JP2007040733A - Stimulable phosphor sheet sealing body, and manufacturing method of stimulable phosphor sheet sealing body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing body hardly influenced by an environment of an area where it is used, and having excellent preservability and no decline of an image performance, when a stimulable phosphor sheet is sealed by using a moisture-proof sealing film to form the sealing body, and a manufacturing method of the sealing body. <P>SOLUTION: This stimulable phosphor sheet sealing body formed by covering the stimulable phosphor layer side and the support side of the stimulable phosphor sheet having the stimulable phosphor layer on the support by a sealing member, and by sealing it by the sealing member under a depressurized condition has characteristics wherein the stimulable phosphor sheet sealing body has an internal pressure adjusting means for adjusting the internal pressure, and the air can be supplied into the stimulable phosphor sheet sealing body at a using time by the internal pressure adjusting means, to thereby adjust the internal pressure at the using time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a photostimulable phosphor sheet sealing body (hereinafter also referred to as a sealing body) in which the front surface, back surface, and peripheral edge of a stimulable phosphor sheet are sealed with a sealing member, and stimulable fluorescence. The present invention relates to a method for manufacturing a body sheet sealing body.

  Conventionally, so-called radiography using a silver salt has been used to obtain a radiographic image. Recently, a method for imaging a radiographic image without using a silver salt has been developed. In this method, the radiation transmitted through the subject is absorbed by the phosphor, and then the phosphor is excited by light or thermal energy, for example, so that the radiation energy accumulated by the absorption is emitted as fluorescence. And a method of detecting and imaging this fluorescence.

  Specifically, for example, as disclosed in US Pat. No. 3,859,527 and JP-A-55-12144, a plate having a photostimulable phosphor layer formed on a substrate is used. . This method applies radiation transmitted through the object to the photostimulable phosphor layer of this plate, accumulates radiation energy corresponding to the radiation transmittance of each part of the object in the stimulable phosphor layer, and stores the latent image (accumulated image). Then, the stimulable phosphor layer is scanned with stimulated excitation light (laser light is used) to release the radiation energy accumulated in each part as stimulated luminescence, and the intensity of this light For example, the signal may be photoelectrically converted to obtain an electrical signal, and this signal may be reproduced as a visible image on a recording material such as a silver halide photographic material or a display device such as a CRT. It may be played back as a hard copy.

  According to the above radiographic image reproduction method, it is possible to obtain a radiographic image with a much smaller exposure dose and an abundant amount of information as compared with a radiographic method using a combination of a conventional radiographic film and an intensifying screen. Has the advantage of being able to

  Thus, the stimulable phosphor is a phosphor that exhibits stimulating light emission when irradiated with excitation light after being irradiated with radiation, but practically, with excitation light having a wavelength in the range of 400 to 900 nm, Stimulable phosphors that exhibit stimulated emission in the wavelength range of 300 to 500 nm are generally used.

  Plates using these photostimulable phosphors release the stored energy by scanning the excitation light after storing the radiation image information, so that the radiation image can be stored again after scanning and can be used repeatedly. It is. In other words, while the conventional radiographic method consumes a radiographic film for each radiographing, this radiographic image conversion method uses plates repeatedly, which is advantageous in terms of resource protection and economic efficiency. .

  This plate has a dispersion type stimulable phosphor layer formed by a method of applying and drying a stimulable phosphor particle dispersion of a binder resin solution on a substrate, and a gas on the substrate. Some have a vapor-deposited type stimulable phosphor layer formed by a phase deposition method. In any case, the photostimulable phosphor layer of the plate has a high radiation absorption rate and light conversion rate, image Therefore, it is required to have good graininess and high sharpness.

  The vapor-deposited type stimulable phosphor layer is 100% of the stimulable phosphor compared to the dispersion-type photostimulable phosphor layer. High sensitivity and high radiation absorption give a plate with relatively low quantum mottle and excellent graininess. If the sensitivity is the same, the layer thickness can be reduced, and within the stimulable phosphor layer It is known that a plate having excellent sharpness can be obtained by reducing diffusion of radiation and excitation light.

  The plate using this photostimulable phosphor releases accumulated energy by irradiating with excitation light after accumulating radiation image information, so that radiation images can be accumulated again after scanning and can be used repeatedly. Is possible. In other words, the conventional radiographic method consumes a panicle film every time an image is taken, whereas this radiographic image conversion method repeatedly uses a radiographic image conversion panel, which leads to resource protection and economic efficiency. Is also advantageous.

  However, the photostimulable phosphor used for the plate generally has a high hygroscopic property, and is severely deteriorated even under a normal use environment. When moisture is absorbed, the sensitivity of the phosphor and the latent image deteriorate. In particular, it is known that a photostimulable phosphor formed by vapor deposition is particularly hygroscopic because it is not covered with a binder or the like. For this reason, in order to use it repeatedly for a long time, the moisture absorption correspondence of the plate has been examined. For example, a method of providing a sealing frame that surrounds the photostimulable phosphor layer on the support and bonding the sealing frame with glass is known (see Patent Document 1). However, the method described in Patent Document 1 is almost completely moisture-proof, but requires a certain amount of thickness, and thus has a disadvantage that image performance is deteriorated. In addition, a plate having a stimulable phosphor layer on a support is sandwiched between two moisture-proof protective films (sealing film), and formed between the plate and the moisture-proof protective film (sealing film). A technique is known in which the pressure of the space to be adjusted is reduced to 100 Pa or more and 60000 Pa or less and sealed (see Patent Document 2). The technique described in Patent Document 2 has an advantage that the plate can be thinned, the image performance is prevented from being deteriorated, and the image quality deterioration caused by vibration of the sealing material itself such as mechanical resonance is not caused. However, it has the following drawbacks.

  1) When the pressure is adjusted to 100 Pa or more and 60000 Pa or less and sealed, the sealing film adheres to the photostimulable phosphor layer depending on the region because there is a difference in atmospheric pressure in the environment of use, for example, high and low. Or the sealing film body swells and flatness cannot be obtained.

  2) In the close contact state, the stimulated excitation light reflected by the phosphor layer propagates in the planar direction in the sealing film and excites the phosphor in another location, which may reduce the sharpness.

  3) When the sealing film body swells and flatness cannot be obtained, sharpness may be reduced.

  4) If a certain amount of tension is not applied, the film surface is wavy and the image performance is degraded.

From these situations, when using a moisture-proof sealing film to seal a photostimulable phosphor sheet to make a sealed body, it has excellent storage stability and is not easily affected by the environment in which it is used. Development of a sealing body that does not deteriorate and a method for manufacturing the sealing body is desired.
JP 2004-77243 A JP 2002-286896 A

  The present invention has been made in view of the above circumstances, and its purpose is to provide excellent storage stability when a photostimulable phosphor sheet is sealed using a moisture-proof sealing film to form a sealed body. It is an object of the present invention to provide a sealed body and a manufacturing method of the sealed body that are not easily affected by the environment of the area in which the image quality is not deteriorated.

  The above object of the present invention has been achieved by the following constitution.

(Claim 1)
Covering the stimulable phosphor layer side and the support side of a stimulable phosphor sheet having a stimulable phosphor layer on a support with a sealing member, and sealing with the sealing member under reduced pressure conditions In the photostimulable phosphor sheet sealing body,
The photostimulable phosphor sheet sealing body has an internal pressure adjusting means for adjusting an internal pressure,
A photostimulable phosphor sheet encapsulant that is capable of adjusting an internal pressure during use by allowing the internal pressure adjusting means to supply air to the photostimulable phosphor sheet encapsulant during use.

(Claim 2)
2. The photostimulable phosphor sheet encapsulant according to claim 1, wherein an internal pressure during use of the photostimulable phosphor sheet encapsulant is −25 to −50 kPa which is an atmospheric pressure of a use environment. .

(Claim 3)
The internal pressure adjusting means is an intake valve, and the valve operation is stopped by a closing means before use, and by releasing the closing means at the time of use, air can be supplied to the photostimulable phosphor sheet sealing body. In addition, when the internal pressure of the photostimulable phosphor sheet sealing body reaches a predetermined internal pressure, the intake valve is closed, and the internal pressure of the photostimulable phosphor sheet sealing body can be adjusted. The photostimulable phosphor sheet sealing body according to claim 1 or 2.

(Claim 4)
The photostimulable phosphor sheet encapsulant according to any one of claims 1 to 3, wherein the photostimulable phosphor sheet encapsulant has a hygroscopic material disposed therein.

(Claim 5)
5. The sealing member according to claim 1, wherein the sealing member is a film material comprising at least one layer having a water vapor transmission rate of 0.5 g / m ² (24 h, 40 ° C., 90% RH) or less. The photostimulable phosphor sheet encapsulant described in the item.

(Claim 6)
A photostimulable phosphor sheet sealed by covering and stimulating the stimulable phosphor layer side and the support side of a stimulable phosphor sheet having a stimulable phosphor layer on a support. In the method for producing a photostimulable phosphor sheet encapsulant for producing a body using a production apparatus having a stimulable phosphor sheet supply step, a sealing member supply step, and a sealing step,
The sealing member supplied in the sealing member supplying step is provided with an internal pressure adjusting means,
In the sealing step, the photostimulable phosphor sheet sealing body is sealed under reduced pressure to an internal pressure capable of supplying air to the photostimulable phosphor sheet sealing body during use by the internal pressure adjusting means. Method.

(Claim 7)
The internal pressure of the photostimulable phosphor sheet sealing body sealed under reduced pressure in the sealing step is inhaled by the internal pressure adjusting means at the time of use, so that the internal pressure is −25 to −50 KPa, which is the atmospheric pressure of the use environment. The method for producing a photostimulable phosphor sheet encapsulant according to claim 6, which is obtained.

(Claim 8)
The internal pressure adjusting means is an intake valve, and the operation of the valve is stopped by a closing means before use, and the air is supplied to the photostimulable phosphor sheet sealing body by releasing the closing means at the time of use. The intake valve is closed when the internal pressure to the photostimulable phosphor sheet sealing body reaches a predetermined internal pressure, and the internal pressure of the photostimulable phosphor sheet sealing body can be adjusted. The method for producing a photostimulable phosphor sheet encapsulant according to claim 6 or 7, characterized in that:

(Claim 9)
The photostimulable phosphor sheet sealing body according to any one of claims 6 to 8, wherein the photostimulable phosphor sheet sealing body has a hygroscopic material inside. Method.

(Claim 10)
The said sealing member is a film material which consists of at least 1 layer whose water-vapor-permeation rate is 0.5 g / m < ² > (24h, 40 degreeC, 90% RH) or less, The any one of Claims 6-9 characterized by the above-mentioned. A method for producing a photostimulable phosphor sheet encapsulant as described in the item.

  When using a moisture-proof sealing film to seal a photostimulable phosphor sheet to make a sealed body, it has excellent storage stability, is hardly affected by the environment in which it is used, and does not degrade image performance It is possible to provide a method for manufacturing a body and a sealing body, and it is possible to record images stably and to improve reliability.

  Embodiments according to the present invention will be described with reference to FIGS. 1 to 4, but of course the present invention is not limited thereto.

  FIG. 1 is a schematic view of a sealed body in which a stimulable phosphor sheet is sealed with a sealing film. FIG. 1A is a schematic perspective view of a sealed body in which a stimulable phosphor sheet is sealed with a sealing film. FIG. 1B is an enlarged schematic partial sectional view taken along line AA ′ of FIG. 1A, and uses a stimulable phosphor sheet in which a stimulable phosphor layer is produced by a coating method. This is the case. FIG. 1C is an enlarged schematic partial sectional view taken along the line AA ′ of FIG. 1A, and shows a case where a plate manufactured by a vapor deposition method is used. In this figure, the internal pressure adjusting means is omitted.

  The sealing body in FIG. 1A will be described. In the figure, 1 indicates a sealing body. 101a shows the sealing film of the sealing member on the surface side (stimulable phosphor layer side) of the stimulable phosphor sheet, and 101b shows the sealing film on the back side (support side) of the stimulable phosphor sheet. The photostimulable phosphor sheet is sealed by welding a sealing film around the photostimulable phosphor sheet. The internal pressure adjusting means (not shown) is attached to the sealing film on the back side (support side) of the stimulable phosphor sheet. The internal pressure adjusting means will be described with reference to FIGS.

  A cross-sectional view shown in FIG. 1B will be described. In addition, this figure has shown the case where the material which mainly has a thermoplastic resin is used for a support body. Reference numeral 102a denotes a photostimulable phosphor sheet. The photostimulable phosphor sheet 102a has an intermediate layer 102a2, a photostimulable phosphor layer 102a3, and a protective layer 102a4 in this order on a support 102a1. In this case, the sealing body 1 is a stimulable phosphor sheet composed of a sealing film 101a of a sealing member covering the protective layer 102a4 side and a sealing film 101b of a sealing member covering the back side of the support 102a1. The sealing body 1a is formed by sandwiching 102a and thermally welding the sealing film 101a (101b) around the photostimulable phosphor sheet 102a.

  The thickness of the support 102a1 is generally 100 to 5000 μm, the thickness of the intermediate layer 102a2 is 1 to 30 μm, the thickness of the stimulable phosphor layer 102a3 is 100 to 1000 μm, and the thickness of the protective layer 102a4d is generally 1 to 200 μm. This is a preferable range.

  The photostimulable phosphor layer is composed of a stimulable phosphor (a phosphor that emits photostimulative light according to the amount of initial irradiation energy when excited by light after the initial irradiation of light or radiation) and a binder. In order to mix and apply at a preferred ratio, it is prepared with an organic solvent (other additives such as a dispersing agent and plasticizer are also preferably mixed), applied to a support such as a resin sheet, and a stimulable phosphor. It formed by the apply | coating method which forms a layer.

  A cross-sectional view shown in FIG. 1C will be described. This figure shows the case where a metal plate material mainly made of aluminum or a material mainly made of carbon is used for the support. Reference numeral 102b denotes a photostimulable phosphor sheet. The photostimulable phosphor sheet 102b has a photostimulable phosphor layer 102b2 and a protective layer 102b3 in this order on a support 102b1. In this case, the sealing body 1 is a stimulable phosphor sheet composed of a sealing film 101a of a sealing member covering the protective layer 102b3 side and a sealing film 101b of a sealing member covering the back side of the support 102b1. The sealing body 1b is formed by sandwiching 102b and thermally welding the sealing film 101a (101b) around the stimulable phosphor sheet 102b.

  It is generally considered that the thickness of the support 102b1 is generally 50 to 1000 μm, the thickness of the stimulable phosphor layer 102b2 is 100 to 1000 μm, and the thickness of the protective layer 102b3 is generally 1 to 200 μm. Moreover, when providing an intermediate | middle layer on the support body 102b1, 1-10 micrometers is preferable. For the photostimulable phosphor layer, the photostimulable phosphor was formed on the support by vapor deposition (evaporation, sputtering, etc.).

  In the present invention, as shown in the figure, a stimulable phosphor sheet in which a stimulable phosphor layer is formed on a support by a coating method or a vapor deposition method is sealed with a sealing film of a sealing member. It is related with the sealing body which made it possible to adjust the internal pressure at the time of use of the prepared sealing body with an internal pressure adjustment means (refer FIG. 2, FIG. 3).

  FIG. 2 is a schematic sectional view of a sealing body having an internal pressure adjusting means.

  In the figure, 2 indicates a sealing body. The sealing body 2 includes a stimulable phosphor sheet 201 and an internal pressure adjusting unit 202. Reference numeral 203 denotes a sealing film of a sealing member on the front surface side (stimulable phosphor layer side) of the stimulable phosphor sheet 201, and 204 denotes a seal on the back side (support side) of the stimulable phosphor sheet 201. A stop film is shown, and the photostimulable phosphor sheet is sealed by welding a sealing film 203 (204) around the photostimulable phosphor sheet. Reference numeral 206 denotes a film-like moisture absorbent provided on the back side of the support 201a. The position where the hygroscopic material is disposed may be the back surface side of the support 201a or the gap 205 depending on the type of the hygroscopic material to be used. This figure shows the case where the hygroscopic material is in the form of a film and is provided on the back side of the support 201a. Reference numeral 207 denotes a closing means for the internal pressure adjusting means 202. The closing means 207 is not particularly limited. For example, a thick film adhesive tape without air permeability (for example, a commercially available vinyl tape, nylon tape, etc.), a cap fitted into the first air inlet 202c (see FIG. 3), etc. Is mentioned. The photostimulable phosphor sheet 201 has an intermediate layer 201b, a photostimulable phosphor layer 201c, and a protective layer 201d in this order on a support 201a. Note that the intermediate layer 201b may not be necessary.

  The position where the internal pressure adjusting means 202 is disposed is not particularly limited. For example, in the gap 205 around the stimulable phosphor sheet 201 of the sealing film 203 of the sealing member that covers the upper surface of the stimulable phosphor sheet 201. Corresponding position, a position corresponding to the void around the stimulable phosphor sheet 201 of the sealing film 204 of the sealing member that covers the back surface of the stimulable phosphor sheet 201 (the void excluding the support 201a). Is mentioned. This figure shows the internal pressure adjusting means 202 in the space around the photostimulable phosphor sheet 201 (the space excluding the support 201a) of the sealing film 204 of the sealing member covering the back surface of the photostimulable phosphor sheet 201. The case where is provided is shown.

  The internal pressure at the time of manufacturing the sealing body shown in FIGS. 1 and 2 can be adjusted to the internal pressure at the time of use by allowing the internal pressure adjusting means to supply air to the sealing body at the time of use. The internal pressure during use of the encapsulant is used in consideration of the flatness of the encapsulating film, stable image performance, degradation in image performance due to adhesion between the encapsulating film and the stimulable phosphor layer, storage stability, etc. The ambient atmospheric pressure is preferably −25 to −50 KPa. It is particularly preferable that the internal pressure of the sealing body at the time of use is set to −25 to −50 KPa, which is the atmospheric pressure of the use environment, in the case of a vapor deposition type in which the photostimulable phosphor layer is formed by a vapor deposition method.

  FIG. 3 is an enlarged schematic view of a portion indicated by S in FIG. FIG. 3A is an enlarged schematic view of a portion indicated by S in FIG. 2 showing a state before use. FIG. 3B is an enlarged schematic view of a portion indicated by S in FIG. 2 showing a state in which the closed state of the internal pressure adjusting means is released by the closing means. FIG. 3C is an enlarged schematic view of a portion indicated by S in FIG. 2 showing a state where a predetermined internal pressure is reached after the closed state of the internal pressure adjusting means is released by the closing means.

  In the figure, reference numeral 202 denotes an intake valve of the internal pressure adjusting means. The intake valve 202 has a cylindrical main body 202a having a first intake port 202c and a second intake port 202d at both ends, and an attachment portion 202b attached around the lower portion of the main body 202a. It is being fixed to the sealing film 204 via. The fixing method to the sealing film 204 is not particularly limited, and examples thereof include an adhesive and heat welding. The first air inlet 202c is attached to the sealing body such that the first air inlet 202c is outside the sealing film 204 (outside the sealing body) and the second air inlet 202d is inside the sealing film 204 (inside the sealing body). ing. Reference numeral 202e denotes a coil spring housed in the main body 202a, and 202f denotes a sealing member that seals the first air inlet 202c. The sealing member 202f is disposed between the coil spring 202e and the first intake port 202c.

  The coil spring 202e has a property of expanding and contracting due to the difference between the internal pressure and the external pressure of the sealing body. Therefore, in order to adjust the internal pressure of the sealing body to the internal pressure required at the time of use, it is necessary to select the coil spring 202e corresponding to the required internal pressure. In the present invention, the internal pressure at the time of use of the sealing body is a differential pressure (−25) from the required atmospheric pressure in order to obtain a sealing body that can be adjusted to −25 to −50 KPa of the atmospheric pressure of the use environment. It is necessary to select the coil spring 202e according to ~ -50KPa).

  A description will be given of the state shown in FIG. Since the non-breathable thick film adhesive tape of the closing means 207 is adhered and sealed to the first intake port 202c of the intake valve 202, the inside and the outside of the sealing body are blocked. For this reason, since there is no pressure difference between the inside and the outside of the sealing body, the coil spring 202e is extended, and the sealing member is pressed against the first air inlet side (in the direction of the arrow in the figure) to produce the internal pressure of the sealing body. It is possible to maintain the reduced pressure state at the time.

  A description will be given of the state shown in FIG. By removing the thick film adhesive tape of the closing means attached to the first intake port 202c of the intake valve 202, the closed state of the intake valve 202 is released, and the first intake port 202c enters the inside of the sealing body. It will be in the state where outside air can flow. At this time, for example, when the internal pressure of the sealing body is 30 KPa and the atmospheric pressure of the outside air is 101.3 KPa, the differential pressure is 71.3 KPa. For example, when the coil spring 202e used for the internal pressure adjusting means 202 uses a differential pressure of 30 KPa, the coil spring contracts until the differential pressure reaches 30 KPa, and the first intake port 202c sealed by the sealing member 202f is released. The outside air flows from the first intake port 202c into the sealed body through the second intake port 202d (in the direction of the arrow in the figure).

  A description will be given of the state shown in FIG. When the difference between the internal pressure of the sealing body and the atmospheric pressure of the outside air reaches 30 KPa from the state shown in FIG. 3B, the coil spring 202e extends (in the direction of the arrow in the figure), and the sealing member 202f One intake port 202c is sealed, and the internal pressure of the sealing body can be adjusted. The internal pressure of the sealing body can be adjusted to −25 to −50 KPa, which is the atmospheric pressure of the use environment, depending on the type of coil spring 202e used. Next, the method for producing the photostimulable phosphor sheet sealing body of the present invention will be described with reference to FIG.

  FIG. 4 is a schematic flow diagram showing the process until the sealing body shown in FIG. 2 is manufactured.

  In S1, a sealing film 203 covering the front surface of the photostimulable phosphor sheet 201 and a sealing film 204 covering the back surface are prepared. When the photostimulable phosphor sheet 201 is encapsulated in the sealing film 204 covering the back surface, a gap portion of the sealing film 204 formed around the photostimulable phosphor sheet 201 (support of the photostimulable phosphor sheet 201 is supported). The internal pressure adjusting means 202 is attached at a position corresponding to (except the body). The size of the sealing film to be used is preferably 10 to 30% larger than the size of the photostimulable phosphor sheet 201. Although this figure has shown the case where the sealing film supplied is a sheet form, it may be a bag form.

  S2 shows a state in which the photostimulable phosphor sheet 201 is placed on the sealing film 204 with the photostimulable phosphor layer facing upward. At this time, it is necessary to prevent the photostimulable phosphor sheet 201 from being placed on the intake valve 202. Moreover, it is possible to arrange | position a hygroscopic material to the circumference | surroundings or back side of the photostimulable phosphor sheet 201 as needed. This figure shows the case where a film-like hygroscopic material (not shown) is placed on the back side of the photostimulable phosphor sheet 201.

  In step S3, the sealing film 203 covering the stimulable phosphor layer side of the stimulable phosphor sheet 201 on the sealing film 204 is placed on the stimulable phosphor layer in accordance with the sealing film 204, The state which pinched the property fluorescent substance sheet 201 is shown.

  S4 shows the state which sealed by sealing with the sealing film 204 using the heat sealer, pressing the sealing film 203 around the photostimulable phosphor sheet 201 with an elastic member under reduced pressure conditions. Reference numerals 208a to 208d denote sealing portions. The sealing is performed under the condition that the internal pressure of the photostimulable phosphor sheet sealing body is reduced by the intake valve 202 so that the internal pressure of the stimulating phosphor sheet sealing body can be adjusted to −25 to −50 KPa, which is the atmospheric pressure of the usage environment. Sealing may be performed on four sides simultaneously or on each side. It is possible to select appropriately according to the type of heat sealer to be used. In addition, it is preferable to perform the process of S1-S4 using a decompression chamber type vacuum packaging machine.

  In S5, by performing makeup trimming along the sealing portions 208a to 208d, a final form sealing body shown in FIG. 1A is obtained. In addition, it is preferable to perform makeup | decoration cutting in another process after taking out a sealing body from a decompression chamber type vacuum packaging machine, and cooling. The sealed body obtained by the method shown in this figure is put in a moisture-proof bag using aluminum foil and stored until it is used in a sealed state. When using, the moisture-proof bag is opened and the sealed body is taken out. After adjusting to a predetermined internal pressure by the intake valve, it is stuck on a tray of a predetermined size to be stored as a stimulable phosphor panel in a cassette and used in an imaging apparatus.

  As shown in FIGS. 1 to 4, the internal pressure during use of the sealing body is reduced and sealed so that the internal pressure can be adjusted to −25 to −50 KPa, which is the atmospheric pressure of the use environment, and sealed when used. The following effects can be obtained by using the internal pressure adjusting means provided on the stationary body at a predetermined internal pressure.

  1) Since there is a difference in atmospheric pressure in the environment of the area to be used, for example, in highlands and lowlands, the sealing film adheres to the photostimulable phosphor layer or the sealing film body swells and flatness is obtained depending on the area. This makes it possible to prevent the loss of quality and eliminates the difference in quality due to the difference in the area of use, making it possible to obtain stable image performance.

  2) When not in use (during storage), the sealing film does not adhere to the photostimulable phosphor layer, and the brightness of the photostimulable phosphor layer is lowered by the water vapor that has slightly permeated through the sealing film. It is possible to prevent the deterioration of quality and maintain the quality performance. This is particularly effective in the case of a vapor deposition type in which the photostimulable phosphor layer is formed by a vapor deposition method.

  3) Since the internal pressure of the photostimulable phosphor sheet can be adjusted to the required internal pressure at the time of use, the sealing film can be prevented from being loosened and adhered to the photostimulable phosphor layer. When the stop film is in close contact with the photostimulable phosphor layer, it is possible to reduce the sharpness by exciting the photostimulable phosphor layer at another location by propagating the photostimulated excitation light in the plane direction in the sealing film. It has become possible to prevent this, and the performance of the original photostimulable phosphor sheet can be brought out during use.

  4) Since the complicated internal pressure adjustment of the photostimulable phosphor sheet during production of the photostimulable phosphor sheet is not required, the production efficiency can be improved.

  Next, the photostimulable phosphor sheet, sealing film, and hygroscopic material constituting the sealing body according to the present invention will be described. It is preferable that the sealing film which coat | covers the photostimulable phosphor layer side has the excitation light absorption layer colored so that excitation light may be absorbed, and also haze rate is 0.2 to 6%. Furthermore, it is preferable that the light transmittance in the excitation light wavelength region of a sealing film is 98 to 50% of the light transmittance of the equivalent sealing film which does not have an excitation light absorption layer.

The water vapor transmission rate of the sealing film is preferably 0.5 g / m ² (24 h, 40 ° C., 90% RH) or less in consideration of maintaining the performance of the stimulable phosphor during storage. In the present invention, 0.5 g / m ² (24 h, 40 ° C., 90% RH) or less means that the water vapor transmission rate is as close as possible to 0 g / m ² (24 h, 40 ° C., 90% RH), It is possible to select the value of water vapor permeability as appropriate from the thickness and cost of the sealing film. In order to obtain a water vapor transmission rate of 0.5 g / m ² (24 h, 40 ° C., 90% RH) or less, it is preferable to use a laminated material having an inorganic vapor deposition film. Thin film handbooks p879-p901 (Japan Society for the Promotion of Science), vacuum technology handbooks p502-p509, p612, p810 (Nikkan Kogyo Shimbun), vacuum handbook revised editions p132-p134 (ULVAC Japan Vacuum Technology KK) Inorganic films as described in (1). For example, Cr ₂ O ₃ , Si _x O _y (x = 1, y = 1.5 to 2.0), Ta ₂ O ₃ , ZrN, SiC, TiC, PSG, Si ₃ N ₄ , single crystal Si, amorphous Si, W, AI ₂ O ₃ or the like can be used.

  The sealing film used on the side of the stimulable phosphor layer for sealing the stimulable phosphor sheet is for protecting the stimulable phosphor layer of the stimulable phosphor sheet from humidity and In order to extract an image of a subject from the stimulable phosphor layer, a transparent laminated material including at least one inorganic vapor deposition layer as described in JP-A-6-95302 is more preferably used from the viewpoint of moisture resistance. Moreover, the sealant layer that contacts the sealing film used on the support side needs to be laminated with a heat-meltable resin film.

These inorganic vapor deposition films include thin film handbooks p879-p901 (Japan Society for the Promotion of Science), vacuum technology handbooks p502-p509, p612, p810 (Nikkan Kogyo Shimbun), vacuum handbook revised editions p132-p134 (ULVAC Nippon Vacuum Technology K.K. Examples thereof include inorganic films as described in K). For example, Cr ₂ O ₃ , Si _x O _y (x = 1, y = 1.5 to 2.0), Ta ₂ O ₃ , ZrN, SiC, TiC, PSG, Si ₃ N ₄ , single crystal Si, amorphous Si, W, AI ₂ O ₃ or the like is used.

  The thermoplastic resin film used as the base material on which the inorganic vapor deposition layer is provided includes ethylene tetrafluoroethyl copolymer (ETFE), high density polyethylene (HDPE), stretched polypropylene (0PP), polystyrene (PS), polymethyl methacrylate (PMMA). ), Stretched nylon (ONy), polyethylene terephthalate (PET), polycarbonate (PC), polyimide, polyether styrene (PES), and other film materials used for general packaging films can be used.

  As a thermoplastic resin film laminated via an inorganic vapor deposited film sheet, a polymer film used as a general packaging material (for example, a polymer film described in Toray Research Center, Inc., a new development of functional packaging materials) is used. Density polyethylene (LDPE), HDPE, linear low density polyethylene (LLDPE), medium density polyethylene, unstretched polypropylene (CPP), OPP, ONy, PET, cellophane, polyvinyl alcohol (PVA), stretched vinylon (OV), ethylene- Vinyl acetate copolymer (EVOH), vinylidene chloride (PVDC), etc. can be used.

  As these thermoplastic resin films, a multilayer film made by co-extrusion with a different film, a multilayer film made by laminating at different stretching angles, etc. can be used as needed. Further, it is naturally possible to combine the density and molecular weight distribution of the film used to obtain the required physical properties.

  As the innermost thermoplastic resin film, it is preferable to use LDPE, LLDPE produced by using LDPE, LLDPE and a metallocene catalyst, or a film using a mixture of these films and HDPE film.

  Since the sealing film used on the support surface side improves moisture resistance, it is preferable to use an opaque laminated film which is the same except that an aluminum foil is used instead of the inorganic vapor layer described above.

  As a method for producing the laminated film, various generally known methods are used as a method of laminating other films via a film on which an inorganic material is deposited and a film on which an aluminum foil is laminated, for example, wet lamination. It can be made by using a method, a dry laminating method, a hot melt laminating method, an extrusion laminating method, or a thermal laminating method.

  As the colorant used for the sealing film, one having a characteristic of absorbing excitation light in the wavelength region of excitation light of the plate is used. Preferably, the excitation light absorption layer is provided so that the light transmittance in the excitation light wavelength region of the sealing film is 98% to 50% of the light transmittance of an equivalent sealing film having no excitation light absorption layer. desirable. When the light transmittance exceeds 98%, the effect of the present invention is small. When the light transmittance is less than 50%, the brightness of the plate rapidly decreases.

  Incidentally, it is presumed that the fact that there is not much decrease in luminance at a transmittance of 50% or more is related to the fact that the information of the radiographic image recorded on the plate is unevenly distributed on the plate surface side. Which colorant is used depends on the type of stimulable phosphor used in the plate, but as the stimulable phosphor for the plate, a wavelength of 300 to 500 nm is usually generated by excitation light having a wavelength in the range of 400 to 900 nm. A phosphor exhibiting stimulated emission in the wavelength range is used. For this reason, a blue to green organic or inorganic colorant is usually used as the colorant.

Examples of blue to green organic colorants include Zavon First Blue 3G (Hoechst), Estrol Brill Blue N-3RL (Sumitomo Chemical Co., Ltd.), Sumiacryl Blue F-GSL (Sumitomo Chemical Co., Ltd.) )), D & C Blue No1 (made by National Aniline), Spirit Blue (made by Hodogaya Chemical Co., Ltd.), Oil Blue No603 (made by Orient Co., Ltd.), Kitton Blue A (made by Ciba Geigy), Eisen Catillon Blue GLH (Hodogaya Chemical Co., Ltd.), Lake Blue A, F, H (Kyowa Sangyo Co., Ltd.), Rhodaline Blue 6GX (Kyowa Sangyo Co., Ltd.), Brimocyanin 6GX (Inabata Sangyo Co., Ltd.) ), Brill Acid Green 6BH (Hodogaya Chemical Co., Ltd.), Cyanine Blue BNRS (Toyo Ink Co., Ltd.), Lionol Blue SL (Toyo) Made Nki Co., Ltd.) and the like. Examples of blue to green inorganic colorants include, but are not limited to, ultramarine blue, cobalt blue, cerulean blue, chromium oxide, and TiO ₂ —ZnO—CoO—NiO pigments.

Examples of the support used for the photostimulable phosphor sheet include thermoplastic resin films, metal sheet materials, carbon-based materials, simple substances such as paper, and composites thereof. Examples of the thermoplastic resin plastic film include cellulose acetate film, polyester film, polyethylene terephthalate film, polyamide film, polyimide film, triacetate film, polycarbonate film and other plastic films, aluminum foil, aluminum alloy foil and other metal sheets, general paper and For example, photographic paper, coated paper, or printing paper such as art paper, baryta paper, resin coated paper, paper sized with a polysaccharide as described in Belgian Patent No. 784,615, Examples thereof include pigment paper containing a pigment such as titanium dioxide, and processed paper such as paper sized with polyvinyl alcohol. As composite products, a support with a polyimide layer on the surface of an aluminum plate, a support with a polyimide layer on the surface of a mixed resin plate mainly made of carbon, and a support with an inorganic vapor deposition layer on the surface of an aluminum plate The support body etc. which provided the polyimide layer in the surface of the body and the mixed resin board which mainly has carbon, and also provided the inorganic vapor deposition layer are mentioned. Examples of the inorganic deposition layer include inorganic nitrides such as BN and Si ₃ N ₄ , inorganic carbides such as SiC, TiC, and WC, inorganic oxides such as MgO, CaO, and B ₂ O ₃ , and inorganic fluorides such as BaF _2. It is possible to obtain at least one inorganic compound selected from these inorganic compounds by a vapor deposition method such as vacuum evaporation or sputtering. Among these, a plastic film is preferable as a flexible support from the viewpoint of ease of processing and handleability.

  The thickness of the flexible support varies depending on the material of the flexible support used, but is generally 80 to 1000 μm, and more preferably 80 to 500 μm from the viewpoint of handling. It is. The surface of these supports may be a smooth surface or a mat surface.

  The photostimulable phosphor layer is composed of a binder and photostimulable phosphor particles. The “stimulable phosphor” forming the photostimulable phosphor layer is an optical, thermal, mechanical, scientific, or electrical device after the first light or high energy radiation is irradiated. A stimulable phosphor that exhibits stimulated emission corresponding to the amount of irradiation of initial light or high-energy radiation by stimulation (stimulated excitation). From a practical aspect, a stimulable phosphor that exhibits stimulated emission by light stimulation (stimulated excitation) is preferred, and stimulated fluorescence that exhibits stimulated emission by stimulated excitation light having a wavelength of 500 nm or more and 1 μm or less. The body is preferred.

  The method for forming the photostimulable phosphor layer on the support includes a coating method and a vapor deposition method, and can be selected as necessary. As an example of the stimulable phosphor used for forming the stimulable phosphor layer by a coating method, compounds described in JP-A-2002-277596 can be mentioned. Examples of stimulable phosphors used for forming a stimulable phosphor layer by vapor deposition are, for example, JP-A-59-75200, 61-72087, 61-73786, 61. -73787, Unexamined-Japanese-Patent No. 2004-22651, etc. are mentioned.

  As a coating method, usual coating means such as a doctor blade, a roll coater, a knife coater, a comma coater, a lip coater and the like can be used.

Examples of the vapor deposition method include an evaporation method, a sputtering method, and a CVD method. In the vapor deposition method, after the substrate is placed in the vapor deposition apparatus, the inside of the apparatus is evacuated to a vacuum of about 1.333 × 10 ⁻⁴ Pa, and then at least one of the stimulable phosphors is subjected to resistance heating, electron The photostimulable phosphor is deposited to a desired thickness on the surface of the support by heating and evaporating by a method such as a beam method. As a result, a photostimulable phosphor layer containing no binder is formed, but it is also possible to form the photostimulable phosphor layer in a plurality of times in the vapor deposition step. In the vapor deposition process, vapor deposition can be performed using a plurality of resistance heaters or electron beams. In the vapor deposition method, a stimulable phosphor material is vapor-deposited using a plurality of resistance heaters or electron beams to synthesize a desired stimulable phosphor on a substrate, and at the same time, a stimulable phosphor layer is formed. It is also possible to form. Further, in the vapor deposition method, the substrate may be cooled or heated as necessary during vapor deposition. Further, the stimulable phosphor layer may be heat-treated after the vapor deposition.

In the sputtering method, after the base material is installed in the sputtering apparatus, the inside of the apparatus is once evacuated to a vacuum degree of about 1.333 × 10 ⁻⁴ Pa, and then Ar, Ne are used as sputtering gases. An inert gas such as is introduced into the apparatus to obtain a gas pressure of about 1.333 × 10 ⁻¹ Pa. Next, the stimulable phosphor is deposited to a desired thickness on the surface of the support by sputtering using the stimulable phosphor as a target. In this sputtering process, it is possible to form the photostimulable phosphor layer in a plurality of times in the same manner as the vapor deposition method, and by using each of them simultaneously or sequentially, the target is sputtered to produce the photostimulable phosphor layer. It is also possible to form In the sputtering method, a plurality of photostimulable phosphor materials can be used as a target, and these can be sputtered simultaneously or sequentially to form a desired photostimulable phosphor layer on a support. If necessary, reactive sputtering may be performed by introducing a gas such as O ₂ or H ₂ . Furthermore, in the sputtering method, the substrate may be cooled or heated as necessary during sputtering. Alternatively, the photostimulable phosphor layer may be heat-treated after the end of sputtering.

  In the CVD method, the target stimulable phosphor or organometallic compound containing the stimulable phosphor raw material is decomposed with energy such as heat and high-frequency power, so that no stimulant containing a binder is contained on the support. In any case, the photostimulable phosphor layer can be vapor-grown into independent elongated columnar crystals with a specific inclination with respect to the normal direction of the support. In the present invention, the vapor deposition method is preferably used as the vapor deposition method.

  The photostimulable phosphor layer according to the present invention may have a protective layer. The protective layer may be formed by directly applying a coating solution for the protective layer onto the photostimulable phosphor layer, or a protective layer separately formed in advance may be bonded onto the photostimulable phosphor layer. Or you may take the procedure of forming a photostimulable phosphor layer on the protective layer formed separately.

Materials for the protective layer include cellulose acetate, nitrocellulose, polymethyl methacrylate, polyvinyl butyral, polyvinyl formal, polycarbonate, polyester, polyethylene terephthalate, polyethylene, polyvinylidene chloride, nylon, polytetrafluoroethylene, polytrifluoride-ethylene chloride Ordinary protective layer materials such as tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylonitrile copolymer are used. The protective layer may be formed by laminating inorganic substances such as SiC, SiO ₂ , SiN, Al ₂ O ₃ by vapor deposition, sputtering, or the like. The thickness of these protective layers is generally preferably about 0.1 to 2000 μm. Moreover, what has good translucency and can be formed in a sheet form can be used. Examples thereof include plate glass such as quartz, borosilicate glass and chemically tempered glass, and organic polymers such as PET, OPP and polyvinyl chloride.

The hygroscopic material according to the present invention is not particularly limited, for example, a hygroscopic film made of a hygroscopic polymer such as polyvinyl alcohol, sodium polyacrylate, polyacrylamide as described in JP-A-1-199389, As described in JP-A-4-181588, A type silica gel, B type silica gel, silica gel, alumina gel, silica-alumina gel (SiO ₂ and Al ₂ O ₃ as described in JP 2003-340233 A). In which the sum of the composition ratios of SiO ₂ and Al ₂ O ₃ is 50% or more), a porous hygroscopic material such as activated carbon or a hygroscopic material mixture, and these porous hygroscopic materials or hygroscopic material mixtures Sheet-shaped or pellet-shaped hygroscopic material, non-woven fabric, using polytetrafluoroethylene or hygroscopic polymer as a binder Etc. The.

  Examples The effects of the present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Example 1
<Production of photostimulable phosphor sheet>
(Preparation of base material)
A substrate having a polyimide layer provided on the surface of an aluminum plate having a thickness of 1 mm and a size of 45 cm × 45 cm was prepared.

(Production of photostimulable phosphor sheet)
Using a stimulable phosphor (CsBr: 0.001Eu) as a vapor deposition source, using a vapor phase deposition apparatus, introducing Ar gas and adjusting the degree of vacuum to 0.133 Pa, the distance between the base material and the raw material container was changed. 60 cm, the substrate is rotated at a rotation speed of 10 rpm, the temperature in the raw material container is kept at 750 ° C. while keeping the temperature of the substrate at about 150 ° C., and the film thickness of the stimulable phosphor layer is When the thickness reached 300 μm, evaporation of the raw material was terminated, the vapor deposition chamber was returned to atmospheric pressure, and a plate having a photostimulable phosphor layer formed on a substrate was produced.

<Preparation of sealing film>
Two films having a multilayer structure of PET 12 μm / alumina-deposited PET 12 μm / CPP 30 μm, which were 20% larger than the size of the stimulable phosphor sheet, were prepared as the sealing film. An intake valve (adjusted internal pressure: −30 KPa of atmospheric pressure) of internal pressure adjusting means shown in FIG. 3 was attached to the sealing film on the support side of the photostimulable phosphor sheet. The first intake port of the intake valve was sealed using nylon tape as a closing means.

<Preparation of hygroscopic material>
A hygroscopic material in the form of a film sheet cut to the size of the substrate was prepared. The hygroscopic material used was a dry keep sheet manufactured by Sasaki Chemicals.

<Preparation of sealing body>
Prepared using a vacuum chamber type vacuum packaging machine in a laboratory with an atmospheric pressure of 1000 hPa, prepared photostimulable phosphor layer side sealing film, support side seal film, hygroscopic material, and photostimulable phosphor sheet In accordance with the flow shown in FIG. 4, the sealing body was manufactured by changing the internal pressure of the sealing body as shown in Table 1, and sample No. 101 and 102. In addition, as a comparative sample, a hygroscopic material is not used, and an air intake valve is not attached to the support side sealing film, and the sealing body is manufactured by changing the internal pressure of the sealing body as shown in Table 1, Sample No. 103-106. The sealing film was sealed with a heat sealer, and the four sides were bonded simultaneously by heat welding.

Evaluation Each sample No. After removing the nylon tape of the closing means closing the first intake port of the intake valve in a laboratory attached to 101 to 106, adjusted to a temperature of 30 ° C., a humidity of 80% RH, and an atmospheric pressure of 1000 hPa and 800 hPa, the sharpness ( Table 1 shows the results of the test conducted by the following method and evaluated according to the following evaluation rank.

Sharpness test method Sharpness (also called sharpness) was evaluated by irradiating a stimulable phosphor sheet with X-rays having a tube voltage of 80 kVp through an MTF chart made of lead, followed by panel He-Ne laser light ( 633 nm), and excited light emitted from the stimulable phosphor layer is received by the same light receiver and converted into an electrical signal, which is converted from analog to digital and recorded on a hard disk. The recording was analyzed by a computer to examine the modulation transfer function (MTF) of the X-ray image recorded on the hard disk. The modulation transfer function (MTF) is measured at 10 points on the surface of a 45 cm × 45 cm square photostimulable phosphor sheet, attached to each sample, and the distribution of MTF values in the surface of the photostimulable phosphor sheet. The average value of the deterioration of sharpness at 10 points from the start of aging was recorded for each sample.

  The sharpness is shown in Table 1 as a result of relative evaluation with the sharpness before sealing by the sealing film as 100. The closer the number is to 100, the smaller the sharpness degradation is, and the closer the number is to 1, the less the luminance degradation. In order to put it to practical use as a radiation image conversion panel, it is preferable that the reduction in sharpness due to sealing with a sealing film is within 3%.

Evaluation rank of sharpness ○: Sharpness reduction is less than 3% Δ: Sharpness reduction is 3% or more, less than 6% ×: Sharpness reduction is 6% or more

  Sample No. In 103 and 104, the sealing film was in close contact with the photostimulable phosphor layer, and the sharpness was lowered due to the close contact. Sample No. 105 was the same as the pressure in the laboratory that produced the sealed body and the pressure in the laboratory that used the sealed body. Sample No. In 106, the pressure in the laboratory at the time of use was lowered, so that wrinkles occurred, flatness could not be obtained, and sharpness and image performance were deteriorated. That is, the comparative sample No. prepared with an internal pressure suitable for use. In 105 and 106, it was confirmed that the case where it cannot respond to the environment at the time of use will occur. The effectiveness of the present invention was confirmed.

Example 2
Sample No. 1 prepared in Example 1 was used. Tests showing sharpness (also referred to as sharpness) and brightness when 101 to 106 were used for 2 years at a temperature of 30 ° C., a humidity of 80% RH, and a laboratory pressure of 1000 hPa under the same conditions as in Example 1. Table 2 shows the results of testing by the method and evaluating according to the following evaluation rank.

Sharpness test method and evaluation rank Example 1 coating The same method was applied.

Luminance test method The luminance was measured after irradiating X-rays having a tube voltage of 80 kVp from the support side of the stimulable phosphor sheet with respect to each of the prepared stimulable phosphor sheets (each sample No. 101 to 106). The stimulable phosphor sheet is excited by operating with a semiconductor laser beam (690 nm), and the photostimulated luminescence emitted from the phosphor layer is received by a light receiver (photoelectron image multiplier of spectral sensitivity S-5), The intensity was measured, this was defined as the brightness, and the brightness of the photostimulable phosphor sheet measured before sealing with the sealing film was set to 1 and displayed as a relative value.

Evaluation rank of luminance ○: Decrease in luminance is less than 5% Δ: Decrease in luminance is 5% or more and less than 8% ×: Decrease in luminance is 8% or more

  Sample No. In 103 and 104, the sealing film is in close contact with the photostimulable phosphor layer, so that the brightness and sharpness of the photostimulable phosphor layer are further reduced by the water vapor slightly transmitted through the sealing film. . Sample No. In 105 and 106, no change in brightness and sharpness was confirmed during the period of use, but from the same day results in Example 1, the use environment where the situation at the time of use could not be achieved was limited. It was confirmed that The effectiveness of the present invention was confirmed.

Example 3
<Production of photostimulable phosphor plate>
(Preparation of base material)
The same base material as Example 1 was prepared.

(Production of photostimulable phosphor sheet)
The same photostimulable phosphor sheet as in Example 1 was produced.

<Preparation of sealing film>
Two films having a multilayer structure of PET 12 μm / alumina-deposited PET 12 μm / CPP 30 μm, which were 20% larger than the size of the stimulable phosphor sheet, were prepared as the sealing film. As shown in Table 3, the sealing film on the support side of the photostimulable phosphor sheet is provided with an intake valve of the internal pressure adjusting means shown in FIG. 3-1 to 3-5. The first intake port of the intake valve was sealed using nylon tape as a closing means.

<Preparation of hygroscopic material>
A hygroscopic material in the form of a film sheet cut to the size of the substrate was prepared. The hygroscopic material used was a dry keep sheet manufactured by Sasaki Chemicals.

<Preparation of sealing body>
FIG. 4 shows the photostimulable phosphor layer side sealing film, the support side sealing film, the hygroscopic material, and the photostimulable phosphor sheet prepared using the vacuum chamber type vacuum packaging machine. According to the flow, the sealing body was manufactured by changing the internal pressure of the sealing body as shown in Table 1. 301 to 305.

Evaluation Each sample No. For 301 to 305, after removing the nylon tape of the closing means for closing the first intake port of the intake valve in a laboratory adjusted to a temperature of 30 ° C., a humidity of 80% RH, and an atmospheric pressure of 1000 hPa, it was used for 2 years. Sharpness of time (also called sharpness) was tested in the same manner as in Example 1, tested in the same evaluation rank as in Example 1, and luminance was tested in the same way as in Example 2, and according to the same evaluation rank as in Example 2. Table 4 shows the evaluation results.

  The effectiveness of the present invention was confirmed.

It is the schematic of the sealing body which sealed the photostimulable phosphor sheet with the sealing film. It is a schematic sectional drawing of the sealing body which has an internal pressure adjustment means. FIG. 3 is an enlarged schematic view of a portion indicated by S in FIG. 2. It is a schematic flowchart which shows until it manufactures the sealing body shown by FIG.

Explanation of symbols

1, 1a, 1b, 2 Sealed body 101a, 101b, 102a1, 203, 204 Sealing film 102a, 102b, 201 Stimulable phosphor sheet 102a1, 102b1, 201a Support body 102a2, 201b Intermediate layer 102a3, 102b3, 201c Stimulable phosphor layer 102a4, 102b3, 201d Protective layer 202 Internal pressure adjusting means 202a Main body 202b Mounting portion 202c First intake port 202d Second intake port 202e Coil spring 202f Sealing member 205 Gap portion 206 Hygroscopic material 207 Closing unit

Claims (10)

Covering the stimulable phosphor layer side and the support side of a stimulable phosphor sheet having a stimulable phosphor layer on a support with a sealing member, and sealing with the sealing member under reduced pressure conditions In the photostimulable phosphor sheet sealing body,
The photostimulable phosphor sheet sealing body has an internal pressure adjusting means for adjusting an internal pressure,
A photostimulable phosphor sheet encapsulant that is capable of adjusting an internal pressure during use by allowing the internal pressure adjusting means to supply air to the photostimulable phosphor sheet encapsulant during use. 2. The photostimulable phosphor sheet encapsulant according to claim 1, wherein an internal pressure during use of the photostimulable phosphor sheet encapsulant is −25 to −50 kPa which is an atmospheric pressure of a use environment. . The internal pressure adjusting means is an intake valve, and the valve operation is stopped by a closing means before use, and by releasing the closing means at the time of use, air can be supplied to the photostimulable phosphor sheet sealing body. In addition, when the internal pressure of the photostimulable phosphor sheet sealing body reaches a predetermined internal pressure, the intake valve is closed, and the internal pressure of the photostimulable phosphor sheet sealing body can be adjusted. The photostimulable phosphor sheet sealing body according to claim 1 or 2. The photostimulable phosphor sheet encapsulant according to any one of claims 1 to 3, wherein the photostimulable phosphor sheet encapsulant has a hygroscopic material disposed therein. 5. The sealing member according to claim 1, wherein the sealing member is a film material comprising at least one layer having a water vapor transmission rate of 0.5 g / m ² (24 h, 40 ° C., 90% RH) or less. The photostimulable phosphor sheet encapsulant described in the item. A photostimulable phosphor sheet sealed by covering and stimulating the stimulable phosphor layer side and the support side of a stimulable phosphor sheet having a stimulable phosphor layer on a support. In the method for producing a photostimulable phosphor sheet encapsulant for producing a body using a production apparatus having a stimulable phosphor sheet supply step, a sealing member supply step, and a sealing step,
The sealing member supplied in the sealing member supplying step is provided with an internal pressure adjusting means,
In the sealing step, the photostimulable phosphor sheet sealing body is sealed under reduced pressure to an internal pressure capable of supplying air to the photostimulable phosphor sheet sealing body during use by the internal pressure adjusting means. Method. The internal pressure of the photostimulable phosphor sheet sealing body sealed under reduced pressure in the sealing step is inhaled by the internal pressure adjusting means at the time of use, so that the internal pressure is −25 to −50 KPa, which is the atmospheric pressure of the use environment. The method for producing a photostimulable phosphor sheet encapsulant according to claim 6, which is obtained. The internal pressure adjusting means is an intake valve, and the operation of the valve is stopped by a closing means before use, and the air is supplied to the photostimulable phosphor sheet sealing body by releasing the closing means at the time of use. The intake valve is closed when the internal pressure to the photostimulable phosphor sheet sealing body reaches a predetermined internal pressure, and the internal pressure of the photostimulable phosphor sheet sealing body can be adjusted. The method for producing a photostimulable phosphor sheet encapsulant according to claim 6 or 7, characterized in that: The photostimulable phosphor sheet sealing body according to any one of claims 6 to 8, wherein the photostimulable phosphor sheet sealing body has a hygroscopic material inside. Method. The said sealing member is a film material which consists of at least 1 layer whose water-vapor-permeation rate is 0.5 g / m < ² > (24h, 40 degreeC, 90% RH) or less, The any one of Claims 6-9 characterized by the above-mentioned. A method for producing a photostimulable phosphor sheet encapsulant as described in the item.

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