JP6826398B2 - Cassette and thermofluorescent sheet reader - Google Patents

Description

The present invention relates to a cassette that holds the thermofluorescent sheet when measuring the fluorescence emitted from the thermofluorescent sheet irradiated with radiation, and a thermofluorescent sheet reading device including the cassette.

Various radiation dosimeters have been proposed for detecting the radiation exposure location and the amount of radiation exposure. As a radiation dosimeter, for example, a thermoluminescent sheet for measuring the absorbed dose to the skin, a thermoluminescent plate for measuring the absorbed dose to the human body, or a thermoluminescent material sealed in a glass tube, etc. Dosimeter) is used. Since the above-mentioned thermal phosphor irradiated with radiation emits fluorescence by heating, a measuring device having a heating unit for heating the thermal phosphor and an imaging unit for measuring the emitted fluorescence has been proposed. There is. (See, for example, Patent Document 1).

In Patent Document 1, the thermal fluorescence image reading device includes a sample sheet that serves as an image provider made of a mixture of a thermal phosphor and glass, a heating unit that heats the above-mentioned sample sheet, and a sample sheet installation unit. And an imaging unit. Further, the image reading device includes a heat insulating portion between the sample sheet installation portion and the imaging unit that blocks heat so that the heat of the heating unit is not transferred to the imaging unit.

As a result, the heat generated in the heating unit is suppressed from being transferred to the imaging unit.

Japanese Unexamined Patent Publication No. 2014-28913

By the way, when the above-mentioned sample sheet is heated, if the heat is not uniformly transferred to the sample sheet, the sample sheet may be deformed due to the influence of the heat. When the sample sheet is deformed, there is a problem that a two-dimensional image of fluorescence emitted by the sample sheet cannot be accurately obtained.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a cassette capable of suppressing deformation of the thermofluorescent sheet and a thermofluorescent sheet reading device including the cassette.

In order to achieve the above object, the cassette according to the present invention is a cassette that holds the thermofluorescent sheet when measuring the fluorescence emitted from the thermofluorescent sheet irradiated with radiation, and transmits the fluorescence. A flat plate-shaped glass on which the thermofluorescent sheet is placed on the upper surface, a spacer placed around the thermofluorescent sheet on the upper surface of the glass, and a flat plate that presses the thermofluorescent sheet in surface contact with the lower surface. The spacer is provided with a heat-fluorescent sheet pressing plate, and the upper surface of the spacer is flush with the upper surface of the heat-fluorescent sheet.

As a result, the thermofluorescent sheet pressing plate can easily apply a uniform force to the entire thermofluorescent sheet. Further, when the heat fluorescent sheet pressing plate conducts heat to the heat fluorescent sheet, heat is likely to be uniformly applied to the entire heat fluorescent sheet. Therefore, the deformation of the thermofluorescent sheet is suppressed.

Further, the thickness of the spacer and the thickness of the thermofluorescent sheet may be substantially the same.

As a result, the thermofluorescent sheet pressing plate can easily apply a uniform force to the entire thermofluorescent sheet.

Further, the cassette further includes a flat plate-shaped protective sheet that transmits the fluorescence and is placed on the upper surface of the glass, and the thermal fluorescent sheet is placed on the upper surface of the protective sheet and the thickness of the spacer. And the total thickness of the thickness of the thermofluorescent sheet and the thickness of the protective sheet may be substantially the same.

As a result, the thermofluorescent sheet pressing plate can easily apply a uniform force to the entire thermofluorescent sheet.

Further, the cassette further includes a frame body that supports the glass and the heat fluorescent sheet pressing plate, and when the heat fluorescent sheet pressing plate presses the heat fluorescent sheet, it is attached to the upper surface of the frame body. The upper surface of the thermofluorescent sheet pressing plate may be flush with the upper surface.

As a result, when a heater or the like is pressed against the upper part of the cassette, the force is likely to be uniformly applied to the upper surface of the cassette. That is, a uniform force is likely to be applied to the entire thermofluorescent sheet. Therefore, the deformation of the thermofluorescent sheet is suppressed.

Further, the heat fluorescent sheet pressing plate has a flat plate-shaped heat conductive portion that comes into surface contact with the heat fluorescent sheet and a frame portion formed at an end portion of the heat conductive portion, and the heat conductive portion is made of glass. It may contain fiber and polytetrafluoroethylene.

As a result, the heat-fluorescent sheet pressing plate can easily efficiently conduct heat generated from a heating portion such as a heater to the heat-fluorescent sheet.

Further, the frame portion and the frame body may include a magnetic material on one side and a magnet on the other side, and the frame portion and the frame body may be in positions opposed to each other via the spacer.

By doing so, when the thermofluorescent sheet is held in the cassette, the positions of the frame body and the frame portion are fixed by magnetic force. Therefore, it is not necessary to provide a locking portion for holding the thermofluorescent sheet. Therefore, the cassette can hold the thermofluorescent sheet in the cassette with a simple structure.

Further, the cassette is substantially square in a plan view, and the frame body has a plurality of grooves on the upper surface, and when viewed in a plan view, the plurality of grooves when the center of the cassette is rotated by 90 degrees. It may be formed at a position that substantially coincides with.

That is, the positions of the grooves used for transporting the cassette in the thermofluorescent sheet reader are substantially the same in the first orientation and the second orientation orthogonal to the first orientation. Therefore, when the operator carries the cassette into the thermofluorescent sheet reading device, the load on the operator can be reduced because the cassette is not restricted by the orientation of the cassette.

Further, a recess may be formed on the lower surface of the frame body. Specifically, the cassette includes recesses that are used to determine where the cassette is installed during movement within the thermofluorescent sheet reader.

As a result, the installation position of the cassette in the thermofluorescent sheet reader can be determined with a simple configuration.

Further, the frame body and the spacer may be detachably fixed to each other.

Thereby, the spacer can be easily changed according to the thickness of the thermofluorescent sheet. That is, it is possible to provide a cassette according to the thickness of the thermofluorescent sheet only by changing the spacer.

Further, the thermofluorescent sheet reading device according to the present invention is a thermofluorescent sheet reading device for measuring fluorescence emitted from a thermofluorescent sheet irradiated with radiation, and includes the cassette.

This makes it possible to provide a thermofluorescent sheet reading device including a cassette in which deformation of the thermofluorescent sheet is suppressed.

In the cassette or the like according to one aspect of the present invention, deformation of the thermofluorescent sheet can be suppressed.

FIG. 1 is a perspective view showing the appearance of the front side of the thermofluorescent sheet reading device according to the embodiment. FIG. 2 is a perspective view showing the appearance of the back side of the thermofluorescent sheet reading device according to the embodiment. FIG. 3 is a perspective view showing an internal structure on the front side of the thermofluorescent sheet reading device according to the embodiment. FIG. 4 is a perspective view showing an internal structure on the back side of the thermofluorescent sheet reading device according to the embodiment. FIG. 5 is a partially enlarged view showing an enlarged portion of the portion surrounded by the broken line V in FIG. FIG. 6 is a diagram showing an example of a door portion and a key portion viewed from the inside of the housing. FIG. 7A is a perspective view showing an example of the appearance of the cassette according to the embodiment. FIG. 7B is a perspective view in which the position of the thermofluorescent sheet pressing plate of the cassette shown in FIG. 7A is changed. FIG. 7C is a top view of the cassette shown in FIG. 7A. FIG. 7D is a bottom view of the cassette shown in FIG. 7A. FIG. 7E is a cross-sectional view taken along the line VIIE-VIIE of FIG. 7A. FIG. 7F is a cross-sectional view showing a modified example of the cassette cut along the position corresponding to the line VII-VIIE of FIG. 7A. FIG. 8 is a partially enlarged view showing an enlarged portion of the portion surrounded by the broken line VIII of FIG. FIG. 9 is a block diagram showing a functional configuration and an air flow path of the thermofluorescent sheet reading device according to the embodiment. FIG. 10 is a flowchart showing a procedure of fluorescence measurement by the thermal fluorescence sheet reading device according to the embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that all of the embodiments described below show a specific example of the present invention. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, the order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components. It should be noted that each figure is a schematic view and is not necessarily exactly shown. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description may be omitted or simplified.

Further, in the present specification, it is assumed that the Z axis in each figure is the direction in which the thermofluorescent sheet is installed in the cassette. Further, it is assumed that the X-axis and the Y-axis in each figure are directions orthogonal to the Z-axis. Further, it is assumed that the X-axis is a direction orthogonal to the Y-axis. Further, in the present specification, the positive direction of the Z axis is defined as upward, and the negative direction of the Z axis is defined as downward.

Further, in the present specification, the term "parallel" includes substantially parallel, that is, a manufacturing error. Further, in the present specification, orthogonality includes substantially orthogonality, that is, manufacturing error. Further, in the present specification, "abbreviation" or "about" means to include an error that occurs during manufacturing or arrangement.

(Embodiment)
FIG. 1 is a perspective view showing the appearance of the front side of the thermofluorescent sheet reading device 1 according to the embodiment. FIG. 2 is a perspective view showing the appearance of the back side of the thermofluorescent sheet reading device 1 according to the embodiment. FIG. 3 is a perspective view showing an internal structure on the front side of the thermofluorescent sheet reading device 1 according to the embodiment. FIG. 4 is a perspective view showing an internal structure on the back surface side of the thermofluorescent sheet reading device 1 according to the embodiment.

The thermofluorescent sheet reading device 1 is an example of a thermofluorescent sheet reading device to which the cassette according to the embodiment is applied, and heats a thermal phosphor irradiated with radiation or the like, and fluorescence (heat) emitted from the thermal phosphor. It is a device that measures fluorescence). For example, the operator installs the above-mentioned thermofluorescent sheet on a plane on which the radiation distribution is to be confirmed. After irradiating the thermofluorescent sheet with radiation, the operator measures the fluorescence with the thermofluorescent sheet reading device 1. Then, since the operator can confirm the distribution of fluorescence and the intensity at each position, it is possible to also confirm the distribution irradiated with radiation. Further, if the correspondence between the radiation amount irradiated by the thermal phosphor and the light amount of fluorescence emitted from the thermal phosphor is known, the radiation amount irradiated can be indirectly confirmed from the light amount of fluorescence.

When a thermal phosphor is irradiated with radiation, some electrons are excited by the energy of the radiation and the state is maintained. Then, in the thermal phosphor, when thermal energy is applied from the outside in a state where the electrons are excited (specifically, when heated), the electrons return to the ground state and fluorescence is emitted. The thermofluorescent sheet is one in which the above-mentioned thermofluorescent material is uniformly formed on a sheet-like flat surface.

As shown in FIG. 1, the thermofluorescent sheet reading device 1 includes a housing 2 and an operation unit 5.

The housing 2 is a box body that covers a heating unit 19 (see FIG. 3) that heats the thermofluorescent sheet, an imaging unit 15 (see FIG. 3) that captures the fluorescence emitted from the thermofluorescent sheet, and the like. The material of the housing 2 is, for example, metal. The housing 2 has a door portion 3 for carrying in the cassette 31 in which the thermofluorescent sheet is installed in the housing 2, and a door portion 3a for taking out the cassette 31 from the housing 2 after the fluorescence measurement is completed. Be prepared.

The housing 2 further includes an air inlet 6 for feeding air into the thermofluorescent sheet reading device 1. The air inlet 6 is provided below the side surface of the housing 2 (for example, the surface of the housing 2 on the Y direction side shown in FIG. 1). By doing so, the air outside the housing 2 having a temperature lower than that of the heating unit 19 is taken into the housing 2 from below the thermofluorescent sheet reading device 1. Since the air having a relatively high temperature moves upward, the inside of the housing 2 is efficiently exhausted.

Further, the housing 2 is further provided with an inspection window 4. The inspection window 4 is provided so as to communicate with a portion of the housing 2 where the lens 16 is installed, and is used for adjusting the diaphragm when measuring fluorescence and for maintenance.

The operation unit 5 is a mechanism for an operator to instruct the operation of the thermal fluorescence sheet reading device 1, and is a device that receives instructions such as a temperature setting and a measurement time of the heating unit 19 for measuring thermal fluorescence. .. The operation unit 5 is composed of, for example, a touch panel or the like.

Further, the thermofluorescent sheet reading device 1 includes a cassette storage unit 7 for storing a cassette 31 (see FIG. 7A) for holding an unused thermofluorescent sheet.

Further, the thermofluorescent sheet reading device 1 includes an emergency stop switch 8. The emergency stop switch 8 is a button for stopping the operation of the thermofluorescent sheet reading device 1 in an emergency. The emergency stop switch 8 is for forcibly stopping the operation of the thermal fluorescence sheet reading device 1 by pressing the emergency stop switch 8 by an operator when, for example, the heating unit 19 malfunctions.

Further, the thermofluorescent sheet reading device 1 includes a cassette carry-in lamp 9a and a cassette carry-out lamp 9b. The cassette carry-in lamp 9a and the cassette carry-out lamp 9b visually indicate to the operator whether the cassette 31 can be carried in to the thermofluorescent sheet reading device 1 or can be carried out from the thermofluorescent sheet reading device 1 by turning on or off. It is a lamp to contact.

Further, the thermal fluorescence sheet reading device 1 includes a heater energizing lamp 10. The heater energization lamp 10 is a lamp that visually informs the operator by turning on or off whether or not the heating unit 19 is energized, that is, whether or not the heating unit 19 is heating.

As shown in FIG. 2, the housing 2 further includes an air outlet 12. The air discharge port 12 is provided to discharge the air inside the thermofluorescent sheet reading device 1 to the outside, and is arranged above the air inlet 6 (on the Z-axis positive direction side in FIG. 2). Since the air having a relatively high temperature moves upward, it is possible to efficiently exhaust the inside of the housing 2. The housing 2 may be further provided with an upper ventilation port 11 in order to facilitate exhausting inside the housing 2.

Further, the thermofluorescent sheet reading device 1 further includes a power supply / connector unit 13. The power supply / connector portion 13 is composed of a power switch, a fuse, and the like. Further, the power supply / connector unit 13 is connected to a commercial AC power supply (not shown). The power supply / connector unit 13 further includes a connection terminal to which a communication cable or the like is connected when communicating with the outside via a network or the like.

As shown in FIG. 3, the thermofluorescent sheet reading device 1 further includes an imaging unit 15, a first cooling fan 14, a heating chamber 27, a heating unit 19, a cooling chamber 22, a light source 18, and a power supply. It includes a unit 23.

The imaging unit 15 is a mechanism for measuring the fluorescence emitted from the thermal fluorescence sheet. The image pickup unit 15 includes, for example, a camera provided with an image pickup element, a lens 16 that collects fluorescence emitted from a thermal fluorescence sheet, and a filter 17 that transmits only light of a specific wavelength. The image pickup device is, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The imaging unit 15 may include a shutter to control the timing of measuring fluorescence. Further, the imaging unit 15 may be provided with a heat sink, a Peltier element, or the like in order to efficiently lower the temperature of the imaging unit 15.

The first cooling fan 14 is a fan for cooling the inside of the thermofluorescent sheet reading device 1. The first cooling fan 14 sends air from the outside to the inside of the thermal fluorescence sheet reading device 1. For example, the first cooling fan 14 is arranged at a position where the air outside the thermofluorescent sheet reading device 1 can be directly blown to the imaging unit 15.

The heating chamber 27 is a room (space) for installing a cassette 31 (see FIG. 7A) provided with a thermofluorescent sheet. The thermofluorescent sheet installed in the heating chamber 27 is heated by the heating unit 19 to emit fluorescence.

The heating unit 19 is a mechanism for heating the cassette 31 installed in the heating chamber 27 from above. Specifically, when heating the thermofluorescent sheet, the heating unit 19 comes into contact with the cassette 31 on which the thermofluorescent sheet is installed to heat the cassette 31. The heating unit 19 comes into contact with the cassette 31 so that a force is uniformly applied to the entire upper surface of the cassette 31. The heating unit 19 is, for example, an electric heater.

The cooling chamber 22 is a room (space) provided for cooling the cassette 31 before carrying out the cassette 31 on which the thermofluorescent sheet for which the fluorescence measurement has been completed is installed to the outside of the thermofluorescent sheet reading device 1. is there.

The heating chamber 27 and the cooling chamber 22 are spaces in which the cassette 31 is installed inside the thermofluorescent sheet reading device 1, and the structure of the spaces is not particularly limited, and walls are provided to partition the spaces. It may be provided, or a door that can be opened and closed may be provided.

The light source 18 is an illumination light source for irradiating the thermal fluorescence sheet with light when the thermal fluorescence sheet (cassette 31 on which the thermal fluorescence sheet is installed) is installed in the heating chamber 27. The light source 18 is used, for example, when the thermofluorescent sheet is provided with a mark for confirming the position, for confirming the position. As the light source 18, for example, an LED (Light Emitting Diode) or the like is used. The light used for the light source 18 may be light having a wavelength that passes through the filter 17, and is not particularly limited.

The power supply unit 23 is a device that controls the electric power supplied from the power supply / connector unit 13. The power supply unit 23 is a device that supplies electric power to each component of the thermal fluorescence sheet reading device 1, for example, an electric heater that is an example of the heating unit 19.

Further, the thermal fluorescence sheet reading device 1 further includes an upper cooling fan 20.

The upper cooling fan 20 is a fan for forming an air flow path in the thermofluorescent sheet reading device 1. The upper cooling fan 20 discharges the air inside the thermofluorescent sheet reading device 1 to the outside or sends the air outside the thermofluorescent sheet reading device 1 to the inside in order to remove the heat in the vicinity of the heating unit 19. Enter. The upper cooling fan 20 is arranged, for example, on the upper part of the heating unit 19 (on the positive direction side of the Z axis in FIG. 3).

Further, the thermofluorescent sheet reading device 1 further includes a motor 28.

The motor 28 is a motor for moving the heating unit 19. When the heating unit 19 heats the motor 28, the motor 28 drives the heating unit 19 so as to approach the cassette 31 installed in the heating chamber 27. Specifically, when the heating unit 19 heats, the motor 28 is driven so that the cassette 31 installed in the heating chamber 27 is pressed by the heating unit 19. When not heating, the heating unit 19 is driven so as to be away from the cassette 31 installed in the heating chamber 27. By doing so, it becomes possible to efficiently heat and exhaust the heat of the heating chamber 27.

As shown in FIG. 4, the thermofluorescent sheet reading device 1 further includes a second cooling fan 24 and a power supply unit fan 25.

The second cooling fan 24 is located in the vicinity of the cooling chamber 22 and is a fan for discharging the air inside the thermofluorescent sheet reading device 1 to the outside. By doing so, the second cooling fan 24 can cool the thermal fluorescence sheet installed in the cooling chamber 22, and further, the first cooling fan 14 and the second cooling fan 24 described above can efficiently perform thermal fluorescence. It is possible to exhaust heat inside the sheet reading device 1.

The power supply unit fan 25 is a fan for cooling the power supply unit 23. The power supply unit fan 25 is located in the vicinity of the power supply unit 23.

FIG. 5 is a partially enlarged view showing an enlarged portion of the portion surrounded by the broken line V in FIG. As shown in FIG. 5, the thermofluorescent sheet reading device 1 includes a filter plate 17a provided with a filter 17 that allows only wavelengths in a predetermined band to pass between the heating unit 19 and the imaging unit 15, and the imaging unit 15. A holding plate 15a for supporting the above is provided.

The filter 17 is an optical filter that transmits only light having a specific wavelength. Specifically, the filter 17 functions so as to transmit the fluorescence emitted by the thermal fluorescence sheet and not to transmit other light. By doing so, it becomes difficult for light other than the fluorescence emitted by the thermofluorescent sheet to enter the image pickup device included in the image pickup unit 15. That is, since it is difficult for stray light, which becomes noise, to enter the image pickup device, the image pickup device included in the image pickup unit 15 can accurately image the fluorescence emitted by the thermal fluorescence sheet.

The filter plate 17a and the holding plate 15a are fixed to the housing 2 so as to sandwich the lens 16 included in the imaging unit 15, and the space sandwiched between the filter plate 17a and the holding plate 15a is the inspection window 4. It is provided in communication.

Further, the filter plate 17a and the holding plate 15a are provided with a through hole 21, and a bent portion 37 is provided on the side of the through hole 21 on which air is discharged.

The bent portion 37 is a mechanism for preventing air from directly flowing from one through hole to another and moving more air inside the thermofluorescent sheet reading device 1. Further, the bent portion 37 is located above the through hole 21, and is further arranged so as to cover between the through hole 21 and the imaging portion 15. By doing so, it is possible to reduce the amount of light that the light outside the thermofluorescent sheet reading device 1 enters into the device as stray light and enters the image sensor. Further, each of the through holes 21 may be arranged at a distance as much as possible. By doing so, it becomes possible to move more air inside the thermofluorescent sheet reading device 1.

In addition, in order to reduce stray light, it is preferable that the light reflectance of the wall surface inside the thermal fluorescence sheet reading device 1 is lowered. For example, a light absorbing material may be used for the wall surface inside the thermofluorescent sheet reading device 1, or the surface may be painted with the light absorbing material.

FIG. 6 is a diagram showing an example of a door portion and a key portion viewed from the inside of the housing 2. FIG. 6A is a diagram showing an example of the door portion 3 and the key portion 26 viewed from the inside of the housing 2. FIG. 6B is an enlarged perspective view showing a portion of FIG. 6A surrounded by the broken line VI.

As shown in FIG. 6, a key portion 26 including a movable portion 26a that is electrically operated in response to an instruction from a control unit 29 (see FIG. 9) inside a housing 2 in which the door portion 3 is arranged. Is provided.

The control unit 29 is a processing unit realized by a CPU (Central Processing Unit) or a control program. The control unit 29 operates the key unit 26 at the stage where the operator installs the cassette 31 in the heating chamber 27 and moves the heating unit 19 to prevent the door unit 3 from opening. The control unit 29 operates the key unit 26 again after a predetermined time set in advance has elapsed, so that the door unit 3 is opened.

Further, the control unit 29 determines to the cassette carry-in lamp 9a whether or not the key unit 26 is locked, and issues an instruction to turn on or off the cassette carry-in lamp 9a. Further, the control unit 29 determines to the heater energizing lamp 10 whether or not the heater or the like of the heating unit 19 is operating, and issues an instruction to turn on or off the heater energizing lamp 10.

The timing of operating the key unit 26 is not particularly limited. For example, the thermofluorescent sheet reading device 1 may be provided with a temperature sensor, and the key unit 26 may be operated according to the detected temperature to prevent the door unit 3 from opening. Further, the operator may be able to give an instruction from the operation unit 5 to the key unit 26. Further, the housing 2 may be provided with a key portion 26 in the vicinity of the door portion 3a in order to control the opening and closing of the door portion 3a.

Next, the cassette 31 according to the embodiment will be described with reference to FIGS. 7A to 7E.

FIG. 7A is a perspective view showing an example of the appearance of the cassette 31 according to the embodiment. FIG. 7B is a perspective view in which the position of the thermofluorescent sheet pressing plate 40 of the cassette 31 shown in FIG. 7A is changed. FIG. 7C is a top view of the cassette 31 shown in FIG. 7A. FIG. 7D is a bottom view of the cassette 31 shown in FIG. 7A. FIG. 7E is a cross-sectional view of the cassette 31 cut along the VIIE-VIIE line of FIG. 7A. Note that FIG. 7E is a cross-sectional view showing a case where the thermofluorescent sheet 60 is placed on the cassette 31.

The cassette 31 is a box for holding the thermofluorescent sheet 60 when the thermofluorescent sheet 60 is carried into the thermofluorescent sheet reading device 1. As shown in FIGS. 7A to 7E, the cassette 31 includes a heat-resistant glass (glass) 35, a spacer 43, a thermofluorescent sheet pressing plate 40, and a frame body 34.

The heat-resistant glass 35 is a translucent glass that transmits fluorescence emitted from the heat-fluorescent sheet 60. Further, when measuring the fluorescence emitted from the thermal fluorescence sheet 60, it is necessary to heat the thermal fluorescence sheet 60, and the heat-resistant glass 35 is also heated at that time. Therefore, the heat-resistant glass 35 is heated. It is preferable that the glass has a low expansion coefficient and is reinforced so as not to break due to temperature changes. The heat-resistant glass 35 is formed of, for example, silicon dioxide and boron oxide. The heat-resistant glass 35 is arranged between the thermofluorescent sheet 60 and the imaging unit 15.

The spacer 43 is a member arranged on the heat-resistant glass 35 together with the heat-fluorescent sheet 60. When the spacer 43 is arranged on the heat-resistant glass 35, the spacer 43 is arranged so as to surround the periphery of the thermofluorescent sheet 60. The thermofluorescent sheet 60 is arranged between the heat-resistant glass 35 and the thermofluorescent sheet pressing plate 40 as shown in FIG. 7E.

Further, the thickness of the spacer 43 is formed so as to substantially match the thickness of the thermofluorescent sheet 60. In other words, the upper surface of the spacer 43 is substantially flush with the upper surface of the thermofluorescent sheet 60. Here, the thickness direction is the Z-axis direction shown in FIG. 7E, and the thickness is the length in the Z-axis direction. The upper surface of the spacer 43 and the thermofluorescent sheet 60 is a surface of the spacer 43 and the thermofluorescent sheet 60 on the positive direction side of the Z axis. That is, the spacer 43 and the thermofluorescent sheet 60 are arranged on the heat-resistant glass so that the upper surface of the spacer 43 and the upper surface of the thermofluorescent sheet 60 are flush with each other. The material of the spacer 43 is not particularly limited, but is, for example, aluminum. The spacer 43 is fixed to the frame body 34 by the spacer locking portion 44. Here, the spacer locking portion 44 is composed of, for example, a member such as a screw that can be removed from the frame body 34. That is, the spacer 43 is fixed to the frame body 34 so as to be detachable from the frame body 34. By doing so, the spacer 43 can be changed to a spacer having a thickness corresponding to the thickness of the thermofluorescent sheet.

The thermofluorescent sheet pressing plate 40 is a plate for pressing the thermofluorescent sheet 60 against the heat-resistant glass 35 from above. Specifically, the thermal fluorescence sheet pressing plate 40 is a member that is located between the heating unit 19 and the thermal fluorescence sheet 60 and is directly pressed by the heating unit 19 when the cassette 31 is heated. The thermofluorescent sheet pressing plate 40 is attached to the frame body 34 so that it can be opened and closed. Specifically, FIG. 7A shows a state in which the thermofluorescent sheet pressing plate 40 is closed, and FIG. 7B shows a state in which the thermofluorescent sheet pressing plate 40 is opened. The heat-fluorescent sheet pressing plate 40 makes it possible to suppress the heat-fluorescent sheet 60 from warping due to heating and to prevent it from coming into contact with the heating unit 19 and welding. The thermal fluorescence sheet pressing plate 40 is composed of a heat conductive portion 41 and a frame portion 42.

The heat conduction portion 41 is a plate body for conducting the heat of the heating portion 19 to the heat fluorescence sheet 60. The heat conductive portion 41 is not particularly limited as long as it has high thermal conductivity and is not deformed by the heat of the heating portion 19. From the viewpoint of thermal conductivity, the thermal conductive portion 41 is preferably composed of glass fiber and polytetrafluoroethylene (so-called Teflon (registered trademark)).

The frame portion 42 is a frame formed around the heat conductive portion 41 in order to suppress deformation of the heat conductive portion 41. The frame portion 42 is formed of, for example, a magnetic material such as iron.

The frame body 34 is a frame that supports the heat-resistant glass 35 and the like. That is, the cassette 31 is integrally formed by supporting the heat-resistant glass 35, the spacer 43, and the thermofluorescent sheet pressing plate 40 with the frame body 34. The material of the frame 34 is not particularly limited, but is formed of, for example, resin or metal.

Further, as shown in FIG. 7E, a part of the frame body 34 is formed by a magnet 34a. Further, the frame portion 42 and the frame body 34 are arranged at opposing positions via the spacer 43. Specifically, the magnet 34a is formed below the frame portion 42 of the thermofluorescent sheet pressing plate 40. That is, the magnet 34a and the frame portion 42 are attracted by a magnetic force with the spacer 43 sandwiched between them. By doing so, the heat fluorescent sheet 60 and the spacer 43 located between the heat resistant glass 35 and the heat fluorescent sheet pressing plate 40 are strongly sandwiched between the heat resistant glass 35 and the heat fluorescent sheet pressing plate 40 by the above-mentioned magnetic force. become. Therefore, the thermofluorescent sheet 60 can be fixed to the cassette 31 with a simple configuration. The frame portion 42 and the frame body 34 are not limited as long as one contains a magnetic material and the other contains a magnet 34a.

Further, as described above, the upper surface of the spacer 43 and the upper surface of the thermofluorescent sheet 60 are arranged on the heat-resistant glass 35 so as to be flush with each other. That is, the lower surface of the heat fluorescent sheet pressing plate 40 (specifically, the lower surface of the heat conductive portion 41) comes into contact with the heat fluorescent sheet 60 by applying a uniform force to the entire surface of the heat fluorescent sheet 60. Further, the upper surface 50 of the frame body 34 and the upper surface 50a of the thermofluorescent sheet pressing plate 40 are formed so as to be flush with each other. As a result, when the heat of the heating unit 19 is transferred to the thermal fluorescence sheet 60 via the thermal conduction portion 41, the heat can be easily conducted uniformly to the entire thermal fluorescence sheet 60. Therefore, the thermofluorescent sheet 60 is less likely to be deformed such as warped.

Further, as shown in FIG. 7C, the frame body 34 is provided with a plurality of groove portions 32 on the upper surface 50.

The groove portion 32 is a portion that is locked to the cassette locking portion 36a provided by the transport portion 36 when the cassette 31 is transported from the heating chamber 27 to the cooling chamber 22, and is formed at a plurality of locations. Further, when the cassette 31 is viewed in a plan view, each of the plurality of groove portions 32 is formed at positions that substantially coincide with each other when the center of the cassette 31 is rotated by 90 degrees. In other words, the plurality of groove portions 32 are positioned when the cassette 31 is carried into the heating chamber 27 in the first direction parallel to the horizontal plane, and the cassette 31 is parallel to the horizontal plane and orthogonal to the first direction. It is formed at a position that substantially coincides with the position when it is carried into the heating chamber 27 in the second direction. When the figure when the cassette 31 is viewed in a plane is formed, for example, in a substantially square shape, the groove portion 32 is formed at a position where the cassette 31 is substantially coincident even when the cassette 31 is carried in from any of the four sides. Has been done. By doing so, the operator does not have to worry about the orientation of the cassette 31 when carrying the cassette 31 into the thermofluorescent sheet reading device 1. Therefore, the burden on the operator when carrying in the cassette 31 is reduced. The groove portion 32 may have a structure that is locked to the cassette locking portion 36a included in the transport portion 36, and is not particularly limited, for example, a recess or a through hole.

Further, as shown in FIG. 7D, the frame body 34 is provided with a recess 33 on the lower surface 51. The concave portion 33 is formed so as to fit into a convex portion (not shown) provided in the heating chamber 27. That is, when the cassette 31 is conveyed to the heating chamber 27, it is used to determine the position of the cassette 31. As a result, the variation in the position of the cassette 31 in the heating chamber 27 is suppressed for each measurement of thermal fluorescence. The recess 33 may have a structure that is locked to the convex portion provided in the heating chamber 27, and is not particularly limited, for example, a recess or a through hole.

The cassette 31 may be formed with a recess or a hole for the operator to grasp in the cassette 31 so that the operator can easily handle the cassette 31.

Next, a modified example of the cassette according to the embodiment will be described.

FIG. 7F is a cross-sectional view showing a modified example of the cassette cut along the position corresponding to the line VII-VIIE of FIG. 7A. The same components as those in FIG. 7E are designated by the same reference numerals, and duplicate description will be omitted or simplified.

As shown in FIG. 7F, the cassette 31b further includes a protective sheet 61 on the cassette 31.

The protective sheet 61 is a sheet having a translucent property that transmits the fluorescence emitted from the heat fluorescent sheet 60. Further, when measuring the fluorescence emitted from the thermal fluorescence sheet 60, it is necessary to heat the thermal fluorescence sheet 60, and at that time, the protective sheet 61 is also heated. Therefore, the protective sheet 61 is heated. It should have a low expansion coefficient and heat resistance. The protective sheet 61 is made of, for example, polyethylene terephthalate (PET), polyimide, or the like. The protective sheet 61 is arranged between the thermofluorescent sheet 60 and the heat-resistant glass 35.

Here, the thickness of the spacer 43, the total thickness of the thermofluorescent sheet 60, and the thickness of the protective sheet 61 are substantially the same. In other words, the upper surface of the spacer 43 is substantially flush with the upper surface of the thermofluorescent sheet 60. That is, the spacer 43 and the thermofluorescent sheet 60 are arranged on the heat-resistant glass so that the upper surface of the spacer 43 and the upper surface of the thermofluorescent sheet 60 are flush with each other.

As a result, the thermofluorescent sheet pressing plate 40 can easily apply a uniform force to the entire thermofluorescent sheet 60. Further, when the heat fluorescent sheet pressing plate 40 conducts heat to the heat fluorescent sheet 60, the heat is likely to be uniformly applied to the entire heat fluorescent sheet 60. Therefore, the deformation of the thermofluorescent sheet 60 is suppressed.

FIG. 8 is a partially enlarged view showing an enlarged portion of the portion surrounded by the broken line VIII of FIG. Specifically, FIG. 8 is a diagram showing a transport unit 36 for transporting the cassette 31 from the heating chamber 27 to the cooling chamber 22 and a state in which the cassette 31 is installed in the heating chamber 27 and / or the cooling chamber 22.

As shown in FIG. 8, the thermofluorescent sheet reading device 1 includes a transport unit 36.

The transport unit 36 is formed so as to be movable in the thermofluorescent sheet reading device 1. Further, the transport unit 36 includes a driveable cassette locking unit 36a. The transport unit 36 and the cassette locking unit 36a are provided with a motor (not shown) or the like so that they can be driven, and are driven by instructions from the control unit 29.

FIG. 8A shows a state in which the cassette 31 is not installed in the thermofluorescent sheet reading device 1. FIG. 8B shows a state in which the cassette 31 holding the thermofluorescent sheet 60 is installed in the heating chamber 27 after being carried into the heating chamber 27 from the carry-in inlet 38 by an operator. FIG. 8C shows a state in which the cassette 31 holding the thermofluorescent sheet is moved to the cooling chamber 22 by the transport unit 36 and installed in the cooling chamber 22.

After the fluorescence measurement is completed, the transport unit 36 transports the cassette 31 holding the thermofluorescent sheet 60 from the heating chamber 27 to the cooling chamber 22. First, the transport unit 36 starts moving so as to approach the heating chamber 27. The transport unit 36 temporarily stops driving when it approaches the cassette 31 installed in the heating chamber 27. Next, the cassette locking portion 36a is driven, and the cassette locking portion 36a is locked in the groove portion 32 of the cassette 31. The transport unit 36 drives the cassette locking portion 36a in a state of being locked to the cassette 31, and transports the cassette 31 to the cooling chamber 22. The transport unit 36 stops after transporting the cassette 31 to the cooling chamber 22. The cassette locking portion 36a is driven so that the cassette 31 is not locked.

FIG. 8D shows a state in which the cassette 31 is installed in the cooling chamber 22 and the cassette 31a is newly installed in the heating chamber 27 by an operator. By doing so, the thermofluorescent sheet reading device 1 can heat the cassette 31a and cool the cassette 31 at the same time. The cassette 31 is installed in the cooling chamber 22 for a predetermined time, and then is taken out from the thermofluorescent sheet reading device 1 by an operator.

The transport portion 36 may have a mechanism in which the cassette locking portion 36a is locked in the groove portion 32 of the cassette 31 so that the cassette 31 can be transported from the heating chamber 27 to the cooling chamber 22, and the shape and the like are not particularly limited. ..

FIG. 9 is a block diagram showing a characteristic functional configuration and an air flow path of the thermofluorescent sheet reading device 1 according to the embodiment. The white arrows shown in FIG. 9 indicate the direction in which air flows. Further, in FIG. 9, substantially the same configurations described in FIGS. 1 to 8 are designated by the same reference numerals, and duplicate description will be omitted or simplified.

The thermofluorescent sheet reading device 1 includes an operation unit 5, a control unit 29, a storage unit 30, a heating unit 19, a heating chamber 27, an imaging unit 15, a first cooling fan 14, and a second cooling fan. 24, a cooling chamber 22, and a transport unit 36 are provided.

The operation unit 5 is a device that receives instructions from the operator.

The control unit 29 is a processing unit realized by a CPU or a control program.

The storage unit 30 is a portion that holds a control program, data, and the like, and is realized by a ROM (Read Only Memory) or a RAM (Random Access Memory). The storage unit 30 holds, for example, the temperature control conditions of the heating unit 19 and the image data acquired by the imaging unit 15. Here, the temperature control condition is a program in which the condition for holding the temperature of the heating unit 19 at a predetermined temperature for a predetermined time is set.

The heating unit 19 is for heating the heating chamber 27 into which the cassette 31 holding the thermofluorescent sheet 60 is carried, and includes a heater unit such as an electric heater.

The heating chamber 27 is a room (space) in which the thermofluorescent sheet 60 heated by the heating unit 19 is installed in order to measure the fluorescence emitted from the thermofluorescent sheet 60.

The image pickup unit 15 includes a camera having an image pickup element for measuring fluorescence, a lens 16 that collects fluorescence, and a filter 17 that transmits only a predetermined wavelength, and is installed below the heating unit 19.

The first cooling fan 14 is operated so as to feed air from the outside to the inside of the thermal fluorescence sheet reading device 1, and is installed adjacent to the imaging unit 15.

The second cooling fan 24 is operated so as to discharge air from the inside of the thermofluorescent sheet reading device 1 to the outside, and is installed adjacent to the cooling chamber 22.

The cooling chamber 22 is a room (space) installed for cooling the thermal fluorescence sheet 60 before carrying out the thermal fluorescence sheet 60 for which the fluorescence measurement has been completed to the outside of the thermal fluorescence sheet reading device 1.

The transport unit 36 is a mechanism for moving the cassette 31 from the heating chamber 27 to the cooling chamber 22.

With the above configuration, an air flow path is formed in the thermofluorescent sheet reading device 1 in the direction of the white arrow shown in FIG. That is, the air is taken into the housing 2 by the first cooling fan 14, passes near the imaging unit 15, and further passes near the heating unit 19. The air that has passed in the vicinity of the heating unit 19 passes through the cooling chamber 22 and is discharged to the outside of the housing 2 by the second cooling fan 24. As a result, the heat generated in the heating unit 19 is suppressed from being transferred to the imaging unit 15.

Next, the operation of the thermofluorescent sheet reading device 1 configured as described above will be described.

FIG. 10 is a flowchart showing a procedure for measuring fluorescence of the thermal fluorescence sheet reading device 1 according to the embodiment.

First, the operator installs the cassette 31 in which the thermofluorescent sheet 60 is held in the heating chamber 27 (S10).

Next, the control unit 29 that receives the instruction from the operator operates the heating unit 19 to heat the heating chamber 27 (S11). At this time, the control unit 29 drives the first cooling fan 14 and the second cooling fan 24. As a result, an air flow path is formed inside the thermofluorescent sheet reading device 1. Further, the control unit 29 drives the key unit 26 to prevent the door unit 3 from opening (S12). The temperature of the heating chamber 27 gradually rises, and fluorescence is emitted from the thermofluorescent sheet 60 as the temperature rises, and the imaging unit 15 detects the fluorescence.

Next, the control unit 29 stops the operation of the heating unit 19 when the fluorescence measurement is completed (S13). Then, the control unit 29 operates the light source 18 to irradiate the thermofluorescent sheet 60 with light. With the light source 18 irradiating the thermofluorescent sheet 60 with light, the imaging unit 15 detects the positioning mark attached to the thermofluorescent sheet 60 (S14).

Next, the transport unit 36 transports the cassette 31 from the heating chamber 27 to the cooling chamber 22 (S15).

Next, the control unit 29 operates the key unit 26 after a predetermined time set in advance has elapsed to unlock the door unit 3 (S16).

If there is a thermofluorescent sheet for which measurement is to be performed, the above procedure is repeated.

(Summary)
As described above, the cassette 31 according to the present invention is a cassette that holds the thermofluorescent sheet 60 when measuring the fluorescence emitted from the thermofluorescent sheet 60 irradiated with radiation. The cassette 31 transmits the fluorescence emitted by the thermofluorescent sheet 60, and has a flat plate-shaped glass 35 (heat-resistant glass 35) on which the thermofluorescent sheet 60 is placed on the upper surface thereof, and the upper surface of the glass 35 around the thermal fluorescence sheet 60. A spacer 43 to be placed and a flat plate-shaped thermofluorescent sheet pressing plate 40 that presses the thermofluorescent sheet 60 in surface contact with the lower surface thereof are provided. Further, the upper surface of the spacer 43 is flush with the upper surface of the thermofluorescent sheet 60.

As a result, the thermofluorescent sheet pressing plate 40 can easily apply a uniform force to the entire thermofluorescent sheet 60. Further, when the heat fluorescent sheet pressing plate 40 conducts heat to the heat fluorescent sheet 60, the heat is likely to be uniformly applied to the entire heat fluorescent sheet 60. Therefore, the deformation of the thermofluorescent sheet 60 is suppressed.

Further, the thickness of the spacer 43 and the thickness of the thermofluorescent sheet 60 may be substantially the same.

As a result, the thermofluorescent sheet pressing plate 40 can easily apply a uniform force to the entire thermofluorescent sheet 60.

Further, the cassette according to the present invention may include a flat plate-shaped protective sheet 61 that transmits fluorescence and is placed on the upper surface of the glass 35. In that case, the thermofluorescent sheet 60 is placed on the upper surface of the protective sheet 61. Further, the thickness of the spacer 43 and the total thickness of the thickness of the thermofluorescent sheet 60 and the thickness of the protective sheet 61 may be substantially the same.

As a result, the thermofluorescent sheet pressing plate 40 can easily apply a uniform force to the entire thermofluorescent sheet 60.

Further, the cassette 31 may include a frame body 34 that supports the glass 35 and the thermofluorescent sheet pressing plate 40. Further, when the heat fluorescent sheet pressing plate 40 is pressing the heat fluorescent sheet 60, the upper surface of the frame body 34 and the upper surface of the heat fluorescent sheet pressing plate 40 may be flush with each other.

As a result, when the heating portion 19 such as a heater is pressed against the upper part of the cassette 31, the force is likely to be uniformly applied to the upper surface of the cassette 31. That is, a uniform force is likely to be applied to the entire thermofluorescent sheet 60. Therefore, the deformation of the thermofluorescent sheet 60 is suppressed.

Further, the heat fluorescent sheet pressing plate 40 may have a flat plate-shaped heat conductive portion 41 in surface contact with the heat fluorescent sheet 60 and a frame portion 42 formed at an end portion of the heat conductive portion 41. Further, the heat conductive portion 41 may contain glass fiber and polytetrafluoroethylene. That is, glass fiber and polytetrafluoroethylene may be adopted as the material of the heat conductive portion 41.

As a result, the heat fluorescent sheet pressing plate 40 can easily efficiently conduct the heat generated from the heating unit 19 to the heat fluorescent sheet 60.

Further, the frame portion 42 and the frame body 34 may include a magnetic material on one side and a magnet 34a on the other side. Further, the frame portion 42 and the frame body 34 may be in opposite positions via the spacer 43.

By doing so, when the thermofluorescent sheet 60 is held in the cassette 31, the positions of the frame body 34 and the frame portion 42 are fixed by magnetic force. Therefore, it is not necessary to provide a locking portion for holding the thermofluorescent sheet 60. Therefore, the cassette 31 can hold the thermofluorescent sheet 60 in the cassette 31 with a simple structure.

Further, the cassette 31 may be substantially square in a plan view. Further, the frame body 34 may have a plurality of groove portions 32 on the upper surface thereof. When the cassette 31 is viewed in a plan view, the plurality of groove portions 32 may be formed at positions that substantially coincide with each other when the center of the cassette 31 is rotated by 90 degrees.

That is, in the cassette 31, the positions of the grooves 32 used for transporting the cassette 31 inside the thermofluorescent sheet reading device 1 are substantially the same in the first direction and the second direction orthogonal to the first direction. .. Therefore, when the operator carries the cassette 31 into the thermofluorescent sheet reading device 1, the operator is not restricted by the orientation of the cassette 31, so that the burden on the operator can be reduced.

Further, a recess 33 may be formed on the lower surface of the frame body 34. Specifically, the cassette 31 may include a recess 33 used to determine the position where the cassette 31 is installed during movement within the thermofluorescent sheet reader 1.

Thereby, the installation position of the cassette 31 in the thermofluorescent sheet reading device 1 can be determined with a simple configuration.

Further, the frame body 34 and the spacer 43 may be detachably fixed.

Thereby, the spacer 43 can be easily changed according to the thickness of the thermofluorescent sheet 60. That is, the cassette 31 according to the thickness of the thermofluorescent sheet 60 can be provided only by changing the spacer 43.

Further, the thermofluorescent sheet reading device 1 according to the present invention is a thermofluorescent sheet reading device for measuring fluorescence emitted from a thermofluorescent sheet irradiated with radiation, and includes a cassette 31.

This makes it possible to provide the thermal fluorescence sheet reading device 1 including the cassette 31 in which the deformation of the thermal fluorescence sheet 60 is suppressed.

(Other)
Although the thermofluorescent sheet reading device 1 of the present invention has been described above based on the embodiment, the present invention is not limited to this embodiment.

For example, the shape of the heating portion 19 is not particularly limited as long as it can uniformly press the upper surface of the cassette 31. For example, the lower surface of the heating unit 19 may have a portion in contact with the cassette 31 other than the surface in contact with the cassette 31. Specifically, the heating unit 19 may be provided with a plurality of locations in contact with the upper end (corner) of the cassette 31. By doing so, when the heating unit 19 presses the cassette 31, the position of the cassette 31 can be fixed by a plurality of contact points. Therefore, the variation in the position of the cassette 31 in the heating chamber 27 is suppressed for each measurement of thermal fluorescence.

As described above, as long as the gist of the present invention is not deviated, the present invention also includes a form in which various modifications that the parties can think of are applied to the present embodiment, and a form constructed by combining components in different embodiments.

The present invention can provide, for example, a cassette that can suppress deformation of the thermofluorescent sheet as a cassette that holds the thermofluorescent sheet.

1 Thermal fluorescent sheet reader 2 Housing 3, 3a Door 4 Inspection window 5 Operation unit 6 Air inlet 7 Cassette storage 8 Emergency stop switch 9a Cassette carry-in lamp 9b Cassette carry-out lamp 10 Heater energization lamp 11 Upper ventilation port 12 Air Outlet 13 Power supply / connector part 14 1st cooling fan 15 Imaging part 15a Holding plate 16 Lens 17 Filter 17a Filter plate 18 Light source 19 Heating part 20 Upper cooling fan 21 Through hole 22 Cooling room 23 Power supply unit 24 2nd cooling fan 25 Power supply Unit fan 26 Key part 26a Moving part 27 Heating chamber 28 Motor 29 Control part 30 Storage part 31, 31a, 31b Cassette 32 Groove 33 Recessed 34 Frame 34a Magnet 35 Heat-resistant glass (glass)
36 Transport part 36a Cassette locking part 37 Bending part 38 Carry-in entrance 40 Thermal fluorescent sheet pressing plate 41 Thermal conductive part 42 Frame part 43 Spacer 44 Spacer locking part 50, 50a Upper surface 51 Lower surface 60 Thermal fluorescent sheet 61 Protective sheet

Claims (10)

A cassette that holds the thermofluorescent sheet when measuring the fluorescence emitted from the thermofluorescent sheet irradiated with radiation.
A flat glass that transmits the fluorescence and has the thermal fluorescence sheet placed on the upper surface,
A spacer placed on the upper surface of the glass around the thermofluorescent sheet,
A flat plate-shaped thermofluorescent sheet pressing plate that presses against the thermofluorescent sheet in surface contact with the lower surface,
With
The upper surface of the spacer is a cassette that is flush with the upper surface of the thermofluorescent sheet. The thickness of the thermal phosphor sheet and the thickness of the spacer, cassette according to match claim 1. further,
A flat protective sheet that transmits the fluorescence and is placed on the upper surface of the glass is provided.
The heat phosphor sheet, said the thickness of the placed on the spacer on the upper surface of the protective sheet, the total thickness of the heat phosphor sheet thickness and the thickness of the protective sheet is according to match claim 1 cassette. further,
A frame body for supporting the glass and the thermofluorescent sheet pressing plate is provided.
3. Described cassette. The thermofluorescent sheet pressing plate has a flat plate-shaped heat conductive portion that comes into surface contact with the thermofluorescent sheet and a frame portion formed at an end portion of the heat conductive portion.
The cassette according to claim 4, wherein the heat conductive portion contains glass fiber and polytetrafluoroethylene. One of the frame portion and the frame body contains a magnetic material, and the other contains a magnet.
The cassette according to claim 5, wherein the frame portion and the frame body are located at positions facing each other via the spacer. The cassette is a positive rectangular in plan view,
The frame has a plurality of grooves on the upper surface and has a plurality of grooves.
When viewed from the plurality of groove portions, the cassette according to any one of claims 4-6, which is formed on the match position when rotating around the 90 degrees of the cassette. The cassette according to any one of claims 4 to 7, wherein a recess is formed on the lower surface of the frame. The cassette according to any one of claims 4 to 8, wherein the frame body and the spacer are detachably fixed to each other. A thermofluorescent sheet reading device comprising the cassette according to any one of claims 1 to 9 and measuring fluorescence emitted from a thermofluorescent sheet irradiated with radiation.

Images