JP2001083299A - Sealed phosphor plate and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sealed phosphor plate with a smaller region of image deficiency and a method for manufacturing the plate. SOLUTION: A stimulable phosphor plate 101 is formed in a film 111 folded in two is sealed by a folded and sealed structure where three sides other than a folded side are sealed. Consequently, the width of the sealed selvage of the folded side can be narrowed and a region of image deficiency can be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a sealed phosphor plate and a method for manufacturing the sealed phosphor plate.

[0002]

2. Description of the Related Art Radiation images such as X-ray images are widely used for diagnosis of diseases. In order to obtain this X-ray image, X-rays that have passed through the subject are irradiated on the phosphor layer (fluorescent screen), thereby generating visible light, and this visible light is converted into a silver salt in the same manner as when a normal photograph is taken. A so-called radiograph is used, which is developed by irradiating a film using a polymer. However, in recent years, a method has been devised for directly taking out an image from the phosphor layer without using a film coated with a silver salt.

In this method, radiation transmitted through a subject is absorbed by a phosphor, and then the phosphor is excited by, for example, light or heat energy, so that the radiation energy accumulated by the phosphor is absorbed by the phosphor. Then, there is a method of detecting and imaging this fluorescence.

[0004] As an alternative to conventional radiography,
For example, a radiation image recording / reproducing method using a stimulable phosphor as described in JP-A-55-12145 is known.

This method uses a stimulable phosphor plate (radiation image conversion panel) having a stimulable phosphor layer formed on a support.
The radiation transmitted through the subject or emitted from the subject is absorbed by the stimulable phosphor of the stimulable phosphor plate, and then the stimulable phosphor is converted into visible light,
The radiation energy accumulated in the stimulable phosphor is emitted as fluorescence (stimulated emission light) by exciting in time series with electromagnetic waves (excitation light) such as ultraviolet rays, and the fluorescence is read photoelectrically. An electric signal is obtained by the above-described method, and a radiation image of a subject or a subject is reproduced as a visible image based on the obtained electric signal.

The stimulable phosphor plate that has been read is prepared for the next photographing after the remaining image is erased. That is, the stimulable phosphor plate can be used repeatedly.

According to the above-mentioned radiographic image recording / reproducing method, a radiographic image which is much richer in information amount with a much smaller exposure dose than the conventional radiographic method using a combination of a radiographic film and an intensifying screen. There is an advantage that can be obtained.

Further, in the conventional radiographic method, a radiation film is consumed for each single photographing, whereas in this radiographic image conversion method, a stimulable phosphor plate can be used repeatedly, so that resource conservation and It is also advantageous in terms of economic efficiency. A stimulable phosphor is a phosphor that emits stimulable light when irradiated with radiation and then with excitation light.
300-500 by excitation light whose wavelength is in the range of 400-900nm
Phosphors that exhibit stimulated emission in the nm wavelength range are commonly used.

The stimulable phosphor plate used in the radiation image recording / reproducing method has, as a basic structure, a support and a stimulable phosphor layer provided on the surface thereof. However, when the phosphor layer is a self-supporting body, the supporting body is not necessarily required.

The stimulable phosphor layer usually comprises a stimulable phosphor and a binder containing and supporting the stimulable phosphor in a dispersed state. However,
As the stimulable phosphor layer, there is known a stimulable phosphor layer formed by a vapor deposition method or a sintering method, which does not include a binder and is composed only of an aggregate of the stimulable phosphor.

There is also known a stimulable phosphor plate having a stimulable phosphor in which a polymer substance is contained in a space between aggregates of the stimulable phosphor. In any of these phosphor layers, when the stimulable phosphor is irradiated with excitation light after absorbing radiation such as X-rays, it has a property of exhibiting stimulable light emission, so The radiation emitted from the subject is absorbed by the stimulable phosphor layer of the stimulable phosphor plate in proportion to the radiation dose, and the radiation image of the subject or the subject is stored on the plate in the form of a radiation energy image. Is formed as

The accumulated image can be emitted as stimulated emission light by irradiating the excitation light, and the stimulated emission light is photoelectrically read and converted into an electric signal to thereby accumulate radiation energy. Can be imaged.

The surface of the stimulable phosphor layer (the surface not facing the support) is usually provided with a protective layer made of a polymer film or an inorganic vapor-deposited film.
The phosphor layer is protected from chemical alteration or physical impact.

For the purpose of protecting the stimulable phosphor plate from deterioration particularly due to humidity, as shown in FIG. 10, the stimulable phosphor plate 1 is made of two highly moisture-proof films 3, 3 '. There is also known a sealed phosphor plate 4 having a structure in which the surroundings are sealed by heat sealing while being sandwiched and degassed.

Examples of the moisture-proof films 3, 3 'include polyvinylidene chloride films, various polyvinylidene chloride coated films, PTFE (polytetrafluoroethylene), and PCTFE.
(Polychlorotrifluoroethylene), PVDF (polyvinylidene fluoride), FEP (fluorinated ethylene-propylene copolymer), etc., various fluororesin-based films, silica-deposited (or coated) film, aluminum oxide-deposited (or coated) A low water vapor permeable film such as a film, or a composite material thereof is used. Further, in this case, the moisture-proof film 3,
For the purpose of imparting heat sealability to 3 ', it is preferable to use a composite structure in which a film having good heat sealability such as a polyolefin film is laminated on the inner layer.

In the case of the stimulable phosphor plate 1 in which the stimulable phosphor layer 8 is formed on a support (film) 9 having no rigidity, the stimulable phosphor plate 1 is used for the purpose of facilitating handling. Directly or in a state of being sealed with the above moisture-proof film, it may be used by being attached to a rigid flat plate 5 using an adhesive 7 as shown in FIGS. 11 (a) and 11 (b). .

The following are examples of stimulable phosphors conventionally used in stimulable phosphor plates. (1) described in JP-A-55-12145 (Ba _1-X , M
2 _X ) FX: yA (where M2 is at least one of Mg, Ca, Sr, Zn and Cd, X is at least one of Cl, Br and I, A is Eu, Tb, Ce, Tm , Dy, Pr, Ho, Nd, Yb and at least one of Er, and 0 ≦ x ≦ 0.6, 0 ≦ y0.2) a rare earth element-activated alkaline earth metal fluoride represented by a composition formula Halide phosphor.

The phosphor may contain the following additives. X ', BeX ", M3X"' ₃ described in JP-A-56-74175 (where X ', X ", X"' are each at least one of Cl, Br and I, M3 is a trivalent metal). BeO as described in JP 55-160078 discloses, MgO, CaO, SrO, BaO , ZnO, Al 2 O 3, Y 2 O 3, La 2 O 3, In
₂ O ₃ , SiO ₂ , TiO ₂ , Zr O ₂ , GeO ₂ , SnO ₂ , Nb ₂ O ₅ , Ta ₂ O ₅ and ThO
_2nd class metal oxide.

Z described in JP-A-56-116777
r, Sc. B described in JP-A-57-23673. As and Si described in JP-A-57-23675.

M described in JP-A-58-206678
L (where M is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs, L is Sc, Y, La, Ce,
At least one trivalent metal selected from the group consisting of Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga, In and Tl).

A calcined product of a tetrafluoroborate compound described in JP-A-59-27980. A calcined product of a salt of a monovalent or divalent metal of hexafluorosilicic acid, hexafluorotitanic acid and hexafluorozirconic acid described in JP-A-59-27289.

Na described in JP-A-59-56479
X '(where X' is at least one of Cl, Br and I). V, Cr, described in JP-A-59-56480
Transition metals such as Mn, Fe, Co and Ni.

M1 described in JP-A-59-75200
X ', M'2X ", M3X"', A (where M1 is Li, Na, K, Rb and Cs
M'2 is at least one divalent metal selected from the group consisting of Be and Mg, and M3 is selected from the group consisting of Al, Ga, In and Tl It is at least one kind of trivalent metal. A is a metal oxide, and X ′, X ″ and X ″ ″ are F, C
at least one halogen selected from the group consisting of l, Br and I).

M described in JP-A-6-23679
2′X ′ ₂・ M2′X ″ ₂ (where M2 ′ is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca, and X ′ and X ″ are Cl, Br and I, respectively. At least one halogen selected from the group consisting of
X ") and LnX" ₃ described in Japanese Patent Application No. 60-106752 (where Ln is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Gd, Tb,
(At least one rare earth element selected from the group consisting of Dy, Ho, Er, Tm, Yb, and Lu, and X ″ is at least one halogen selected from the group consisting of F, Cl, Br, and I). 2) M2X2 ・ aM described in JP-A-60-84381
2 ′ ₂ : xEu ²⁺ (where M2 is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca, and X and X ′ are at least one selected from the group consisting of Cl, Br and I Is a kind of halogen, and X ≠ X ′, and a is
0.1 ≦ a ≦ 0.2, where x is 0 <x ≦ 0.2) divalent europium-activated alkaline earth metal halide phosphor represented by the composition formula:

Further, the phosphor may contain the following additives. M1X "described in JP-A-60-166379 (where M1 is at least one alkali metal selected from the group consisting of Rb and Cs, and X"
Is at least one halogen selected from the group consisting of F, Cl, Br and I).

K described in JP-A-60-221483
X ″, MgX ″ ′ ₂ , M3X ″ ″ ₃ (where M3 is Sc, Y, La, Gd and I
X ″, X ″ ″ and X ″ ″ are at least one halogen selected from the group consisting of F, Cl, Br and I).

It is described in JP-A-60-228592.
B. SiO ₂ that is described in JP 60-228593 JP, P ₂ O ₅
Oxides. L described in JP-A-61-120882
iX, NaX ″ (where X, X ″ is at least one halogen selected from the group consisting of F, Cl, Br and I).

S described in JP-A-61-120883
iO. JP 61-120885 Patent SnX disclosed in Japanese _'2 (where, X' is at least one halogen selected from the group consisting of F, Cl, Br and I).

C described in JP-A-61-235486
sX ″, SnX ′ ″ ₂ (where X ″ and X ′ ″ are F, Cl, B
r, at least one halogen selected from the group consisting of I) CsX ″, Ln ³⁺ described in JP-A-61-235487 (where X ″ is composed of F, Cl, Br and I) At least one halogen selected from the group, Ln is Sc, Y, Ce, Pr, Nd, Sm, G
d, Tb, Dy, Ho, Er, Tm, Yb, and at least one rare earth element selected from the group consisting of Lu). (3) LnOX: xA described in JP-A-55-12144 (where Ln is at least one of La, Y, Gd and Lu, X is C
a rare earth element-activated oxyhalide phosphor represented by a composition formula of at least one of l, Br and I, A is at least one of Ce and Tb, and x is 0 <x <0.1). (4) M3OX: xCe described in JP-A-58-69281
(However, M3 is Pr, Nd, Pm, Sm, Eu, Yb, Dy, Ho, Er, Tm, Yb and B
i is at least one metal oxide selected from the group consisting of i, X is at least one of Cl, Br and I, x
Is a cerium-activated trivalent metal oxyhalide phosphor represented by a composition formula of 0 <x <0.1). (5) M1X: xBi described in Japanese Patent Application No. 60-70484
(However, M1 is at least one alkali metal selected from the group consisting of Rb and Cs, X is at least one halogen selected from the group consisting of Cl, Br and I,
x is a bismuth-activated alkali metal halide phosphor represented by a composition formula of 0 <x ≦ 0.2). (6) M2 ₅ (PO ₄ ) 3 described in JP-A-60-141783
x: xEu ²⁺ (where M2 is at least one kind of alkaline earth metal selected from the group consisting of Ca, Sr and Ba, and X is F, C
A divalent europium-activated alkaline earth metal halophosphate phosphor represented by a composition formula of 0 <x ≦ 0.2), which is at least one halogen selected from the group consisting of l, Br and I. (7) M2BO ₃ X: xE described in JP-A-60-157099
u ²⁺ (where M2 is at least one kind of alkaline earth metal selected from the group consisting of Ca, Sr and Ba, and x is 0 <x ≦
A divalent europium-activated alkaline earth metal haloborate phosphor represented by a composition formula of 0.2). (8) M2 ₂ PO ₄ X: x described in JP-A-60-157100
Eu ²⁺ (where M2 is at least one kind of alkaline earth metal selected from the group consisting of Ca, Sr and Ba, X is at least one kind of halogen selected from the group consisting of Cl, Br and I, x Is a divalent europium-activated alkaline earth metal halophosphate phosphor represented by a composition formula of 0 <x ≦ 0.2). (9) M2HX: xEu described in JP-A-60-217354
²⁺ (where M2 is a kind of alkaline earth metal selected from the group consisting of Ca, Sr and Ba, X is at least one kind of halogen selected from the group consisting of Cl, Br and I, x
Is a divalent europium-activated alkaline earth metal hydride halide phosphor represented by a composition formula of 0 <x ≦ 0.2). (10) JP is described in 61-21173 JP LnX ₃ · aL
n ′ ₃ : xCe ³⁺ (where Ln and Ln ′ are each at least one rare earth element selected from the group consisting of Y, La, Gd and Lu, and X is a group consisting of F, Cl, Br and I At least one selected halogen, a is 0 <a ≦ 10.0, x is
A cerium-activated rare earth composite halide phosphor represented by a composition formula of 0 <x ≦ 0.2). (11) LnX as described in JP 61-21182 discloses ₃ · AM1
X ′: xCe ³⁺ (where Ln and Ln ′ are each at least one rare earth element selected from the group consisting of Y, La, Gd and Lu, and M1 is a group consisting of Li, Na, K, Cs and Rb At least one alkali metal selected from the group consisting of X and X ′
Is at least one halogen selected from the group consisting of Cl, Br and I, a is 0 <a ≦ 10.0, x is 0 <x ≦
A cerium-activated rare earth composite halide phosphor represented by the composition formula 0.2). (12) JP is described in 61-40390 JP LnPO ₄ · aL
nX ₃ : Ce ³⁺ (where Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu, and X is F, Cl, Br
A cerium-activated rare earth halophosphate phosphor represented by a composition formula wherein a is 0.1 ≦ a ≦ 10.0 and x is 0 <x ≦ 0.2).

Among the stimulable phosphors, a divalent europium-activated alkaline earth metal halide-based phosphor containing iodine, a rare earth element-activated rare earth oxyhalide-based phosphor containing iodine, and iodine Bismuth-activated alkali metal halide-based phosphors containing chromium exhibit high luminance stimulable fluorescence. Examples of the support used for the stimulable phosphor plate include various polymer materials, glass, and metal.

In particular, a material which can be processed into a flexible sheet or web for handling as an information recording material is preferable. In this regard, cellulose acetate film, polyester film, polyethylene terephthalate film, polyethylene naphthalate film are preferred. , Polyamide film, polyimide film, triacetate film, plastic film such as polycarbonate film, metal sheet such as aluminum, iron, copper, chromium, etc.
Alternatively, a metal sheet having a coating layer of these metal oxides and metal sulfides is preferable.

The layer thickness of the support varies depending on the material used, but is generally 3 to 1000 μm, and preferably 80 to 500 μm from the viewpoint of handling. The surface of the support may be a smooth surface or a mat surface for the purpose of improving the adhesion to the stimulable phosphor layer.

Further, these supports may be provided with an undercoat layer on the surface on which the stimulable phosphor layer is provided, for the purpose of improving the adhesion to the stimulable phosphor layer. Examples of the binder used in the stimulable phosphor layer include proteins such as gelatin, polysaccharides such as dextran, and natural polymer substances such as gum arabic, and polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethyl cellulose, and chloride. Binders represented by synthetic polymers such as vinylidene, vinyl chloride copolymer, polyacryl (meth) acrylate, vinyl chloride / vinyl acetate copolymer, polyurethane, cellulose acetate butyrate, polyvinyl alcohol, linear polyester, etc. it can.

Particularly preferred such binders are:
Nitrocellulose, linear polyester, polyacryl (meth) acrylate, a mixture of linear polyester and nitrocellulose, a mixture of nitrocellulose and polyacryl (meth) acrylate, and a mixture of polyurethane and polyvinyl butyral.

These binders may be cross-linked by a cross-linking agent. Generally, the binder is used in an amount of 0.01 to 1 part by weight based on 1 part by weight of the stimulable phosphor.

However, from the standpoint of sensitivity and sharpness of the resulting stimulable phosphor plate, it is preferable that the amount of the binder is small, and the range is 0.03 to 0.2 part by weight in view of the balance with ease of application.

Examples of the solvent used for preparing the coating solution for the stimulable phosphor layer include lower alcohols such as methanol, ethanol, isopropanol and n-butanol, acetone, and the like.
Ketones such as methyl ethyl ketone, methyl isobutyl ketone and cyclohexane; esters of lower fatty acids such as methyl acetate, ethyl acetate and n-butyl acetate with lower alcohols; dioxane; ethers such as ethylene glycol monoethyl ether and ethylene glycol monomethyl ether; and triols And halogenated hydrocarbons such as methylene chloride, and mixtures thereof.

The coating solution contains a dispersant for improving the dispersibility of the phosphor in the coating solution, and a binding force between the binder and the phosphor in the stimulable phosphor layer after formation. Various additives such as a plasticizer for improving may be mixed.

Examples of dispersants used for such purposes include lipophilic surfactants such as phthalic acid, stearic acid and caproic acid. Examples of the plasticizer include phosphoric esters such as triphenyl phosphate, tricresyl phosphate, and diphenyl phosphate; phthalic esters such as diethyl phthalate and dimethoxyethyl phthalate; glycolic esters such as phthalyl butyl glycolate; and triethylene glycol and adipine Examples thereof include polyesters with an acid, and polyesters with a polyethylene glycol and a fatty acid-base such as a polyester with diethylene glycol and succinic acid.

The preparation of the coating solution for the stimulable phosphor layer is carried out using a dispersing device such as a ball mill, a sand mill, an attritor, a three-roll mill, a high-speed impeller disperser, a Kady mill and an ultrasonic disperser.

The coating solution prepared as described above is then uniformly applied to the surface of the support or the surface of the undercoat layer to form a coating film of the coating solution. This coating operation can be performed by using a usual coating means, for example, a doctor blade, a roll coater, a knife coater or the like.

Next, the formed coating film is dried by gradually heating to complete the formation of the stimulable phosphor layer on the surface of the support or on the undercoat layer. It is also possible to use a method in which a coating solution is applied on the protective layer, dried, and then the stimulable phosphor layer and the support are adhered to each other.

The thickness of the stimulable phosphor layer of the stimulable phosphor plate depends on the characteristics of the target stimulable phosphor plate, the type of the stimulable phosphor, and the difference between the binder and the stimulable phosphor. Although it depends on the mixing ratio and the like, it is preferably selected from the range of 10 μm to 1000 μm, more preferably from the range of 10 to 500 μm.

[0044]

When a sealed phosphor plate is used for mammography (mammography),
The breast image on the chest wall side must have as few image-defective areas as possible, so even in the sealed phosphor plate, the image-defective area on the chest wall side (the area where the photostimulable phosphor layer is not provided) Needs to be set as narrow as possible.

Regardless of mammography, it is desirable that the image defect area is as small as possible from the viewpoint of securing a large image area. However, in particular, as shown in FIG. 10, when the stimulable phosphor plate 1 is sealed with the moisture-proof films 3, 3 ', the width L1 required for sealing the films 3, 3' and the stimulable A width L including a width L2 generated by the thickness of the phosphor plate 1 is required, and this becomes an image-deficient area.

In the case of the sealing phosphor plate 4 having a structure attached to the flat plate 5 as shown in FIGS. 11 (a) and 11 (b),
Since the sealing phosphor plate 4 must be located within the flat plate 5 (not to protrude from the flat plate 5), considering an error in sticking, the distance between the edge of the flat plate and the edge of the stimulable phosphor plate is considered. The width L 'becomes larger
(See FIG. 11 (c)).

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a sealed phosphor plate having a reduced image defect area and a method of manufacturing the same.

[0048]

According to a first aspect of the present invention, there is provided a folded film in which a stimulable phosphor plate is provided in a folded film and three sides other than the folded side are sealed. It is a sealed phosphor plate sealed by a sealing structure.

The stimulable phosphor plate is provided in the folded film, and is sealed by a folded sealing structure in which three sides other than the folded side are sealed.
It is possible to reduce the width of the sealing edge at the folded side, and to reduce the image defect area.

Here, the film is desirably a moisture-proof film having a layer thickness of 200 μm or less, as in the invention according to claim 2, from the viewpoint of reducing the width of the folded edge.
Further, as in the third aspect of the present invention, it is desirable that the layer thickness of the film is 100 μm or less.

According to a fourth aspect of the present invention, a stimulable phosphor plate is provided in a folded film, and three sides other than the folded side are sealed by a folded sealing structure. A sealed phosphor plate, wherein the folded sides are heat-sealed.

By heat sealing the folded side of the film, the gap at the folded side can be reduced. Further, when an inorganic vapor-deposited film such as aluminum oxide vapor-deposited polyethylene terephthalate film is used as the film, the folded-back portion can be reduced. In the case of using an inorganic vapor-deposited layer or a highly moisture-proof polymer film, a small crack is generated in the folded portion of the polymer film itself by folding, but a minute crack is formed by heat sealing the folded portion. The crack is melt-sealed to prevent the invasion of water vapor.

According to a fifth aspect of the present invention, in the heat seal of the fourth aspect, heat is applied from a surface of the stimulable phosphor plate opposite to a surface of the stimulable phosphor layer. It is a sealed phosphor plate characterized by the following.

The heat seal can prevent heat from propagating to the stimulable phosphor layer by applying heat from the side opposite to the stimulable phosphor layer. As the stimulable phosphor plate of such an embodiment, there is a stimulable phosphor plate for mammography imaging as in the invention of claim 6.

According to a seventh aspect of the present invention, there is provided a sealed phosphor plate having a stimulable phosphor plate sealed with a film adhered to a flat plate, wherein the flat plate has a warpage of 2.0 mm.
A sealed phosphor plate characterized by the following.

By setting the warpage of the flat plate to 2.0 mm or less, sensitivity unevenness is reduced. As the stimulable phosphor plate of such an embodiment,
There is a stimulable phosphor plate for mammography photography.

According to a ninth aspect of the present invention, there is provided a sealed phosphor plate having a stimulable phosphor plate sealed with a film adhered to a flat plate, wherein the stimulable phosphor plate is folded in two. Provided in a film, and sealed by a folded sealing structure in which three sides other than the folded sides are sealed, and the folded sides of the film are adhered along the vicinity of one side of the flat plate in the flat plate. Is a sealed phosphor plate.

The stimulable phosphor plate is provided in a folded film, and is sealed by a folded sealing structure in which three sides other than the folded side are sealed.
It is possible to reduce the width of the sealing edge at the folded side, and to reduce the image defect area.

Further, since the folded side of the film is adhered along the vicinity of one side of the flat plate in the flat plate,
The image defect area can be made smaller. Claim 1
The invention according to claim 0 is the sealed phosphor plate according to claim 9, wherein the flat plate has a warpage of 2.0 mm or less.

By setting the warpage of the flat plate to 2.0 mm or less, sensitivity unevenness is reduced. The invention according to claim 11 is
The sealing phosphor plate according to claim 9 or 10, wherein a distance between an edge of the stimulable phosphor plate on the folded side of the film and one side of the flat plate is 1.0 mm or less. . The distance between the edge of the stimulable phosphor plate on the folded side of the film and one side of the flat plate is 1.0 m.
By setting it to m or less, it can be used for photographing that requires a small image defect width.

As the stimulable phosphor plate of such an embodiment, there is a stimulable phosphor plate for mammography photography as described in the twelfth aspect. According to a thirteenth aspect of the present invention, the transparent film is folded in two, two sides orthogonal to the folded side are sealed to form a bag-like film having an opening, and a stimulable phosphor plate is inserted from the opening of the bag-like film. Then, the stimulable phosphor plate is brought into contact with the folded side of the bag-shaped film, and depressurized while pressing the stimulable phosphor plate with the plate to seal one side facing the folded side. A method for manufacturing a sealed phosphor plate.

The stimulable phosphor plate is provided in the folded film, and is sealed by a folded sealing structure in which three sides other than the folded side are sealed.
It is possible to reduce the width of the sealing edge at the folded side, and to reduce the image defect area.

Further, when degassing and sealing one side opposite to the folded side, the stimulable phosphor plate pressed against the folded side is moved by pressing the stimulable phosphor plate with a plate. Can be prevented.

According to a fourteenth aspect of the present invention, there is provided a method of manufacturing a sealed phosphor plate according to the thirteenth aspect, wherein the plate is transparent. By making the plate transparent, even when the plate is pressed down, minute movements of the stimulable phosphor plate can be easily visually recognized.

According to a fifteenth aspect of the present invention, the stimulable phosphor plate is pressed by the plate while confirming the position of the stimulable phosphor plate in the bag-like film of the fourteenth aspect. A method for producing a sealed phosphor plate.

By pressing the stimulable phosphor plate with the plate while confirming the position of the stimulable phosphor plate in the bag-like film, the stimulable phosphor plate is sealed without displacement. it can.

According to a sixteenth aspect of the present invention, the transparent film is folded in two, and two sides orthogonal to the folded side are sealed to form a bag-like film having an opening. A method of manufacturing a sealed phosphor plate, comprising inserting a plate, sealing one side facing the folded side, and heat sealing the folded side of the film.

By sealing one side facing the folded side and heat-sealing the folded side of the film, the gap at the folded side can be reduced, and the film can be made of an inorganic material such as an aluminum oxide-deposited polyethylene terephthalate film. In the case of using a vapor-deposited film, the inorganic vapor-deposited layer in the folded portion, or, in the case of using a highly moisture-proof polymer film, the polymer film itself in the folded portion itself causes a small crack by folding, By heat sealing the folded portion, the minute crack portion is melt-sealed, and the invasion of water vapor can be prevented.

According to a seventeenth aspect of the present invention, in the heat seal of the sixteenth aspect, heat is applied from a surface of the stimulable phosphor plate opposite to a surface of the stimulable phosphor layer. This is a method for manufacturing a sealed phosphor plate.

The heat seal can prevent heat from propagating to the stimulable phosphor layer by applying heat from the side opposite to the stimulable phosphor layer. According to an eighteenth aspect of the present invention, there is provided a method of manufacturing a sealed phosphor plate, comprising pressing the stimulable phosphor layer of the stimulable phosphor plate from the stimulable phosphor layer side using an elastic member. Is the way.

By pressing the stimulable phosphor plate from the stimulable phosphor layer side using an elastic member, a uniform heat seal can be obtained. In the invention according to claim 19, the transparent film is folded in two, two sides orthogonal to the folded side are sealed to form a bag-like film having an opening, and a stimulable phosphor plate is inserted from the opening of the bag-like film. Then, the stimulable phosphor plate is pressed against the folded side of the bag-shaped film, and while the stimulable phosphor plate is pressed with the plate, degassing is performed, and one side facing the folded side is sealed, A method of manufacturing a sealed phosphor plate, characterized in that the plate is attached to a flat plate with the folded side as a position reference.

By sealing one side opposite to the folded side and pasting it to a flat plate with the folded side as a position reference, the attaching position can have various tolerances (tolerances for trimming width trimming, stimulable phosphor plate trimming tolerance). ).

According to a twentieth aspect of the present invention, there is provided a method for manufacturing a sealed phosphor plate, wherein the sealed phosphor plate attached to a flat plate is sequentially pressed from the aligned side.

By sequentially compressing from the aligned side, the stimulable phosphor plate or the flat plate at the time of the compression is less affected by the expansion and contraction of the sticking position. As the stimulable phosphor plate of such an embodiment, there is a stimulable phosphor plate for mammography imaging as in the invention of claim 21.

[0075]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a cross-sectional view of a sealed phosphor plate according to an embodiment of the present invention, and FIG. 2 for explaining attachment of the sealed phosphor plate shown in FIG. 1 to a flat plate.
This will be described with reference to FIG.

As shown in FIG. 1, the stimulable phosphor plate 101 includes a support 103 and a stimulable phosphor layer 105 applied on the support 103. The stimulable phosphor plate 101 is a sealed phosphor plate 113 sealed with a moisture-proof film 111.

In the present embodiment, as shown in FIGS. 1 and 2, a stimulable phosphor plate 101 is provided in a folded film 111, and three sides 111b, 111c, 111d other than the folded side 111a are provided. Are sealed by the sealed sealing structure.

Then, as shown in FIG. 2, the sealing phosphor plate 113 is
And the flat plate 121 such that one side of the flat plate
It is affixed on the upper side using a double-sided tape 123.

According to the above configuration, the following effects can be obtained. (1) The stimulable phosphor plate 101 is provided in the folded film 111, and is sealed by a folded sealing structure in which three sides other than the folded side 111a are sealed, thereby sealing the folded side 111a. The stop width L (see FIG. 1) can be reduced, and the image defect area can be reduced. (2) The folded side 111a of the film 111 is
By being attached along the vicinity of one side of the flat plate 121 within 1, the image defect area (L ', see FIG. 1) can be reduced.

[0080]

EXAMPLES (Production method) First, in order to synthesize a stimulable phosphor precursor of europium-activated barium fluoroiodide, Ba was prepared.
2500 ml of an aqueous solution of I ₂ (4.0 mol / l) and 125 ml of an aqueous solution of EuBr ₃ (0.2 N) were placed in a reactor. The reaction mother liquor in the reactor was kept at 70 ° C. while stirring.

An aqueous solution of ammonium fluoride (8N) (250 ml) was injected into the reaction mother liquor using a roller pump to form a precipitate. After completion of the pouring, the precipitate was aged by keeping the temperature and stirring for 2 hours.

Next, the precipitate was separated by filtration, washed with ethanol, and dried in vacuo to obtain europium-activated barium fluoroiodide crystals. 0.1% by weight of ultrafine alumina powder is added to prevent the change of particle shape due to sintering during firing and the change of particle size distribution due to fusion between particles, and sufficiently agitate with a mixer to add alumina to the crystal surface. Ultrafine powder was uniformly adhered.

This was filled in a quartz board and fired at 850 ° C. for 2 hours in a hydrogen gas atmosphere using a tube furnace to obtain europium-activated barium fluoroiodide phosphor particles. next,
By classifying the phosphor particles, particles having an average particle size of 3 μm were obtained.

As a stimulable phosphor-forming material, 427 g of the europium-activated barium fluoroiodide phosphor obtained above, 18 g of a polyester resin (Toyobo Byron 200), and Cu-phthalocyanine
0.01 g was added to a mixed solvent of methyl ethyl ketone and toluene (1: 1), dispersed by a propeller mixer, and had a viscosity of 25 to
A 30ps coating solution was prepared. This coating solution was applied on a black polyethylene terephthalate film having a thickness of 188 μm using a doctor blade and then dried at 100 ° C. for 15 minutes.
A stimulable phosphor layer having a thickness of 200 μm was formed.

In this embodiment, as shown in FIG. 1, a stimulable phosphor plate 101 having a 200 μm stimulable phosphor layer 105 coated on a 188 μm black polyethylene terephthalate film support 103 is provided. Then, the sealing phosphor plate 113 was formed using the film 111.

In this embodiment, as shown in FIG. 5, the film 111 is composed of an aluminum oxide-deposited polyethylene terephthalate film (12 μm) 111a, an aluminum oxide-deposited polyethylene terephthalate film (12 μm) 111b, and a polyethylene terephthalate film (12 μm) 111c.
And a non-stretched polypropylene film (30 μm) 111d having heat sealing properties, a four-layer moisture-proof film was used. Each layer was laminated by a gravure lamination method.

Next, FIG. 2 and the sealing phosphor plate 113
3 and 4 showing the manufacturing method of the method will be described. One sheet of the moisture-proof film 111 is folded, and the folded side 111a is creased with a finger. The sides 111c and 111d orthogonal to the folded side 111a of the film 111 are heat-sealed using an impulse sealer to form a bag-shaped film (three-sided bag) having an opening. The cut stimulable phosphor plate 101 is inserted from the opening of the bag-like film (FIG. 3A), and the folded side 111a is inserted.
Press the stimulable phosphor plate 101 on the substrate (FIG. 3 (b)
). Stimulable phosphor plate 1 including folded side 111a
A heavy transparent plate (glass plate having a thickness of 7.5 mm) is placed on the portion 01, and the stimulable phosphor plate 101
After confirming that it has not moved in the direction away from “a”, the opening is sealed while evacuating in the vacuum chamber (FIG. 3 (c)). Then, heat sealing is performed again on the four sides 111a to 111d including the folded side 111a in the vicinity of the stimulable phosphor plate 101. As shown in FIG. 4A, the heat sealer 151 for performing the heat sealing is provided with a heater 155 on the base 153 side, and the pressing member 157 for pressing the member to be sealed is made of soft rubber. Therefore, the sealing phosphor plate 113 is
Heat is applied from the opposite side of the stimulable phosphor layer 105, that is, from the support 103 side, it is heated by the heater 155.

Further, the sealing phosphor plate 113 is installed such that the edge of the heater 155 is positioned 1.0 mm inward into the stimulable phosphor plate 101 (FIG. 4A). .

The holding member 157 is sealed with the phosphor plate 1.
13 and heat sealing is performed (FIG. 4B). Three sides 111b, 111c other than the folded side 111a,
111d is from the edge of the stimulable phosphor plate 101
The margin of the film 111 is cut at a position of 2.9 mm. Using a double-sided tape 123 having a matrix (irregularity) structure, the sealing phosphor plate 113 is attached to a flat plate 121 on which carbon fibers having a thickness of 1.5 mm are laminated. At this time, the folded side 111a of the film 111 is attached along the vicinity of one side of the flat plate 121 (in the case of mammography, the side in contact with the chest wall of the subject) in the flat plate 121. A flat plate 1 is placed between a pair of nip rollers having a nip pressure of 2.0 kg / cm ² and a shore hardness of 30 ° with the folded side 111a side at the top.
Through the sealing phosphor plate 113 affixed to 21, pressure bonding is sequentially performed from the folded side 111 a side. Here, the device and the double-sided tape 123 used in will be described with reference to FIGS.

In FIG. 6, reference numeral 10 denotes a first base on which the sealing phosphor plate 113 having no rigidity is mounted. The folded surface 111a of the sealed phosphor plate 113 to be mounted abuts on the mounting surface of the sealed phosphor plate 113 of the first base 10, and a projection for positioning the sealed phosphor plate 113 is provided. A contact portion 14 is provided.

Further, the first base is provided with a plane holding means 16 for holding the plane of the sealing phosphor plate 113. The plane holding means 16 is provided on the first base 10.
And a suction pump 20 connected to these small holes 18 at substantially the same density on the mounting surface 10a of the sealed phosphor plate 113.

Reference numeral 30 is disposed at a position parallel to the first base 10, and the sealing phosphor plate 113 of the first base 10 is provided.
Is a second base on which the flat plate 121 is mounted on the surface 30a facing the mounting surface 10a.

The flat plate mounting surface 30a of the second base 30
Is provided with a butting portion 34 for positioning the flat plate 121 to be placed. In the apparatus of this embodiment, the flat plate 1
21, the folded side 111a of the sealing phosphor plate 113 with respect to one side (the side of the chest wall in the case of mammography).
In such a way that the positional relationship is very tight, that is, the film 1
The abutting portion 14 of the first base 10 and the abutting portion 34 of the second base 30 are provided such that the folded side 111a of the eleventh and one side of the flat plate 121 substantially match.

On the sealing phosphor plate mounting surface 10a of the first base 10, a guide rod 40 extending in a direction perpendicular to the mounting surface 10a is erected. On the other hand, the second base 30 is provided with a hole 36 into which the guide bar 40 is loosely fitted, and the second base 30 is guided by the guide bar 40 and is kept parallel to the first base 10. Approach with
/ Can be separated.

Further, the intermediate portion is wound around the guide rod 40,
The second base 30 is urged in a direction away from the first base by the urging force of a spring 42 whose one end is engaged with the first base 10 and the other end is engaged with the second base 30. In the natural state of the spring 42, the second base 30 is located at a distance from the first base 10.

A method of attaching the sealing phosphor plate 113 to the flat plate 121 using the phosphor plate attaching apparatus having the above-described configuration will be described. (1) The sealing phosphor plate 113 is abutted against the abutting portion 14 of the first base 10 to perform positioning, and the sealing phosphor plate 113 is mounted on the mounting surface 10a of the first base.

(2) The flat plate 121 is abutted against the abutting portion 34 of the second base 30 to perform positioning, and the flat plate 121 is mounted on the mounting surface 30 a of the second base 30. (3) The opposing surface 113a of the flat plate 121 mounted on the second base 30 of the sealed phosphor plate 113 mounted on the first base 10, the flat plate 12 mounted on the second base 30
A double-sided tape 123 is attached to at least one of the opposing surfaces 121 a of the sealing phosphor plate 113 placed on the first base 10, in this embodiment, the flat plate 121. Note that an adhesive may be used instead of the double-sided tape 123.

As shown in FIG. 7A, the double-sided tape 123 used in this embodiment is composed of a base material 123a and adhesive layers 123b and 123c formed on both sides of the base material 123a.

Further, the adhesive layers 123b and 123c are formed as shown in FIG.
As shown in (b), the prismatic convex portions 123d are regularly formed, forming an adhesive layer having a height difference. (4) The second base 30 is moved downward against the urging force of the spring 42, and the sealed phosphor plate 113 and the flat plate 1 are moved.
21 is pasted.

According to the above manufacturing method, the following effects can be obtained. (1) When using an inorganic vapor-deposited film such as an aluminum oxide-deposited polyethylene terephthalate film as the film, for the inorganic vapor-deposited layer at the folded portion, or when using a highly moisture-proof polymer film, the polymer at the folded portion is used. Although the film itself is folded to cause a minute crack, the heat-sealing of the folded portion melts and seals the minute crack to prevent the invasion of water vapor. (2) The heat seal can prevent heat from being propagated to the stimulable phosphor layer 105 by applying heat from the surface opposite to the stimulable phosphor layer 105. (3) One side 111 that is degassed and faces the folded side 111a
By pressing the stimulable phosphor plate 101 with a plate when sealing b, it is possible to prevent the stimulable phosphor plate 101 abutted against the folded side 111a from moving. (4) When the board is pressed down by making the board transparent,
Even minute movement of the stimulable phosphor plate 101 can be easily recognized. (5) The flat plate 121 is set using the folded side 111a as a position reference.
By sticking to the surface, the sticking position is less affected by various tolerances (tolerances for cutting the width of the trimming width, tolerances for cutting the stimulable phosphor plate). (6) By crimping sequentially from the folded side 111a,
It becomes less affected by the expansion and contraction of the sealing phosphor plate and the flat plate at the time of press bonding to the attaching position.

The present inventor conducted the following experiment in order to confirm the effects of the present invention. (First experiment) Using a stimulable phosphor plate 101 in which a 200 μm-thick stimulable phosphor layer was coated on a black polyethylene terephthalate film support having a thickness of 188 μm, , The sealing width L (see FIG. 1), and the distance from the edge of the flat plate 121 after being attached to the flat plate 121 to the edge of the stimulable phosphor plate 101 (image defect width).
The relationship with L '(see FIG. 1) was examined, and the results are shown in FIG.

When the sealed phosphor plate of the present invention is used for mammography imaging, the image defect width L 'needs to be 1.0 mm or less in the standard of imaging, and when various tolerances are taken into consideration, 0.7 mm is required. Since the thickness is preferably not more than mm, it has been confirmed that the desired thickness of the film 111 is not more than 200 μm, preferably not more than 100 μm. (Second Experiment) The relationship between the amount of warpage of the plate after the sealing phosphor plate 113 was attached to the flat plate 121 and the sensitivity unevenness index was examined, and the results are shown in FIG.

The method for evaluating sensitivity unevenness will be described below. After irradiating the entire surface of the stimulable phosphor layer 105 of the stimulable phosphor plate 101 with X-rays and scanning with a laser beam having a wavelength of 690 nm, light emission is read. The light emission signal is AD-converted, and light emission unevenness of the stimulable phosphor layer is evaluated as sensitivity unevenness.

Regarding the uneven emission, a signal difference of 1 to 99% of the signal intensity distribution on the stimulable phosphor layer surface was relatively evaluated. When the signal difference is large, the sensitivity distribution is large and the sensitivity unevenness is large.

When the sensitivity unevenness index is 20 or less, it is a practically acceptable level in visual evaluation of a radiation image. The warpage of the plate includes unevenness as a large undulation over the entire plate and local unevenness, and the height difference from the largest concave portion to the largest convex portion was defined as the amount of warpage.

Therefore, it was confirmed that if the amount of warpage was not less than 2.0 mm, it could not be practically used due to sensitivity unevenness.

[0107]

As described above, according to the first to third aspects of the present invention, the stimulable phosphor plate is provided in the folded film, and three sides other than the folded side are sealed. By being sealed by the folded sealing structure, the width of the sealing edge at the folded side can be reduced, and the image defect area can be reduced.

According to the fourth aspect of the present invention, the gap at the folded side can be reduced. Further, when an inorganic vapor-deposited film such as an aluminum oxide vapor-deposited polyethylene terephthalate film is used as the film, the inorganic material at the folded portion can be reduced. In the case of using a polymer film having a high moisture-proof property for the vapor-deposited layer, a small crack is generated by folding the polymer film itself in the folded portion,
By heat sealing the folded portion, the minute crack portion is melt-sealed, and the invasion of water vapor can be prevented.

According to the fifth aspect of the present invention, the heat seal can prevent heat propagation to the stimulable phosphor layer by applying heat from the surface opposite to the stimulable phosphor layer. .
According to the seventh aspect of the present invention, the unevenness in sensitivity is reduced by setting the warpage of the flat plate to 2.0 mm or less.

According to the ninth aspect of the present invention, the stimulable phosphor plate is provided in the folded film, and is sealed by the folded sealing structure in which three sides other than the folded side are sealed. Thereby, the width of the sealing edge at the folded side can be reduced, and the image defect area can be reduced.

Further, the folded side of the film is attached along the vicinity of one side of the flat plate in the flat plate,
The image defect area can be made smaller. Claim 1
According to the invention described in No. 0, sensitivity unevenness is reduced by setting the warpage of the flat plate to 2.0 mm or less.

According to the eleventh aspect of the present invention, by setting the distance between the edge of the stimulable phosphor plate on the folded side of the film and one side of the flat plate to be 1.0 mm or less, the image defect width can be reduced. Can be used for photographing where is required.

According to the thirteenth aspect of the present invention, the stimulable phosphor plate is provided in the folded film, and is sealed by the folded sealing structure in which three sides other than the folded side are sealed. Thereby, the width of the sealing edge at the folded side can be reduced, and the image defect area can be reduced.

When degassing and sealing one side opposite to the folded side, the stimulable phosphor plate pressed against the plate causes the stimulable phosphor plate to move against the folded side. Can be prevented.

According to the fourteenth aspect, by making the plate transparent, even when the plate is pressed down, minute movement of the stimulable phosphor plate can be easily visually recognized. Claim 15
According to the invention described above, by pressing the stimulable phosphor plate with the plate while confirming the position of the stimulable phosphor plate in the bag-shaped film, the stimulable phosphor plate is positioned. It can be sealed without slippage.

According to the sixteenth aspect of the present invention, one side opposite to the folded side is sealed and the folded side of the film is heat-sealed, so that the gap at the folded side can be reduced. In the case of using an inorganic vapor-deposited film such as an aluminum oxide-deposited polyethylene terephthalate film, for the inorganic vapor-deposited layer in the folded portion, or in the case of using a highly moisture-proof polymer film, in the folded-portion polymer film itself, Although a small crack is generated by folding, the small crack is melt-sealed by heat sealing the folded portion, so that penetration of water vapor can be prevented.

According to the seventeenth aspect of the present invention, the heat seal can prevent heat from propagating to the stimulable phosphor layer by applying heat from the surface opposite to the stimulable phosphor layer. .
According to the eighteenth aspect, a uniform heat seal can be obtained by pressing the stimulable phosphor plate from the stimulable phosphor layer side using an elastic member.

According to the nineteenth aspect of the present invention, one side opposite to the folded side is sealed, and affixed to a flat plate using the folded side as a position reference, so that the affixing position can have various tolerances (tolerance of cut-out size tolerance). , The stimulable phosphor plate is less susceptible to cutting dimension tolerance).

According to the twentieth aspect of the present invention, by sequentially performing pressure bonding from the aligned side, the stimulable phosphor plate or flat plate at the time of pressure bonding is less affected by the expansion and contraction of the sticking position.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealed phosphor plate according to an embodiment of the present invention.

FIG. 2 is a view for explaining sticking of a sealing phosphor plate shown in FIG. 1 to a flat plate;

FIG. 3 is a view illustrating a method of manufacturing the sealed phosphor plate of FIG. 1;

FIG. 4 is a view illustrating a method of manufacturing the sealed phosphor plate of FIG. 1;

FIG. 5 is a diagram illustrating a cross section of the film of FIG.

FIG. 6 is a configuration diagram of an apparatus for attaching a sealing phosphor plate and a flat plate.

FIG. 7 is a diagram illustrating the double-sided tape of FIG. 2;

FIG. 8 is a diagram showing the results of a first experiment.

FIG. 9 is a diagram showing the results of a second experiment.

FIG. 10 is a cross-sectional view of a conventional sealed phosphor plate.

FIG. 11 is a view for explaining sticking of the sealing phosphor plate shown in FIG. 10 to a flat plate.

[Explanation of symbols]

 101 stimulable phosphor plate 111 film

Claims (21)

[Claims] 1. A sealed phosphor characterized in that a stimulable phosphor plate is provided in a folded film and three sides other than the folded side are sealed by a folded sealing structure. plate. 2. The sealed phosphor plate according to claim 1, wherein the film is a moisture-proof film having a thickness of 200 μm or less. 3. The sealed phosphor plate according to claim 1, wherein the thickness of the film is 100 μm or less. 4. A stimulable phosphor plate is provided in a two-folded film, three sides other than the folded side are sealed by a folded sealing structure, and the folded side of the film is heat-sealed. A sealed phosphor plate. 5. The sealed phosphor plate according to claim 4, wherein the heat seal is applied with heat from the surface of the stimulable phosphor plate opposite to the surface of the stimulable phosphor layer. . 6. The sealed phosphor plate according to claim 1, which is used for mammography imaging. 7. A sealing phosphor plate in which a stimulable phosphor plate sealed by a film is adhered to a flat plate, wherein the flat plate has a warpage of 2.0 mm or less. Phosphor plate. 8. The sealed phosphor plate according to claim 7, which is used for mammography imaging. 9. A sealed phosphor plate in which a stimulable phosphor plate sealed by a film is attached to a flat plate, wherein the stimulable phosphor plate is provided in a folded film. And sealing is performed by a folded sealing structure in which three sides other than the folded side are sealed, and the folded side of the film is adhered along the vicinity of one side of the flat plate in the flat plate. Phosphor plate. 10. The sealed phosphor plate according to claim 9, wherein the flat plate has a warpage of 2.0 mm or less. 11. The distance between the edge of the stimulable phosphor plate on the folded side of the film and one side of the flat plate is 1.
The sealed phosphor plate according to claim 9, wherein the thickness is 0 mm or less. 12. The sealed phosphor plate according to claim 9, which is used for mammography imaging. 13. A transparent film is folded in two, two sides orthogonal to the folded side are sealed to form a bag-like film having an opening, and a stimulable phosphor plate is inserted through the opening of the bag-like film. Abutting the stimulable phosphor plate against the folded side of the bag-shaped film, depressurizing while pressing the stimulable phosphor plate with the plate, and sealing one side facing the folded side. Of producing a sealed phosphor plate. 14. The method according to claim 13, wherein the plate is transparent. 15. The sealed fluorescent material according to claim 14, wherein the stimulable phosphor plate is pressed by the plate while confirming the position of the stimulable phosphor plate in the bag-like film. Body plate manufacturing method. 16. A transparent film is folded in two, two sides orthogonal to the folded side are sealed to form a bag-shaped film having an opening, and a stimulable phosphor plate is inserted from the opening of the bag-shaped film; A method for manufacturing a sealed phosphor plate, characterized in that one side facing the folded side is sealed and the folded side of the film is heat-sealed. 17. The manufacturing of a sealed phosphor plate according to claim 16, wherein the heat seal applies heat from a surface of the stimulable phosphor plate opposite to a surface of the stimulable phosphor layer. Method. 18. The method according to claim 17, wherein the stimulable phosphor plate is pressed from the stimulable phosphor layer side using an elastic member. 19. A transparent film is folded in two, two sides orthogonal to the folded side are sealed to form a bag-like film having an opening, and a stimulable phosphor plate is inserted through the opening of the bag-like film. Abutting the stimulable phosphor plate against the folded side of the bag-shaped film, degassing while pressing the stimulable phosphor plate with the plate, sealing one side facing the folded side, A method for producing a sealed phosphor plate, wherein the method is applied to a flat plate with reference to a position. 20. A method for manufacturing a sealed phosphor plate, wherein the sealing phosphor plate stuck on a flat plate is pressure-bonded sequentially from the aligned side. 21. The method for producing a sealed phosphor plate according to claim 19, wherein the method is for mammography imaging.