner. A tag having a holding portion and an operation portion picked up by a repair worker, wherein the patch member without a tag includes an upper surface to which the tag peeled off from the first patch is attached, and the light shielding film Including a second patch for repairing.

  In the above configuration, the first patch and the second patch function as a sealing member having a light shielding layer, and are attached to a portion where a scratch, a pinhole, or the like is formed in the light shielding film. Thereby, the light shielding film is repaired. For example, the patch member with the tag is peeled off from the base sheet, and the first patch provided on the tag member with the tag is attached to the repaired part of the light shielding film (the part where the scratch or the pinhole is formed). Remove the tag. As a result, the first patch is attached to the repair location, and the light shielding film is repaired. Further, the tag peeled from the first patch can be reused. In this case, the tag is pressed against the second patch, and the second patch is attached to the tag. Then, in a state where the second patch is attached to the tag, the second patch is peeled from the base sheet. Thus, a new tagged patch member is formed by the tag and the second patch. For example, when a plurality of patches are stuck and pasted, or when a patch is stuck at a plurality of locations, a tagged patch member may be formed by the tag and the second patch. Thus, the tagged patch member and the untagged patch member are used as one set. The shape and size of the first patch may be the same as or different from the shape and size of the second patch. For example, the first patch and the second patch having the same shape and size may be handled as the same set. A plurality of types of sets may be provided on the base sheet. For example, a plurality of sets having different sizes and shapes of the first patch and the second patch may be provided on the base sheet. According to the above configuration, since a plurality of patches can be attached to the light shielding film using a single tag, that is, they can be used in combination, compared with a case where a single tag is provided for each individual patch. For example, the size of the base sheet can be reduced, or the amount of waste can be reduced. Moreover, since the single tag currently held in the hand can be used as it is and the next repair work can be quickly performed, the repair workability can be improved.

  When specifying the position of the repair location, a tagged patch member can be used. For example, when a scratch or a pinhole is formed in the light shielding film, light leakage occurs there, and the background count value of the radiation detector becomes high. The patch (the first patch or the second patch) of the tagged patch member is held over the surface of the light shielding film, and a place where a flaw, a pinhole or the like is formed is searched. When a spot where a flaw, a pinhole or the like is formed is covered with a patch, light transmission is blocked by the patch and the count value is lowered. A place where the count value falls corresponds to a place where a scratch or a pinhole is formed. In this way, the tagged patch member can be used for searching for repair locations. After the search, by pasting the patch as it is to the repair location, the operations from the search to the patch application can be performed continuously.

  Preferably, the first patch and the second patch are detachably attached to the upper surface of the base sheet, and the adhesive force between the first patch and the tag is the first patch and the tag. It is stronger than the adhesive force between the base sheet and the adhesive force between the second patch and the tag is stronger than the adhesive force between the second patch and the base sheet. Thereby, it can peel from a base sheet in the state which affixed the 1st patch or the 2nd patch on the tag.

  Preferably, a plurality of tagged patch members are provided to form a first row, a plurality of non-tagged patch members are provided to form a second row, and the second row is arranged in the first row. The columns are arranged.

  Desirably, a plurality of tagged patch members are arranged across the untagged patch member.

  Desirably, the tag is disposed with the operation portion facing the outside of the base sheet. For example, the first patch and the second patch are arranged in an area inside the base sheet, and the tag is arranged in an area outside the base sheet. As a result, a tag (a portion where the first patch is not attached) is arranged in the peripheral portion of the base sheet. The operator can peel the tagged patch member or the untagged patch member from the base sheet while pressing the peripheral portion of the base sheet (the place where the tag is disposed). Thereby, the operator can peel easily the patch member with a tag or the patch member without a tag from a base sheet, without contacting a 1st patch and a 2nd patch.

  According to the present invention, in a radiation detector using a light shielding film, the light shielding film can be easily repaired.

It is a top view which shows the light shielding film repair kit which concerns on embodiment of this invention. It is sectional drawing of a patch member without a tag. It is sectional drawing of a patch member with a tag. It is sectional drawing of a patch member with a tag. It is sectional drawing of a patch member without a tag and a tag. It is a disassembled perspective view of a radiation detector. It is a perspective view of a scintillator member. It is sectional drawing of a radiation detector. It is a fragmentary sectional view of a radiation detector. It is a figure for demonstrating the repair method of a light shielding film. It is a top view which shows the light shielding film repair kit which concerns on this embodiment. It is a top view which shows the light shielding film repair kit which concerns on this embodiment. It is a disassembled perspective view of another example of a radiation detector. It is sectional drawing of another example of a radiation detector. It is a fragmentary sectional view of another example of a radiation detector. It is a top view which shows the light shielding film repair kit which concerns on a modification.

  FIG. 1 shows a light-shielding film repair kit according to this embodiment. The light shielding film repair kit 10 is used for repairing the light shielding film provided in the radiation detector, as will be described later.

  The base sheet 12 is a sheet-like transparent resin film (release film). A plurality of untagged patch members 14 and 30 and a plurality of tagged patch members 22 and 34 are attached to the surface of the base sheet 12.

  The untagged patch members 14 and 30 are repair patches (seal members) having a light shielding layer. The untagged patch members 14 and 30 are peeled off from the base sheet 12 and attached to locations where scratches or pinholes are formed in the light shielding film. Thereby, the light shielding film is repaired. As an example, the untagged patch members 14 and 30 have a circular shape. The untagged patch member 30 is larger than the untagged patch member 14. As an example, the untagged patch member 14 has a diameter of about 5 mm, and the untagged patch member 30 has a diameter of about 8 mm. The shape of the untagged patch members 14 and 30 is not limited to a circle, and may be a rectangle or an ellipse.

  The plurality of untagged patch members 14 are arranged in the X direction at intervals in the central area (Y direction inner area) of the base sheet 12. A plurality of untagged patch members 14 constitute a untagged patch member group 16. Similarly, the plurality of untagged patch members 30 are arranged in the X direction at intervals in the central area (Y direction inner area) of the base sheet 12. A plurality of untagged patch members 30 constitutes a untagged patch member group 32. As an example, a plurality of untagged patch members 14 are arranged in three rows, and a plurality of untagged patch members 30 are arranged next to each other in two rows. The number of rows of the untagged patch members 14 and 30 is an example, and rows other than the number of rows shown in FIG. 1 may be formed. For example, the number of columns may be one. The number of untagged patch members 14 may be one. Accordingly, it is sufficient that one or a plurality of untagged patch members 14 are provided on the base sheet 12. Similarly, the number of untagged patch members 30 may be one. Therefore, it is sufficient that one or a plurality of untagged patch members 30 are provided on the base sheet 12.

  The tagged patch member 22 includes a repair patch 24 and a tag 26 having an elongated shape. The repair patch 24 is provided at the tip of the tag 26. The repair patch 24 has the same configuration, shape, and size as the untagged patch member 14. Accordingly, the tag-less patch member 14 attached to the tip of the tag 26 corresponds to the tagged patch member 22. The plurality of patch members 22 with tags are arranged in the X direction at intervals from each other next to the plurality of patch members 14 without tags. As an example, the plurality of tagged patch members 22 are arranged in a line. The plurality of tagged patch members 22 are arranged in the outer area (Y direction outer area) than the plurality of untagged patch members 14 in the base sheet 12. At this time, the tagged patch member 22 is disposed with the repair patch 24 facing the inside of the base sheet 12. As a result, the tag 26 is arranged in a region outside the tagless patch member 14 in the base sheet 12. As an example, the length in the short direction of the tag 26 is about 8 mm, and the length in the longitudinal direction is about 40 mm. The tip of the tag 26 may have a tapered shape in accordance with the size of the repair patch 24. The number of tagged patch members 22 may be one. Therefore, it is sufficient that one or a plurality of tagged patch members 22 are provided on the base sheet 12.

  The tagged patch member 34 includes a repair patch 36 and a tag 38 having an elongated shape. The repair patch 36 is provided at the tip of the tag 38. The repair patch 36 has the same configuration, shape, and size as the untagged patch member 30. Accordingly, the tag-less patch member 30 attached to the tip of the tag 38 corresponds to the tagged patch member 34. The plurality of tagged patch members 34 are arranged in the X direction at intervals from each other next to the plurality of untagged patch members 30. As an example, the plurality of tagged patch members 34 are arranged in a line. The plurality of tagged patch members 34 are arranged in the outer area (Y direction outer area) of the base sheet 12 than the plurality of untagged patch members 30. At this time, the tagged patch member 34 is arranged with the repair patch 36 facing the inside of the base sheet 12. As a result, the tag 38 is arranged in a region outside the tagless patch member 30 in the base sheet 12. As an example, the length of the tag 38 in the short direction is about 8 mm, and the length in the long direction is about 40 mm. The number of tagged patch members 34 may be one. Accordingly, it is sufficient that one or a plurality of tagged patch members 34 are provided on the base sheet 12.

  As described above, the untagged patch members 14 and 30, the tagged patch member 22 in which the repair patch 24 and the tag 26 are integrated, and the tagged patch member 34 in which the repair patch 36 and the tag 38 are integrated. Is affixed to the surface of the base sheet 12. The plurality of untagged patch members 14 and 30 are disposed between the plurality of tagged patch members 22 and the plurality of tagged patch members 34. Further, the tags 26 and 38 are arranged in an area outside the tagless patch members 14 and 30 in the base sheet 12.

  In this embodiment, the untagged patch member 14 and the tagged patch member 22 are provided as one set (first repair set), and the untagged patch member 30 and the tagged patch member 34 are provided as one set (second repair set). ). In the example shown in FIG. 1, two types of sets are provided. Both sets constitute a substantially symmetrical arrangement with the center line in the Y direction as a boundary. That is, a plurality of first repair sets are arranged in the X direction in the Y-direction lower area, and a plurality of second repair sets are arranged in the X direction in the Y-direction upper area. One type of set may be provided. For example, one or a plurality of untagged patch members 14 and one or a plurality of tagged patch members 22 are provided on the base sheet 12, and the untagged patch member 30 and the tagged patch member 34 are provided on the base sheet 12. It does not have to be. In contrast, one or more untagged patch members 30 and one or more tagged patch members 34 are provided on the base sheet 12, and the untagged patch member 14 and tagged patch member 22 are provided on the base sheet 12. May not be provided. In addition, three or more types of sets (the untagged patch member and the tagged patch member) having different sizes of the light shielding patch may be provided on the base sheet 12.

  As another example, a plurality of types of sets having different shapes of light shielding patches may be provided on the base sheet 12.

  FIG. 2 shows a cross section of the untagged patch member 14. The untagged patch member 14 is composed of a light shielding layer 18 that blocks light transmission and a first adhesive material 20 provided on the back side of the light shielding layer. The light shielding layer 18 and the first adhesive material 20 are firmly bonded and integrated. The untagged patch member 14 is detachably attached to the surface of the base sheet 12 by the first adhesive material 20.

  The light shielding layer 18 is a resin film having a light shielding function. As an example, the light shielding layer 18 is made of a black polyethylene terephthalate (PET) film. The thickness of the light shielding layer 18 is set within a range of 20 to 30 μm, for example, and is preferably 25 μm.

  The first adhesive material 20 is a colored adhesive material (for example, an acrylic colored adhesive material). In order to enhance the light blocking function, the color of the first adhesive material 20 is desirably black. The thickness of the 1st adhesive material 20 is set in the range of 20-30 micrometers, for example, It is 25 micrometers desirably.

  The untagged patch member 30 has the same configuration as the untagged patch member 14 (the light shielding layer 18 and the first adhesive material 20).

  FIG. 3 shows a cross section of the tagged patch member 22. The tagged patch member 22 includes a repair patch 24, a tag 26, and a second adhesive material 28. The tagged patch member 22 is detachably attached to the surface of the base sheet 12 by the first adhesive material 20.

  The repair patch 24 has the same configuration as the untagged patch member 14 shown in FIG. That is, the repair patch 24 includes the light shielding layer 18 and the first adhesive material 20. The light shielding layer 18 and the first adhesive material 20 are firmly bonded and integrated.

  The tag 26 is a transparent resin film (release film). The tip portion (corresponding to the holding portion) of the tag 26 is detachably attached to the surface side of the light shielding layer 18 by the second adhesive material 28. That is, the tip of the tag 26 is detachably attached to the repair patch 24 by the second adhesive material 28. A portion of the tag 26 where the repair patch 24 is not attached constitutes an operation unit picked up by an operator. This operation part may be affixed to the base sheet 12 so that peeling is possible.

  In the present embodiment, the adhesive force between the repair patch 24 and the tag 26 is stronger than the adhesive force between the repair patch 24 and the base sheet 12. Further, the light shielding layer 18 and the first adhesive material 20 are firmly bonded and integrated, and the adhesive force between the light shielding layer 18 and the first adhesive material 20 is between the repair patch 24 and the tag 26. It is stronger than the adhesive strength.

  This point will be described in more detail. Here, the interface between the base sheet 12 and the first adhesive material 20 is referred to as a “first interface”, the interface between the first adhesive material 20 and the light shielding layer 18 is referred to as a “second interface”, and the light shielding layer 18 and the second adhesive. The interface with the material 28 is referred to as a “third interface”, the interface between the second adhesive material 28 and the tag 26 is referred to as a “fourth interface”, and the interface between the light shielding film and the first adhesive material 20 described later is referred to as a “first interface”. 5 interfaces ". In this embodiment, the adhesive force of the second interface is the strongest. Moreover, the adhesive force of the 3rd interface and the 4th interface is stronger than the 1st interface. Further, the adhesive force of the fourth interface is stronger than that of the third interface. That is, for the adhesive strength (adhesive strength), the relationship of the second interface> the fourth interface> the third interface> the first interface is established. Further, the adhesive force of the fifth interface is stronger than that of the third interface. That is, the relationship of the fifth interface> the third interface is established for the adhesive force.

  The tagged patch member 34 has the same configuration as the tagged patch member 22. Specifically, the tip of the tag 38 is detachably attached to the repair patch 36 by the second adhesive material 28.

  FIG. 4 shows a state where the tagged patch member 22 is peeled from the base sheet 12. For example, as shown in FIG. 4A, when the operation part of the tag 26 is pulled up above the base sheet 12, the part having the weakest adhesive force peels off. That is, as shown in FIG. 4B, the repair patch 24 is peeled off from the base sheet 12. Accordingly, the tagged patch member 22 can be peeled off from the base sheet 12 with the repair patch 24 attached to the tag 26.

  The tagged patch member 22 peeled from the base sheet 12 is used for repairing the light shielding film of the radiation detector. For example, the operator attaches the repair patch 24 to the repaired portion of the light shielding film while holding the tag 26. The repair patch 24 is attached to the light shielding film by the first adhesive material 20. Then, the operator peels off the tag 26 from the repair patch 24. At this time, the adhesive force at the interface (fifth interface) between the light-shielding film and the first adhesive material 20 is stronger than the adhesive force at the interface (third interface) between the light-shielding layer 18 and the second adhesive material 28. By pulling up 26 from the repair patch 24, the light shielding layer 18 and the second adhesive material 28 are peeled in a state where the repair patch 24 is attached to the light shielding film. Thereby, the tag 26 can be peeled from the repair patch 24 in a state where the repair patch 24 is attached to the light shielding film. In this way, the light shielding film is repaired. Further, since the adhesive force at the interface (fourth interface) between the second adhesive material 28 and the tag 26 is stronger than the adhesive force at the third interface, when the tag 26 is peeled off from the repair patch 24, the tip of the tag 26 ( The second adhesive material 28 remains in the portion where the repair patch 24 has been applied. A specific method for repairing the light shielding film will be described in detail later.

  In the present embodiment, the tag 26 from which the repair patch 24 is peeled can be reused. The tagless patch member 14 is affixed to the base sheet 12 for reuse.

  Here, a method of reusing the tag 26 will be described with reference to FIG. FIG. 5 shows a cross section of the untagged patch member 14 and the tag 26. As shown in FIG. 5A, the tip portion of the tag 26 (the portion where the second adhesive material 28 remains) is pressed against the tagless patch member 14 provided on the base sheet 12. In this state, as shown in FIG. 5B, the tip of the tag 26 is pressed from above, and the tagless patch member 14 is attached to the tip of the tag 26 by the second adhesive material 28. Then, the operation unit of the tag 26 is pulled up above the base sheet 12. Thereby, as shown in FIG.5 (c), in the state which stuck the patch member 14 without a tag to the front-end | tip part of the tag 26, it can peel from the base sheet 12. FIG. That is, by attaching the untagged patch member 14 to the tag 26, a new tagged patch member 22 is formed. Using this patch member 22 with a tag, the tag member 14 without a tag can be affixed to the repair location of a light shielding film.

  The tagged patch member 34 is also peeled off from the base sheet 12 in the same manner as the tagged patch member 22, and the repair patch 36 is attached to the repaired portion of the light shielding film. Then, by attaching the tag-free patch member 30 to the tag 38 from which the repair patch 36 has been peeled off, a new tagged patch member 34 is formed.

  Next, a radiation detector provided with a light shielding film will be described with reference to FIGS. For example, a survey meter as a radiation measurement apparatus includes a portable detection probe (radiation detector) and a measurement unit having an arithmetic circuit, a display, an input unit, and the like. An example of the detection probe is shown in FIGS. This detection probe is mainly used for detecting β rays.

  FIG. 6 shows an exploded perspective view of the detection probe. In the detection probe, a scintillator member 42 is installed in the main body case 40. A packing 44 having a frame shape is provided over the entire periphery of the scintillator member 42. The packing 44 is a light shielding member. The packing 44 is made of an elastic member such as rubber. A rectangular protective cover 46 is attached to the main body case 40 with screws 48. In the coupled state of the main body case 40 and the protective cover 46, the scintillator member 42 provided inside the main body case 40 is held and fixed. The protective cover 46 is an eye plate or a lattice member and has a function of protecting the scintillator member 42.

  FIG. 7 shows the scintillator member 42. The scintillator member 42 has the same configuration as that of the scintillator member described in Patent Document 1. That is, the scintillator member 42 includes a back plate 42a such as a transparent acrylic plate, a scintillator plate 42b (plastic scintillator), and a light shielding film 42c that transmits radiation and blocks light transmission. The back plate 42a and the scintillator plate 42b have a flat plate shape. The light shielding film 42c is formed on the radiation incident surface of the scintillator plate 42b. The scintillator plate 42b corresponds to a scintillator plate integrated with a light shielding film. The back plate 42a is provided on the back surface of the scintillator plate 42b (the surface opposite to the light shielding film 42c). The light shielding film 42c includes an adhesive layer, an aluminum vapor deposition layer (light shielding layer), and a protective layer when viewed from the scintillator plate 42b side. The thickness of the adhesive layer is, for example, about 1 to 3.0 μm. The thickness of the aluminum vapor deposition layer is, for example, about 0.01 to 1.5 μm. The thickness of the protective layer is, for example, about 0.5 to 3.0 μm. The thickness of the scintillator plate 42b is, for example, about 0.5 to 2.0 mm. A plurality of light shielding films 42c may be formed. The light shielding film 42c is formed by, for example, a thermal transfer method. The light shielding film 42c may be formed by other techniques.

  FIG. 8 shows a cross section of the detection probe. The main body case 40 accommodates a scintillator member 42, a photomultiplier tube 52 (PMT), an electronic circuit, and the like. The inside of the main body case 40 is a cavity 50, and the cavity 50 constitutes a dark room. A photomultiplier tube 52 is provided on the upper part of the main body case 40, and the light receiving surface of the photomultiplier tube 52 faces the cavity 50.

  FIG. 9 shows a partial cross-sectional view of a portion A surrounded by a broken line in FIG. In FIG. 9, the illustration of the light shielding film 42c is omitted. When viewed from the scintillator plate 42b, the back plate 42a is disposed inside the main body case 40, and the light shielding film 42c is disposed outside.

  As shown in FIG. 8, when the radiation 54 comes from the outside, the radiation passes through the light shielding film 42c in the scintillator member 42 and reaches the scintillator plate 42b. The light 56 generated by the scintillator plate 42 b passes through the transparent back plate 42 a and reaches the cavity 50 in the main body case 40. When the light 56 reaches the photomultiplier tube 52, the light 56 is converted into an electric signal in the photomultiplier tube 52. Since the light shielding film 42c is formed on the scintillator member 42, light entry from the outside is prevented by the light shielding film 42c.

  If scratches, pinholes, or the like are formed in the light shielding film 42c formed on the scintillator member 42, light leaks into the main body case 40 at that portion, and the background count value becomes higher than usual. In this case, the light shielding film 42c can be repaired using the light shielding film repair kit 10 of the present embodiment.

  Hereinafter, a light shielding film repair method using the light shielding film repair kit 10 will be described. When repairing the light-shielding film 42c, it is necessary to specify a location (repair location) where a scratch, a pinhole or the like is formed. As an example, the rough position of the repair location is specified according to the following procedure. First, turn on the survey meter and put it into the measurement state. The worker covers the detection surface (scintillator member 42) of the detection probe with a dark curtain so that light does not enter the detection probe, and gradually shifts the dark curtain. At this time, the detection surface exposed from the dark screen may be irradiated with light from the light source. There is a possibility that light leakage has occurred in the part where the count value of the survey meter increases as the dark curtain is shifted little by little. By this work, the rough position of the repair location is specified. Next, using the light-shielding film repair kit 10, the detailed position of the repair location is specified, and the light-shielding film is repaired.

  A specific example of the light shielding film repair method using the light shielding film repair kit 10 will be described with reference to FIGS. For convenience of explanation, only the scintillator member 42 (back plate 42a, scintillator plate 42b, light shielding film 42c) is shown in FIG. 10, but the light shielding film 42c is repaired without disassembling the inspection probe. 40 with the protective cover 46 attached. Therefore, actually, the protective cover 46 exists above the light shielding film 42c. As shown in FIG. 10A, as an example, repair sites 58a, 58b, and 58c such as scratches and pinholes are formed on the light shielding film 42c of the scintillator member 42.

  First, as shown in FIG. 11, the operator removes the tagged patch member 22 from the base sheet 12 by grasping the tag 26. As described above, since the adhesive force at the interface (first interface) between the base sheet 12 and the first adhesive material 20 is weaker than the adhesive force at the second to fourth interfaces, the repair patch 24 is attached to the tag 26. In this state, the tagged patch member 22 can be peeled from the base sheet 12. At this time, the operator selects either the tagged patch member 22 to which the small repair patch 24 is affixed or the tagged patch member 34 to which the large repair patch 36 is affixed according to the size of the repair location. do it. Here, as an example, it is assumed that the tagged patch member 22 is selected.

  Then, the survey meter is set in the measurement state, and as shown in FIG. 10B, the operator holds the tag 26 and holds the repair patch 24 of the patch member 22 with the tag over the surface of the scintillator member 42. By changing the position of the repair patch 24 on the surface of the scintillator member 42, the local position of the light leakage portion (repair portion) is searched. The protective cover 46 provided above the scintillator member 42 is an eye plate or a lattice member. Therefore, the operator inserts the tagged patch member 22 into the inside of the protective cover 46 through the gap of the protective cover 46 (gap of the eye plate or lattice), and in that state, holds the repair patch 24 over the surface of the scintillator member 42. The position of the repaired part can be searched. When the rough position of the repair location is specified, the operator may search the detailed location of the repair location by holding the repair patch 24 around the location and the periphery. For example, when the repair location 58a is covered with the repair patch 24, light leakage from the repair location 58a (light entering the scintillator plate 42b from the repair location 58a) is prevented by the repair patch 24. Go down. Thereby, the detailed position of the repair location 58a is specified.

  When the detailed position of the repair location 58a is specified, as shown in FIG. 10C, the operator places the repair patch 24 at the repair location 58a and presses the repair patch 24 from above to the repair location 58a. paste. Since the first adhesive material 20 is provided in the repair patch 24, the repair patch 24 is attached to the repair location 58a by the adhesive force of the first adhesive material 20. Thereafter, the operator peels the tag 26 from the repair patch 24 by pulling the gripping portion of the tag 26 upward. As described above, the adhesive force at the interface (fifth interface) between the light shielding film 42c and the first adhesive material 20 is stronger than the adhesive force at the interface (third interface) between the light shielding layer 18 and the second adhesive material 28. Therefore, by pulling up the tag 26 from the repair patch 24, the tag 26 can be peeled from the repair patch 24 in a state where the repair patch 24 is attached to the light shielding film 42c. Accordingly, as shown in FIG. 10D, the repair patch 24 is attached to the repair portion 58a of the light shielding film 42c. Further, since the adhesive force at the interface (fourth interface) between the second adhesive material 28 and the tag 26 is stronger than the adhesive force at the third interface, when the tag 26 is peeled off from the repair patch 24, the tip of the tag 26 ( The second adhesive material 28 remains in the portion where the repair patch 24 has been applied.

  When a repair patch is subsequently attached to another repair location, the tag 26 from which the repair patch 24 has been removed is reused as a jig. In this case, as shown in FIG. 12, the tip of the tag 26 (the portion where the repair patch 24 has been attached) is pressed against the untagged patch member 14, and the tag-less patch member 14 is attached to the tip of the tag 26. wear. The second adhesive material 28 remains at the tip of the tag 26 (the portion where the repair patch 24 has been attached). The tagless patch member 14 is attached to the tip of the tag 26 by the second adhesive material 28. Then, by pulling the tag 26 above the base sheet 12, the tagless patch member 14 is peeled from the base sheet 12 in a state where the tag-less patch member 14 is attached to the tip end portion of the tag 26. As a result, a new tagged patch member 22 is formed.

  Then, as shown in FIG. 10 (e), the operator holds the repair patch of the tagged patch member 22 (the untagged patch member 14) over the surface of the scintillator member 42 and searches the detailed position of the repair location. . It is assumed that the position of the repair location 58b is specified by this search. In this case, the operator attaches the untagged patch member 14 to the repaired portion 58 b and peels the tag 26 from the untagged patch member 14. Thereby, as shown in FIG. 10F, the untagged patch member 14 is affixed to the repaired portion 58b of the light shielding film 42c.

  Furthermore, the repair patch can be pasted on the repair site 58c by reusing the tag 26 from which the repair patch has been removed. In addition, when the adhesive force of the 2nd adhesive material 28 provided in the front-end | tip part of the tag 26 falls, what is necessary is just to peel and use another patch member 22 with a tag from the base sheet 12. FIG.

  Further, a plurality of repair patches may be overlaid on the same repair location. Also in this case, the repair patch can be pasted on the repair site by reusing the tag 26 from which the repair patch has been removed.

  After applying the repair patch, the count value is confirmed, and it is confirmed whether the count value is lowered to the background level (the level when the entire detection probe is covered with a dark screen). If the count does not drop to that level, repairs may be incomplete. In this case, it is confirmed that the count value is lowered to the background level by overlaying a repair patch or adding another repair patch around the repair patch that was first pasted. If the count value drops to the background level, the repair is complete.

  As described above, in the present embodiment, the light shielding film 42c can be repaired by attaching the repair patches 24, 36 or the untagged patch members 14, 30 to the repair location. Thereby, since it is not necessary to apply paint to the light shielding film 42c with a brush, the light shielding film 42c can be repaired easily.

  The operator can handle the tagged patch members 22 and 34 by holding the tags 26 and 38. Thereby, handling of the patch members 22 and 34 with a tag becomes easy.

  Further, using the tagged patch members 22 and 34, it is possible to search the detailed position of the repaired portion. After the search, the repair patches 24 and 36 or the untagged patch members 14 and 30 can be pasted to the repair site as they are. As described above, the operations from the search for the repair location to the pasting of the repair patch can be easily performed continuously.

  In addition, the tags 26 and 38 can be reused, and the new tagged patch members 22 and 34 can be created by the untagged patch members 14 and 30 and the tags 26 and 38. Thereby, compared with the case where only the patch members 22 and 34 with a tag are provided in the base sheet 12, the space of the base sheet 12 can be utilized efficiently. That is, by providing the untagged patch members 14 and 30 on the base sheet 12, more repair patches can be provided on the base sheet 12 for use. In addition, by reusing the tags 26 and 38, the discard amount of the tags 26 and 38 can be reduced.

  Further, the tags 26 and 38 are arranged in an outer region (peripheral portion) in the base sheet 12. The operator can peel the tagged patch members 22 and 34 from the base sheet 12 while holding the base sheet 12 by placing a hand on the area where the tags 26 and 38 are disposed. That is, since the outer area of the base sheet 12 is a non-adhesive area (an area without a repair patch) and the inner area is an adhesive area (an area where a repair patch is provided), the tagged patch members 22 and 34 are attached to the base sheet 12. When it peels from, the space for pressing down the both sides of the Y direction of the peeling position is fully ensured. Thereby, it is possible to prevent the base sheet 12 from being turned over, and to easily peel off the patch members 22 and 34 with tags from the base sheet 12. Further, the operator can peel off the tagged patch members 22 and 34 from the base sheet 12 without contacting the repair patches 24 and 36 and the untagged patch members 14 and 30.

  In addition, since three or two untagged patch members are arranged in association with tagged patch members, the number of tag reuses (remaining number of times up to the upper limit of the reference) is visually recognized when untagged patch members are used in order. It becomes possible to do.

  Next, another detection probe will be described with reference to FIGS. In this detection probe, a scintillator plate with an integrated light shielding film is not used, and a mylar film is used as the light shielding film. This detection probe is mainly used for detecting α rays and β rays.

  FIG. 13 shows an exploded perspective view of the detection probe. In the detection probe, a scintillator plate 72 (plastic scintillator) is installed in the main body case 70. Further, a packing 74 having a frame shape is provided over the entire periphery of the scintillator plate 72. The packing 74 is a light shielding member. The packing 74 is made of an elastic member such as rubber. A light shielding film 78 that transmits radiation and blocks light transmission is provided apart from the radiation incident surface of the scintillator plate 72. The light shielding film 78 is, for example, an aluminized mylar film, and is attached to the lattice-shaped frame 76. A plurality of light shielding films 78 may be attached to the frame body 76. In FIG. 13, in order to clearly show the light shielding film 78, a part of the light shielding film 78 is folded back. A rectangular protective cover 80 is attached to the main body case 70 with screws 82. In the coupled state of the main body case 70 and the protective cover 80, the scintillator plate 72 provided inside the main body case 70 is held and fixed. The protective cover 80 is an eye plate or a lattice member, and has a function of protecting the scintillator plate 72 and the light shielding film 78.

  FIG. 14 shows a cross section of the detection probe. The main body case 70 accommodates a scintillator plate 72, a photomultiplier tube 86 (PMT), an electronic circuit, and the like. The inside of the main body case 70 is a cavity 84, and the cavity 84 constitutes a dark room. A photomultiplier tube 86 is provided on the upper part of the main body case 70, and the light receiving surface of the photomultiplier tube 86 faces the cavity 84.

  FIG. 15 is a partial cross-sectional view of a portion B surrounded by a broken line in FIG. When viewed from the scintillator plate 72, the light shielding film 78 is disposed outside the main body case 70.

  As shown in FIG. 14, when the radiation 88 comes from the outside, the radiation 88 passes through the light shielding film 78 and reaches the scintillator plate 72, and the generated light 90 reaches the cavity 84 in the main body case 70. To do. When the light 90 reaches the photomultiplier tube 86, the light 90 is converted into an electric signal in the photomultiplier tube 86. Since the light shielding film 78 is provided, the light shielding film 78 prevents light from entering from the outside.

  Even when the light shielding film 78 is formed of a mylar film as described above, the light shielding film 78 can be repaired by using the light shielding film repair kit 10 of the present embodiment. The procedure of the repair method is the same as the procedure described with reference to FIGS.

  Moreover, when repairing the light shielding film of the radiation detector provided with the GM tube (Geiger-Muller tube), the light shielding film repair kit 10 of this embodiment may be used.

  Next, a light shielding film repair kit according to a modification will be described with reference to FIG. A light-shielding film repair kit 100 according to a modification includes a base sheet 102 that is a sheet-like transparent resin film (peeling film), and a plurality of tagged patch members 104 attached to the surface of the base sheet 102. .

  The tagged patch member 104 includes a repair patch 106 having an elongated shape and a tag 108 having an elongated shape. The repair patch 106 is affixed to the tip of the tag 108.

  The configurations and materials of the repair patch 106 and the tag 108 are the same as those of the repair patch 24 and the tag 26 described above. That is, the repair patch 106 includes a light shielding layer and a first adhesive material, and is attached to the surface of the base sheet 102 by the first adhesive material. The tip of the tag 26 is affixed to the repair patch 106 with a second adhesive material.

  The plurality of tagged patch members 104 are arranged in the X direction at intervals. As an example, the plurality of tagged patch members 104 are arranged in two rows. At this time, the tagged patch member 104 is arranged with the repair patch 106 facing the inner side (center side) of the base sheet 102. As a result, the tag 108 is arranged in an area outside the repair patch 106 in the base sheet 102. In the present embodiment, the plurality of tagged patch members 104 form a substantially symmetric arrangement with respect to the center line in the Y direction.

  In the example illustrated in FIG. 16, the single repair patch 106 without the tag 108 is not attached to the base sheet 102, but the single repair patch 106 is not attached to the base sheet 102 as in the above-described embodiment. It may be affixed to.

  Since the repair patch 106 has an elongated shape, the repair patch 106 is used, for example, when repairing a linear scratch formed on the light shielding film. The method of using the light shielding film repair kit 100 is the same as that of the light shielding film repair kit 10 according to the above-described embodiment. That is, the operator grasps a portion (operation unit) where the repair patch 106 is not affixed on the tag 108 and lifts the tag 108 upward. Thus, the tagged patch member 104 can be peeled off from the base sheet 102 with the repair patch 106 attached to the tag 108. Then, the repair patch 106 is attached to the repair site, and the tag 108 is peeled off from the repair patch 106. Thereby, the light shielding film is repaired.

  As described above, the light-shielding film can be easily repaired by attaching the repair patch 106 to the repair site. Further, by providing the tag 108, the tagged patch member 104 can be easily handled. Further, using the tagged patch member 104, it is possible to search the detailed position of the repaired portion. Further, the tag 108 is disposed in the outer region of the base sheet 102. Therefore, the operator can easily peel the tagged patch member 104 from the base sheet 102 while pressing the base sheet 102 by placing a hand on the area where the tag 108 is disposed.

  10,100 Light shielding film repair kit, 12,102 Base sheet, 14,30 Patch member without tag, 16,32 Patch member group without tag, 18 Light shielding layer, 20 First adhesive material, 22, 34, 104 Patch member with tag 24, 36, 106 Repair patch, 26, 38, 108 Tag, 28 Second adhesive material, 40, 70 Main body case, 42 Scintillator member, 42a Back plate, 42b, 72 Scintillator plate, 42c, 78 Light-shielding film, 44, 74 Packing, 46, 80 Protective cover, 48, 82 Screw, 76 Frame.

Claims (5)

A light shielding film repair kit for repairing a light shielding film in a radiation detector,
A base sheet,
A patch member with a tag that is detachably provided on the upper surface of the base sheet;
A tag-free patch member removably provided on the upper surface of the base sheet;
Including
The tagged patch member is
A first patch for repairing the light shielding film;
A tag having a holding part detachably attached to the upper surface of the first patch, and an operation part picked by a repair worker;
Including
The tagless patch member includes an upper surface to which the tag peeled off from the first patch is attached, and includes a second patch for repairing the light shielding film,
A light-shielding film repair kit. In the light-shielding film repair kit according to claim 1,
The first patch and the second patch are detachably attached to the upper surface of the base sheet,
The adhesive force between the first patch and the tag is stronger than the adhesive force between the first patch and the base sheet,
The adhesive force between the second patch and the tag is stronger than the adhesive force between the second patch and the base sheet,
A light-shielding film repair kit. In the light-shielding film repair kit according to claim 1 or 2,
A plurality of the tagged patch members are provided to constitute the first row,
A plurality of the untagged patch members are provided to constitute the second row,
The second row is arranged alongside the first row,
A light-shielding film repair kit. In the light-shielding film repair kit according to claim 3,
A plurality of tagged patch members are arranged across the untagged patch member,
A light-shielding film repair kit. In the light-shielding film repair kit according to claim 3 or claim 4,
The tagged patch member and the untagged patch member are arranged so that the first patch is arranged between the untagged patch member and the tag ,
A light-shielding film repair kit.