JP2008256479A - Manufacturing method for partition reflection plate and radiation detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a partition reflection plate manufacturing method and a radiation detector capable of enhancing detection accuracy in radiation detection. <P>SOLUTION: This method is a method for manufacturing a partition reflection plate having a reflection plate body composed of an optical film having elasticity and light reflecting properties, and a plurality of slits formed at intervals in the reflection plate body. A plurality of housing sections for housing scintillators can be formed by combining a plurality of such partition reflection plates so that their slits engage with each other, and the method has a cutting step of forming the slits by cutting the optical film with a cutting blade. The cutting blade has an acute cutting tip part 13, and a blade edge part 12 stretching along the side surfaces from the tip part 13. In the partition reflection plate manufacturing method, the cutting step has a stabbing step of rupturing the optical film by stabbing the tip part 13 into a rupturing position of the optical film to rupture the optical film, and a moving step of moving the cutting blade so as to cut the optical film by the edge part 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a partition reflector used in radiation detection and a radiation detector.

  In radiation detection including a scintillator that emits light upon incidence of radiation, a partition reflector as disclosed in Patent Document 1, for example, as a conventional technique is known as a reflector that reflects light generated by the scintillator.

As shown in FIG. 21, the partition reflector 100 includes a reflector main body 101 made of an optical film having light reflectivity, and a plurality of slits 102 formed at intervals in the reflector main body 101. . Using a plurality of partition reflectors 100 having such a configuration, a plurality of accommodating portions for accommodating the scintillators are formed by engaging the slits 102 of the intersecting partition reflectors 100 with each other. The slit is formed by laser processing an optical film.
JP 2003-248059 A

  However, in such a partition reflecting plate 100, when the slits 102 of the intersecting partition reflecting plates 100 are engaged with each other, the slit 102 of one partition reflecting plate 100 and the reflecting plate body 101 of the other partition reflecting plate There was a gap between them. As a result, the light generated by the scintillator may leak from this gap, and there is a problem that the detection accuracy of the radiation detector is lowered.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a partition reflector manufacturing method and a radiation detector that can improve detection accuracy in radiation detection.

  The object of the present invention is a method of manufacturing a partition reflector having a reflector main body made of an optical film having elasticity and light reflectivity, and a plurality of slits formed at intervals in the reflector main body. The partition reflecting plate can form a plurality of accommodating portions in which a scintillator is accommodated by combining a plurality of the partition reflectors so that the slits are engaged with each other, and cutting the optical film with a cutting blade to form the slits The cutting blade includes a sharp cutting edge portion and a cutting edge portion extending from the cutting edge portion along a side surface, and the cutting step inserts the cutting edge portion into a punching position of the optical film. Inserting a step of forming a perforation in the optical film, and a moving step of moving the cutting blade so as to cut the optical film by the blade edge portion. It is achieved by the method of obtaining the partition reflector.

  Further, the object of the present invention is to provide a partition reflector including a reflector main body made of an optical film having elasticity and light reflectivity, and a plurality of slits formed at intervals in the reflector main body, and a plurality of reflector reflectors. A plurality of accommodating portions formed by engaging the slits of the partition reflector, a plurality of scintillators that are accommodated in the plurality of accommodating portions and emit light upon incidence of radiation, and light generated by the scintillator is detected. A radiation detector comprising an optical sensor, wherein the slit is a piercing position of the optical film using a cutting blade having a sharp cutting edge and a cutting edge extending from the cutting edge along a side surface. The optical film is perforated by piercing the cutting edge portion, and the cutting blade is moved so as to cut the optical film by the blade edge portion. Cage, the scintillator is achieved by a radiation detector comprising a coating adhesive layer having light permeability provided on the outer surface, and a cover plate having light reflectivity which is adhered to the coating adhesive layer.

  According to the method for manufacturing a partition reflector and the radiation detector of the present invention, detection accuracy in radiation detection can be increased.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, a radiation detector according to an embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram of the radiation detector 20, and FIG. 2 is a cross-sectional view taken along a line AA in FIG. 1 and a cross-sectional view taken along a line BB in FIG.

  As illustrated in FIGS. 1 and 2, the radiation detector 20 includes a detection block 21 and an optical sensor 22 bonded to the detection block 21 via a bonding gel 24.

  The detection block 21 includes a plurality of scintillators 5 arranged in an array, and an incident surface side reflecting plate 8, a peripheral reflecting plate 7, and a partition reflecting plate 1 arranged around the scintillator 5.

  Each scintillator 5 is a known light-emitting element that emits light upon the incidence of radiation such as X-rays or gamma rays, and includes an incident surface 30 on which radiation is incident and a light emitting surface 31 on which light generated inside is emitted. Yes.

  The incident surface side reflecting plate 8 covers the incident surface 30 of each scintillator 5, and the peripheral reflecting plate 7 covers the side surface of the scintillator 5 arranged at the outer edge of the detection block 21. Further, the partition reflector 1 is interposed between the scintillators 5.

  The peripheral reflecting plate 7, the incident surface side reflecting plate 8, and the partition reflecting plate 1 are films that reflect the light generated by each scintillator 5, and are formed of an optical film having elasticity and light reflectivity.

  The optical film is not particularly limited as long as it has elasticity and light reflectivity, but is preferably a film having a high reflectance in the visible light range due to a multilayer film structure using a polyester-based resin. From the viewpoint of low loss, a <Vicuity> (registered trademark) ESR (Enhanced Specular Reflector) reflective film (manufactured by Sumitomo 3M Limited) is particularly preferable.

  FIG. 3 is a schematic configuration diagram of the partition reflector 1. As shown in FIG. 3, the partition reflection plate 1 includes a reflection plate body 6 formed by cutting an optical film into a rectangular shape. The reflector main body 6 includes long sides 6a and 6b facing each other, and a plurality of slits 3 formed so as to extend from the long side 6a on one end side toward the long side 6b on the other end side. The plurality of slits 3 are formed at intervals according to the arrangement interval of the scintillators 5. Each slit 3 is formed so as to extend in parallel, and the slit depth is formed to be half of the short side length of the reflector main body 6.

  The plurality of partition reflectors 1 are arranged in a lattice pattern, and the partition reflectors 1 that intersect each other are assembled by engaging the slits 3. The plurality of partition reflectors 1 are assembled in a lattice shape to form an accommodating portion 25 that accommodates the scintillator 5. The slit body 3 of the partitioning reflector 1 that intersects is inserted into the slit 3 of each partitioning reflector 1.

  The optical sensor 22 detects light generated by the scintillator 5 and converts it into an electrical signal. For example, a photomultiplier tube or a semiconductor photodetector can be used. The optical sensor 22 is connected to an electrical circuit 23 that converts an electrical signal sent from the optical sensor 22 into a digital signal.

  Next, the cutting device 50 for implementing the manufacturing method of the partition reflecting plate 1 which concerns on one Embodiment of this invention is demonstrated. FIG. 4 is a schematic configuration diagram of the cutting device 50, and FIG. 5 is an enlarged view of a main part of the cutting device 50. As shown in FIG. 4, the cutting device 50 includes a horizontal mounting table 51 on which the optical film 2 described above is mounted, and an X moving body 52 and a Y moving body 53 that move horizontally along the upper surface of the mounting table 51. And.

  The mounting table 51 includes a cutter mat 56 attached to the upper surface, and a vacuum pump 59 for sucking air on the front surface side of the cutter mat 56 to the rear surface side. The cutter mat 56 is made of a material having elasticity and high restoring force, and includes a plurality of ventilation holes 58 for allowing air to pass from the front surface side to the back surface side. The vacuum pump 59 brings the optical film 2 into close contact with the cutter mat 56 by sucking air on the front surface side of the cutter mat 56 to the back surface side through the vent hole 58.

  The X moving body 52 and the Y moving body 53 can reciprocate in two directions orthogonal to each other (the X direction indicated by an arrow in FIG. 4 and the Y direction) by driving a motor. The Y moving body 53 includes a Z moving body 54 that can reciprocate in a direction orthogonal to the upper surface of the mounting table 51 (in the direction of arrow Z in FIG. 4) by driving an actuator. The Z moving body 54 includes a rotating head 55 that is rotatable with respect to the Z moving body 54 at the tip.

  FIG. 6 is an enlarged view of a main part of the rotary head 55. As shown in FIG. 6, the rotary head 55 includes a cutting blade 10 that cuts the optical film 2 and a pressing roller 57 that presses the optical film 2 when being cut by the cutting blade 10. The cutting blade 10 is held at the tip of the rotary head 55, and the pressing roller 57 is provided on both sides of the cutting blade 10.

  As the cutting blade 10, a known cutter knife blade can be used. The cutting blade 10 includes a cutting edge part 11, a cutting edge part 12, and a cutting edge part 13. The cutting edge portion 11 is a blade portion of the cutting blade 10, the blade edge portion 12 is a tip portion of the cutting blade portion 11, and the cutting edge portion 13 is a sharp portion located at the tip of the cutting blade 10. . The blade edge portion 12 extends obliquely upward from the cut edge portion 13 along the side surface of the cutting blade 10. 7A and 6B are a cross-sectional view taken along a line AA and a cross-sectional view taken along a line BB in FIG. As shown in FIG. 7, the cutting edge portion 11 has a triangular pyramid shape that gradually tapers toward the cutting edge portion 13. Further, the cutting blade 10 is configured to be able to change the direction in which the cutting edge portion 12 faces (the cutting edge direction) by the rotation of the rotary head 55. The pressing roller 57 is in contact with the optical film 2 and is movable while rotating in a state in which the optical film 2 is prevented from fine movement.

  The operations of the X moving body 52, the Y moving body 53, the Z moving body 54, and the rotary head 55 are controlled by control means (not shown), and the cutting blade 10 is moved to a preset position by the control of the control means. Can do.

  Next, a method for manufacturing the partition reflector 1 using the cutting device 50 configured as described above will be described.

  First, in a state where the optical film 2 is placed on the upper surface of the cutter mat 56, the vacuum pump 59 is operated, so that the optical film 2 is adhered and fixed to the cutter mat 56 by the suction force of the vacuum pump 59. In order to firmly fix the optical film 2 to the cutter mat 56, an adhesive tape may be attached to the peripheral portion of the optical film 2.

  Next, the slit 3 is formed by cutting the optical film 2 with the cutting blade 10. 8 and 9 are enlarged views of the main part when the optical film 2 is cut.

  In order to form the slit 3, first, the cutting edge portion 13 of the cutting blade 10 is inserted into the perforation position 19 of the optical film 2 in a state where the cutting edge direction of the cutting blade 10 is matched with the direction in which the slit 3 is formed. To do. The piercing position 19 is the deepest part of the slit 3. Moreover, the width of the slit 3 can be adjusted by adjusting the insertion depth of the cutting blade 10. The width of the slit 3 is preferably narrower than the thickness of the optical film 2. When the cut portion 13 is inserted into the optical film 2, the shape of the cut portion 13 is formed at the perforation position 19 by the shearing force acting in the vertical direction (Z direction) on the optical film 2 by the cut portion 13. Perforations are formed.

  Next, in a state where the cutting blade 10 is inserted into the optical film 2, the cutting blade 10 is moved so that the optical film 2 is cut at the blade edge portion 12 as indicated by an arrow in FIG. 8. Since the cutting blade 10 has a triangular pyramid shape that tapers toward the cutting edge portion 13, the cut portion 18 of the optical film 2 is cut by the cutting blade 10 as shown in FIG. 9. The pressing blade 11 is pressed downward. Thereby, the optical film 2 in the vicinity of the part to be cut 18 bends downward, and the curved curved part 16 and the contact part 17 composed of the surface of the curved part 16 are formed. The curved portion 16 is elastically deformable because the optical film 2 has elasticity.

  Then, the optical film 2 is cut | disconnected by moving the blade edge | tip part 12 to the position used as the opening part of the slit 3, and the slit 3 is formed.

  Finally, as shown by a dotted line in FIG. 5, the optical film 2 is cut by the cutting blade 10 along the peripheral edge portion of the reflector main body 6. Thus, the partition reflector 1 is manufactured.

  In the partition reflector 1 manufactured by the method as described above, as shown in FIG. 10, the reflector main body 6 includes a curved curved portion 16 and a contact portion 17 formed on the surface of the curved portion 16. And. Since the curved portion 16 can be elastically deformed, the contact portion 17 elastically contacts the reflector main body 6 in a state where the reflector main body 6 is inserted into the slit 3. Thereby, in a state where the partition reflectors 1 that intersect each other are assembled by engaging the slits 3, the contact portion 17 of the other reflector body 6 is in close contact with the one reflector body 6, and the reflector body The gap between 6 and the slit 3 is sealed.

  According to the manufacturing method of the partition reflector 1 according to this embodiment, the cutting blade 10 includes a cutting step for forming the slit 3 by cutting the optical film 2 with the cutting blade 10. A cutting edge portion 12 extending along the side surface from the cutting edge portion 13, and the cutting step inserts the cutting edge portion 13 into the punching position 19 of the optical film 2 to form a hole in the optical film 2. A step and a moving step of moving the cutting blade 10 so as to cut the optical film 2 by the blade edge portion 12. In the process of forming the slit 3, the curved portion 16 that can be elastically deformed, and the curved portion 16. It is possible to form the abutting portion 17 made of the surface. When a plurality of partition reflectors 1 manufactured by this method are used and the slits 3 are engaged with each other and assembled into a lattice shape, the gap between the reflector main body 6 and the slits 3 is hermetically sealed. It is possible to prevent light from leaking from the slit 3. As a result, the detection accuracy in radiation detection can be increased.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment. Hereinafter, the same components as those described above are denoted by the same reference numerals and description thereof is omitted.

  For example, in the present embodiment, the width of the slit 3 is narrower than the thickness of the partition reflector 1, but may be wider than the thickness of the partition reflector 1. In this case, from the viewpoint of preventing light leakage from the slit 3, as shown in FIG. 11, by pressing the curved portion 16 of the partition reflector 1 with the scintillator 5, the contact portion 17 is brought into contact with the reflector main body 6. It is preferable to make it contact.

Moreover, the cutting device 50 will not be specifically limited if it can move the position of the cutting blade 10 to the position set beforehand by control of a control means, For example, industrial cutting machine: CFS-1313 (registration) Trademark) (Mimaki Engineering Co., Ltd.)
In this embodiment, the peripheral edge of the reflector main body 6 is cut after the slit 3 is formed. However, the cutting order is not particularly limited, and the slit 3 is formed after the peripheral edge of the reflector main body 6 is cut. May be.

  Further, the scintillator 5 may include a covering plate 61 that covers the outer surface. In this case, as shown in FIG. 12, the scintillator 5 includes a light-transmitting covering adhesive layer 62 provided on the outer surface, and a light-reflecting covering plate 61 bonded to the covering adhesive layer 62. I have. The covering plate 61 covers a surface other than the light emitting surface 31 of the scintillator 5. The covering plate 61 is not particularly limited as long as it has light reflectivity, but is preferably formed from the optical film 2 described above. The covering adhesive layer 62 is not particularly limited as long as it has optical transparency and adhesiveness, but is preferably a double-sided adhesive film from the viewpoint of uniform thickness, and from the viewpoint of increasing optical transparency, Transparent adhesive transfer tape: product number 8141 and product number 8142 (manufactured by Sumitomo 3M Limited) are particularly preferred. Further, when an adhesive is used as the covering adhesive layer 62, it is preferable to apply it to the scintillator 5 with a uniform thickness.

  According to such a configuration, since the scintillator 5 is covered with the covering plate 61 in advance, it is possible to more reliably prevent light from leaking from the slit 3. Moreover, since the scintillator 5 and the covering plate 61 are configured in advance as a unit, the handling property can be improved. Moreover, according to such a scintillator 5, it can assemble in a free shape, for example, as shown in FIG.

  Moreover, in this embodiment, although the scintillator 5 and the entrance plane side reflecting plate 8 were not joined, the structure which joins both may be sufficient. FIG. 14 is a vertical cross-sectional view of the detection block 21 in a state where the scintillator 5 and the incident surface side reflection plate 8 are joined, and FIG. In this case, as shown in FIGS. 14 and 15, an incident surface side adhesive layer 65 that joins both is interposed between the scintillator 5 and the incident surface side reflection plate 8. The incident surface side adhesive layer 65 is not particularly limited as long as it has optical transparency and adhesiveness, but is the above-described highly transparent adhesive transfer tape: product number 8141 or product number 8142 (manufactured by Sumitomo 3M Limited). It is preferable.

  According to such a configuration, since the scintillator 5 and the incident surface side reflection plate 8 are brought into close contact with each other by the incident surface side adhesive layer 65, the movement of the scintillator 5 can be regulated. Thereby, the detection accuracy of the radiation detector 20 can be improved.

  In the present embodiment, the detection block 21 is bonded to the bonding gel 24 when the detection block 21 and the optical sensor 22 are connected. However, the detection block 21 is interposed between the detection block 21 and the bonding gel 24. A gel 66 may be interposed. FIG. 16 is a longitudinal sectional view of the detection block 21 in a state in which the interposition gel 66 is interposed between the detection block 21 and the bonding gel 24, and FIG. 17 is an enlarged view of a main part of the detection block 21. . As shown in FIGS. 16 and 17, the interposed gel 66 seals the gap between the scintillator 5 and the partition reflector 1 by being disposed between the detection block 21 and the bonding gel 24. The interstitial gel 66 is preferably a gel having adhesiveness, light transmission, and waterproofness, and is particularly preferably BC-600 (registered trademark) (manufactured by Saint-Gobain Co., Ltd.) from the viewpoint of excellent light transmission. preferable. Since the interposed gel 66 is waterproof, it has a great effect of protecting the deliquescent scintillator 5 from environmental moisture.

  Next, an interposing method for interposing the interposing gel 66 between the detection block 21 and the bonding gel 24 will be described. FIG. 18 is a diagram for explaining an interposing method of the interposing gel 66. First, the detection block 21 is placed on the intervention gel 66 in a state where the intervention gel 66 is placed on the protection plate 68 placed on a horizontal plane. The detection block 21 is placed with the light emission surface of the scintillator 5 facing downward. Further, it is preferable that the detection block 21 is placed when the viscosity of the intervening gel 66 has increased to some extent. Specifically, it is preferable to place the detection block 21 when the viscosity of the intervening gel 66 reaches 10000 cP. The protective plate 68 is preferably a polyester multilayer plate, and particularly preferably the optical film 2 described above.

  Next, the intervention gel 66 is solidified by being left in the state where the detection block 21 is placed on the intervention gel 66. In the process of solidifying the intervention gel 66, the intervention gel 66 may be pressed downward by pressing the detection block 21 downward. At this time, the thickness of the interposed gel 66 can be adjusted by adjusting the pressing force. Thereafter, after the protective plate 68 is peeled from the interposed gel 66, the bonding gel 24 is applied to the interposed gel 66.

  According to such a configuration, since the gap between the scintillator 5 and the partition reflector 1 is sealed by the interposed gel 66, it is possible to prevent the bonding gel 24 from penetrating into the gap. Further, a part of the interposed gel 66 can enter the gap between the scintillator 5 and the partition reflector 1 to fill the gap. Thereby, it can prevent that the light quantity of the light which generate | occur | produced in the scintillator 5 falls, and the precision of the radiation detector 20 can be improved. Moreover, it can prevent that the joining gel 24 osmose | permeates the partition reflecting plate 1, and can prevent that the light reflectivity of the partition reflecting plate 1 falls. Further, by pressurizing the interstitial gel 66 in the process of solidifying, the thickness of the interstitial gel 66 can be reduced. Thereby, it can prevent that the optical sensor 22 detects the light which generate | occur | produced in the adjacent scintillator 5 accidentally. Further, it is possible to prevent moisture from entering the detection block 21. In particular, it is effective as a means for protecting the deliquescent scintillator 5 from environmental moisture. Moreover, what applied the interposition gel 66 to the outer surface of each scintillator 5 can also be accommodated in the detection block 21. Thereby, each scintillator 5 can be protected from environmental moisture.

  Moreover, in this embodiment, although the several scintillator 5 in the detection block 21 was made into the equal magnitude | size all, you may change the magnitude | size according to the arrangement position of the scintillator 5. FIG. FIG. 19 is a cross-sectional view of the detection block 21. As shown in FIG. 19, the scintillator 5 disposed at the periphery of the detection block 21 may be larger than the scintillator 5 disposed inside. According to such a configuration, the light detected at the peripheral edge of the detection block 21 can be accurately waveform-separated. As a result, the effective area where light can be detected can be improved, and the detection accuracy of the radiation detector 20 can be improved.

  Another configuration of the detection block will be described. The detection block includes a lattice-shaped ceramic container and a plurality of scintillators accommodated in the ceramic container. The ceramic is not particularly limited as long as it has excellent reflectivity.

  FIG. 20 is a (a) longitudinal sectional view and (b) transverse sectional view of the extrusion die 80. The ceramic container can be manufactured using an extrusion die 80 including a female die 82 and a male die 81 as shown in FIG. The female mold 82 includes a quadrangular cylindrical frame and a quadrangular column disposed in the frame. The male mold 81 includes a base and a protrusion that extends downward from the base.

  In the case of manufacturing a ceramic container, with the male mold 81 inserted into the female mold 82, the ceramic mixed composition is press-fitted into the female mold 82 as shown by an arrow P in FIG.

  Another method for forming the slit 3 will be described. When the optical film 2 is cut and the slit 3 is formed, the optical film 2 may be cut using a Thomson mold. The Thomson type includes a plurality of blades arranged at predetermined positions, and is a type for punching soft plastic or rubber films. The partition reflector 1 can be mass-produced by using the Thomson type.

It is a schematic block diagram of the radiation detector which concerns on one Embodiment of this invention. It is (a) AA sectional drawing in FIG. 1, (b) It is BB sectional drawing. It is a schematic block diagram of a partition reflecting plate. It is a schematic block diagram of a cutting device. It is a principal part enlarged view of a cutting device. It is a principal part enlarged view of a rotary head. It is (a) AA sectional drawing of FIG. 6, and (b) BB sectional drawing. It is a principal part enlarged view of an optical film. It is a principal part enlarged view of an optical film. It is a principal part enlarged view of a detection block. It is a principal part enlarged view of a detection block. It is a longitudinal cross-sectional view of a scintillator. It is a cross-sectional view of a state where the scintillator is assembled. It is a longitudinal cross-sectional view of a detection block. It is a principal part enlarged view of a detection block. It is a longitudinal cross-sectional view of a detection block. It is a principal part enlarged view of a detection block. It is a figure explaining the intervention method of an intervention gel. It is a cross-sectional view of a detection block. It is (a) longitudinal cross-sectional view and (b) cross-sectional view of an extrusion type | mold. It is a schematic block diagram of the conventional partition reflector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Partitioning reflector 2 Optical film 3 Slit 5 Scintillator 6 Reflector main body 10 Cutting blade 11 Cutting blade part 12 Blade edge part 13 Cutting edge part 16 Bending part 17 Contact part 20 Radiation detector 21 Detection block 22 Optical sensor

Claims (2)

A method of manufacturing a partition reflector including a reflector main body made of an optical film having elasticity and light reflectivity, and a plurality of slits formed at intervals in the reflector main body,
The partition reflector can form a plurality of accommodating portions in which a scintillator is accommodated by combining a plurality of the slits so that the slits mesh with each other.
A cutting step of forming the slit by cutting the optical film with a cutting blade;
The cutting blade includes a sharp cutting edge portion and a cutting edge portion extending along a side surface from the cutting edge portion,
The cutting step includes a step of forming a perforation in the optical film by inserting the cut portion into a perforation position of the optical film, and the cutting blade so as to cut the optical film by the blade tip portion. The manufacturing method of a partition reflecting plate provided with the movement step which moves. A plurality of partition reflectors comprising a reflector main body made of an optical film having elasticity and light reflectivity, and a plurality of slits formed at intervals in the reflector main body,
A plurality of accommodating portions formed by engaging the slits of the plurality of partition reflectors;
A plurality of scintillators that are housed in the plurality of housing portions and emit light upon incidence of radiation;
A radiation detector comprising an optical sensor for detecting light generated by the scintillator,
The slit is formed by inserting the cutting edge into the perforation position of the optical film using a cutting blade having a sharp cutting edge and a cutting edge extending from the cutting edge along the side surface. It is formed by forming perforations in the optical film and moving the cutting blade so as to cut the optical film by the blade edge part,
The scintillator is a radiation detector including a light-transmitting covering adhesive layer provided on an outer surface and a light-reflecting covering plate bonded to the covering adhesive layer.

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