JPS61237099A - Radiation picture conversion panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a radiation conversion panel comprising, in that order, a support, a phosphor layer containing a stimulable phosphor, and a V/IIIg.

[Technical Background of the Invention] As a method for obtaining radiation images as images, so-called radiography has conventionally been used, which uses a combination of a radiographic film having an emulsion layer made of a silver salt photosensitive material and an intensifying screen. There is. As an alternative to the radiographic method described above, a radiation image conversion method using a stimulable phosphor, as described in Japanese Patent Application Laid-open No. 55-12145, is attracting attention. Became. This radiation image conversion method uses a radiation image conversion channel (also called a stimulable phosphor sheet) containing a stimulable phosphor, and converts the radiation transmitted through the subject or the radiation emitted from the subject. The stimulable phosphor is absorbed by the panel's stimulable phosphor, and then the stimulable phosphor is exposed to electromagnetic waves (such as visible light and infrared rays).
The radiation energy stored in the stimulable phosphor is emitted as fluorescence (stimulated luminescence) by time-series excitation with excitation light (excitation light), and this fluorescence is read photoelectrically to obtain an electrical signal. , which converts the obtained electrical signals into images.

The radiographic image conversion method described above has the advantage that it is possible to obtain a radiographic image with a rich amount of information with much less radiation exposure SI@ compared to the conventional radiographic method. . Therefore, this radiation image conversion method has a very high utility value especially in direct medical radiography such as X-ray photography □ for the purpose of medical diagnosis.

The radiographic panel used in the radiation image conversion method described above has a basic structure consisting of a support and a phosphor layer provided on one side of the support. In addition, the surface of this phosphor layer opposite to the support (the surface not facing the support)
Generally, a transparent protective film is provided to protect the phosphor layer from chemical alteration or physical impact.

The phosphor layer is composed of a stimulable phosphor and a binder that contains and supports the stimulable phosphor in a dispersed state. After absorbing radiation such as II, it emits light when exposed to electromagnetic waves (excitation light) such as visible light and infrared
It has the property of exhibiting (stimulated luminescence). Therefore, the radiation transmitted through the subject or emitted from the subject is absorbed by the phosphor layer of the radiation image conversion panel in proportion to the amount of radiation. An image is formed as a cumulative image of radiation energy. This accumulated image can be emitted as stimulated luminescence by exciting the panel in time series with E-distribution electromagnetic waves, and by reading this stimulated luminescence photoelectrically and converting it into an electrical signal, radiation energy can be accumulated. It becomes possible to convert the image into an image.

The radiation image conversion panel is x! Since it is not easily deteriorated by irradiation with radiation such as I and excitation light, it is generally used repeatedly. On the other hand, the protective film provided on the surface of the phosphor layer of the panel is not intended to sufficiently isolate the phosphor layer from the outside air in order to fulfill its original purpose, which is to protect the phosphor layer from deterioration. It is preferable that there be.

Taking the above points into consideration, a synthetic resin thin film is attached to the surface of the phosphor layer of hitherto known radiation image storage panels to protect it.

In addition, the side surfaces (side edges) of the phosphor layer are protected not only from physical deterioration but also from chemical deterioration (by coating them with a resin coating layer, etc.). (blocking from).

However, the resin coating layer attached to the side surface of the phosphor layer may be partially separated or damaged due to impact caused by repeated use of the radiation image conversion panel, and in such cases, the phosphor layer may be partially separated or damaged. This results in insufficient layer protection and accelerated deterioration of the phosphor layer. This point is particularly likely to be a problem with phosphors that are susceptible to the influence of moisture in the environment.

[Object of the Invention 1 The object of the present invention is to provide a radiation image storage panel with improved moisture resistance.

An object of the present invention is to provide a technology that effectively blocks moisture from entering through the side surfaces (side edges) of a phosphor layer, thereby achieving improved moisture resistance of a radiation image storage panel. shall be.

[Summary of the Invention] The present invention provides a radiation image conversion panel having a support, a phosphor layer made of a supporting binder containing a stimulable phosphor in a dispersed state, and a retainer in this order. Substantially the entire surface of the part is covered with a sealant,
The radiation conversion panel is characterized in that the sealant is fixed from the outside by a sealant fixing member.

The sealing agent L is preferably made of a water-repellent material having a melting point of 100° C. or less, and examples thereof include silicone oil, grease, and wax.

[Effect of the Invention 1] The phosphor layer of the radiation image conversion panel of the present invention has its side surfaces covered and protected with a sealant.

The penetration of moisture through the side surface of the panel is effectively prevented or reduced, and even if the side surface of the panel is coated and protected with a resin coating layer, even if the resin coating layer peels off or is damaged, the phosphor This has the advantage that moisture can be prevented from penetrating through the side surfaces of the layer. Therefore, the configuration of the present invention is effective in preventing chemical deterioration of the phosphor layer, and is particularly useful when a phosphor that is susceptible to moisture is used in the phosphor layer.

[Detailed Description of the Invention 1 The radiation image conversion panel of the present invention can be manufactured, for example, by the method described below.

First, a phosphor layer is formed on a support. The phosphor layer is
This layer is made of a binder that contains and supports particles of a stimulable phosphor in a dispersed state.

The support used in the present invention can be arbitrarily selected from various materials used as supports for intensifying screens in conventional radiography methods or materials known as supports for radiation image conversion panels. . Examples of such materials include cellulose acetate, polyester,
Films of plastic materials such as polyethylene terephthalate, polyamide, polyimide, triacetate, polycarbonate, metal sheets such as aluminum foil, aluminum alloy foil, ordinary paper, baryta paper, resin coated paper, pigment paper containing pigments such as titanium dioxide, Examples include paper sized with polyvinyl alcohol or the like. However, when considering the characteristics and handling of the radiation image conversion panel as an information recording material.

A particularly preferred material for the support in the present invention is a plastic film. This plastic film may be kneaded with a light-absorbing substance such as carbon black, or may be kneaded with a light-reflecting substance such as titanium dioxide.

The former is a support suitable for a high sharpness type radiation image conversion panel, and the latter is a support suitable for a high sensitivity type radiation image conversion panel.

In known radiation image conversion panels, the phosphor layer is used to strengthen the bond between the support and the phosphor layer, or to improve the sensitivity or image quality (sharpness, graininess) of the radiation image conversion panel. A polymeric substance such as gelatin is coated on the support surface on the side where it is applied to form an adhesion-imparting layer, or a light-reflecting layer made of a light-reflecting substance such as titanium dioxide, or a light-absorbing substance such as carbon black. The support used in the present invention can also be provided with a light absorbing layer of the following types.

Furthermore, as described in JP-A-58-200200, in order to improve the sharpness of the obtained image, the surface of the support on the phosphor layer side (the surface of the support on the phosphor layer side) A light-reflecting layer or a light-absorbing layer, etc.
If provided, fine irregularities may be uniformly formed on the surface.

Next, a phosphor layer is formed on one of the supports.

The phosphor layer is a layer made of a binder containing and supporting particles of a stimulable phosphor in a dispersed state.

As mentioned above, a stimulable phosphor is a phosphor that exhibits stimulated luminescence when irradiated with radiation and then irradiated with excitation light.
From a practical standpoint, it is desirable that the phosphor be a phosphor that exhibits stimulated luminescence in the wavelength range of 30.0 to 500 nm when excited by excitation light with a wavelength in the range of 400 to 900 nm. Examples of stimulable phosphors include SrS:Ce, Sm%SrS:Eu, as described in U.S. Pat. No. 3,859,527.

Sm, The2:Er, and La2O2S:Eu, S
m, ZnS described in JP-A No. 55-12142
:Cu, Pb, BaO@xA1. O, :Eu (however,
0.8≦X≦lO), and.

M'O*xSiO, :A (where MI is Mg, Ca
, Sr, Zn, Cd, or Ba, and A is Ce, T
b, Eu, Tm, Pb, TfL, Bi, or Mn, and X is 0.5≦X≦2.5), as described in JP-A-55-12143 (
B & I-X-F, Mg
X, C & y) F
X: aEu” (where, X is at least one of C1 and Br, and X and y are 0 x + y
≦0.6. and xy≠0, and a is 10≦a≦5
X10-2 "is", LnO described in JP-A-55-12144
X: xA (Ln is La, Y, Gd, and Lu
X is at least one of C1 and Br, A is at least one of Ce and Tb, and X satisfies O<x<0.1), JP It is described in Publication No. 55-12145 (B
iL l−X , M ” X ) F X : V
A (However, M2° is Mg, Ca, Sr, Zn,
and at least one of Cd(7), where X is CJIB
r, and at least one of A is Eu, Tb
, Ce, Tm, Dy, Pr, Ho, Nd, Yb, and Er, and X is O≦X≦0
．． 6, y is 0≦y≦0.2).

M' described in Japanese Patent Application Laid-Open No. 55-160078
FX@xA: yLn [However, 1M is Ba, C
&, at least one of Sr, Mg, Zn, and Cd, A is Be01Mg01CaO, SrO, Bad,
ZnO, AJltOs, Y.

O3,La,O,,In,O,,5i02. TiO7
, ZrO2, Gem, 5n02. Nb2O3, Ta2
O! 1. and The? At least one of Ln
are Eu, Tb, Ce, Tm, Dy, Pr, Ho,
At least one of Nd, Yb, Er, Sm, and Gd, and X is at least one of Cl, Br, and E.

X and y are 5X10-'≦X≦0.5 and 0xy≦0.2, respectively.
a,,,M'x)F2*aB aX2:y
Eu, zA [However, 1M1 is beryllium, magnesium, calcium, strontium, and zinc.

and at least one of cadmium, X is chlorine,
At least one of bromine and iodine, A is at least one of zirconium and scandium, &, x, Y, and 2 are each 0.5≦a≦1.
25.0≦X≦1.1O-6≦y≦2X10-", and O<z≦to-" A phosphor represented by the composition formula 1.

It is described in Japanese Patent Application Laid-open No. 57-23673 (
Ba+-x, M 厘X) F2
@aBaX2: yEu, zB [However, MI is beryllium, magnesium, calcium, strontium, zinc.

and at least one of cadmium, X is chlorine,
at least one of bromine and iodine, a,
x, y, and 2 are each 0.5≦a≦1.25.0
≦X≦1.10−'≦y≦2×10−”, and O<z
A phosphor represented by the composition formula 1, which is ≦2X10-1.

It is described in Japanese Patent Application Laid-Open No. 57-23675 (
B a +-*, M'
III) F2・aB
a X 2 :yEu, zA [however,
MI is beryllium, magnesium, calcium, strontium, and □zinc.

and at least one of cadmium, X is chlorine,
At least one of bromine and iodine, A is at least one of arsenic and silicon, a, x, y,
and 2 are respectively 0.5≦a≦1.25.0≦X≦1
．． 10-6≦y≦2×lO−“, and 0 < z≦5
A phosphor represented by the composition formula:

M'O described in Japanese Patent Application Laid-open No. 58-69281
X: xCe [However, 1M is Pr, Nd, Pm, Sm
, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Bi, X is one or both of C1 and Br, and X is a phosphor represented by the composition formula of J, where 0<x<0.1, and B described in JP-A No. 58-208678
& l−)l M x /2 L X /l F X
: y E u ” [However, 1M is LJ, Na,
Represents at least one kind of alkali total flexion selected from the group consisting of Rb, and Cs; L is Sc, Y, La, and Cs;
e, Pr, Nd, Pm, Sm, Gd, Tb, Dy, Ho
, Er, Tm, Yb, Lu, An, Ga,
In, and at least one trivalent metal selected from the group consisting of Ti: X represents C1, Br, and ■
represents at least one halogen selected from the group consisting of: and X is 10-2≦X≦0゜5, y is O<v
A phosphor made with the composition formula 1 where ≦0.1, BaF described in Japanese Patent Application Laid-Open No. 59-27980
X* xA: yEu” [However, X is C1, B
r, and at least one kind of halogen from the group consisting of I; zA is a calcined product of a tetrafluoroboric acid compound: and X is 10=≦X≦o, x, y are o<y≦0 A phosphor represented by the composition formula 1 which is .1, Ba described in JP-A No. 59-47.
FX* xA: yEu” [However, X is C1,
Br, and at least one halogen selected from the group consisting of I, and zA is selected from the group of hexafluoro compounds consisting of salts of ~valent or divalent metals of hexafluorosilicic acid, hexafluorotitanic acid, and hexafluorozirconic acid. and x is 10-@≦X≦O, t, and V is O<
A phosphor represented by the composition formula: y≦0.1.

BaF described in Japanese Patent Application Laid-Open No. 59-56479
X* xNaX': aEu”° [However, X and Xo
are each at least one of Cl, Br, and Cl, and X and a are each O<X≦2. and O<a≦0.2], a phosphor represented by the composition formula of
X* xNaX':yEu": zA [However, 1M1
is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca;
are C1 and Br, respectively.

zA is at least one type of transition metal selected from V, Cr, Mn, Fe, Co, and Ni;
And X is 0<X≦2. V is o<y≦0.2. and 2 is O<z≦10-2].

M described in Japanese Patent Application Laid-open No. 59-75200
厘FXe aM'X' * bM'
"X", e cM'X"3 * x
A: yE u" [However, 1MI is at least one kind of alkaline earth metal selected from the group consisting of na, sr, and Ca, and M1 is Li, Na, Rb
, and at least one kind of alkali metal selected from the group consisting of Cs: M'1 is at least one divalent metal selected from the group consisting of Be and Mg: Mi
is at least one trivalent metal selected from the group consisting of AfL, Ga, In, and Tl; zA is a metal oxide; and X is at least one halogen selected from the group consisting of Cl, Br, and I. And Q: X',
X'' and t3LUX'' are at least one kind of halogen selected from the group consisting of F, Cl, Br, and I; and a is 0≦a≦2, b is 0≦b≦10-2. c.
A phosphor represented by the composition formula 1, where O≦C≦1O−2 and a+b+c≧10−8, where X is 0<x≦0.5, and y is o<y≦0.2.

M'x,・aM'X'2:xEu" described in the specification of Japanese Patent Application No. 58-193161 filed by the present applicant [where M is at least one selected from the group consisting of Ba, Sr, and Ca. is an alkaline earth metal: X and Xo are at least one halogen selected from the group consisting of C1, Br and I, and X≠X'':
and a is a numerical value in the range of 0.1≦a≦1O80,
X is a numerical value in the range of O<x≦0.2] A phosphor represented by the composition formula: xEu'' [where M' is at least one kind of alkaline earth metal selected from the group consisting of Ba, Sr, and Ca; is at least one halogen selected from the group consisting of Cl, Br, and
° is at least one kind of halogen selected from the group consisting of F, C1, Br, and engineering; and a and X are numerical values in the range of 0≦a≦4.0 and O<X≦0.2, respectively] A phosphor expressed by the composition formula.

Patent Application No. 1986- by the applicant [April 1985]
Application filed on April 2nd (1)] M'X stated in the statement of record: x
Bi [where MI is at least one alkali metal selected from the group consisting of Rb and Cs; X is CJ
At least one type of halogen selected from the group consisting of 1, Br, and I; and a phosphor represented by the composition formula 1, where .

In addition, the M-X!・aMM厘' 2: xEu2°
The phosphor contains the following additives M”X2・aM
It may be contained in the following proportions per 21 moles of 'X'.

bM'X" (where MI is Rb and Cs
X'' is at least one halogen selected from the group consisting of F, C1°Br and l, and b satisfies 0≦b≦1O00). Described in the specification of Application No. 59-77225
g
are Sc, Y, La.

It is at least one kind of trivalent metal selected from the group consisting of Gd and Lu, and X''XII l and x'''' are both at least one kind of halogen selected from the group consisting of F, Cl, Br and I.

and s, c and d are respectively 0≦b≦2゜0, O
≦C≦2.0.0≦d≦2.0, and 2×1O
-s≦b+C+d)2 VB described in the specification of Japanese Patent Application No. 59-84356 (however, y is 2 X 1
0-'≦y≦2X10-''): Patent application 1984-84
bA described in the specification of No. 358 (however, A is 5
at least one kind of oxide selected from the group consisting of int and P2O, and b is 1O-4≦b≦2
X l O-'): bsio described in Japanese Patent Application No. 59-240452 (however, b is o<b
≦3 x 10-2): Patent application 1987-24045
bSnX″2 (however, X
″ is at least one kind of halogen selected from the group consisting of F, C1, Br, and B, and b is o<b≦1
O-3) Two Japanese Patent Application No. 1988 [filed on April 11, 1986 (2)] bCsX", cSnx"' (provided that X'''' It Soi F, C!L, Br and l
at least one halogen selected from the group consisting of: b and C are o<b≦10.0 and 10-6≦C≦2×10-2, respectively); and Gansho 60-1 No. 1 [April 1, 1985]
1-day application (4)] bCsX listed in the If statement
"*yLn'° (just I,,X" is F.

At least one halogen selected from the group consisting of Cl, Br, and Ln, and Ln is Sc, Y, Ce, Pr,
Nd, Sm, Gd, Tb, Dy, Ho, Er,, Tm,
At least one rare earth element selected from the group consisting of Yb and Lu.

b and y are o<b≦10.0 and 1, respectively.
O-6≦y≦1.8 Halide-based phosphors are particularly preferred because they produce high-brightness stimulated luminescence. However, the stimulable phosphors used in the present invention are not limited to the phosphors described in E, and can be excited after irradiation with radiation. Any phosphor may be used as long as it emits bright light when irradiated with light.

In particular, in the present invention, even a phosphor having poor moisture resistance as described above can be suitably used without causing deterioration.

Specifically, the applicant's patent application No. 58-198758
・BaF(BrI-X I
X): yEu” phosphor (where X is 1x to-
; is a numerical value in the range of ≦x<1.0.

y is a numerical value in the range of o<y≦0.2)
F CX+-x , I It is a type of halogen, and X is a numerical value in the range of 0 to x≦1.0, and y is a numerical value in the range of 0 to y≦0.2)
, and a phosphor in which various components are added to the phosphor: M厘X2* aM"X'2: A phosphor obtained by adding various components to the phosphor; M described in the above-mentioned Japanese Patent Application No. 1988-
'
Examples include nOX:xA phosphors and phosphors obtained by adding various components to the phosphors.

Examples of binders for the phosphor layer include proteins such as gelatin,
Polysaccharides such as dextran, or natural polymers such as gum arabic: and polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethylcellulose, vinylidene chloride-vinyl chloride copolymer, polyalkyl (meth)acrylate, vinyl chloride/vinyl acetate Binders typified by synthetic polymeric materials such as copolymers, polyurethanes, cellulose acetate butyrate, polyvinyl alcohol, linear polyesters, etc. may be mentioned. Particularly preferred among such binders are nitrocellulose, linear polyester,
These are polyalkyl (meth)acrylates, mixtures of nitrocellulose and linear polyesters, and mixtures of nitrocellulose and polyalkyl (meth)acrylates.

Note that these binders may be crosslinked with a crosslinking agent.

The phosphor layer can be formed on the support by, for example, a primary method.

First, the above-mentioned stimulable phosphor and binder are added to a suitable solvent and thoroughly mixed to prepare a coating solution in which phosphor particles are uniformly dispersed in the binder solution.

Examples of solvents for preparing coating solutions include lower alcohols such as methanol, ethanol, n-propanol, and n-butanol; chlorine-containing hydrocarbons such as methylene chloride and ethylene chloride; acetone, methyl ethyl ketone, and methyl isobutyl ketone. Ketones: Esters of lower fatty acids and lower alcohols such as methyl acetate, ethyl acetate, and butyl acetate; Ethers such as dioxane, ethylene glycol monomethyl ether, and ethylene glycol monomethyl ether; and mixtures thereof.

The mixing ratio of the binder and the stimulable phosphor in the coating solution varies depending on the characteristics of the intended radiation image conversion panel, the type of light material, etc., but in general, the mixing ratio of the binder and the stimulable phosphor is , 1:l to 1:100 (weight ratio), and particularly preferably from 1:8 to 1:40 (weight ratio).

The coating liquid contains a dispersant to improve the dispersibility of the phosphor particles in the coating liquid, and a dispersant to improve the bonding force between the binder and the phosphor in the phosphor layer after formation. Examples of dispersants used for such purposes include various additives such as plasticizers that may be mixed with
Examples include phthalic acid, stearic acid, caproic acid, and lipophilic surfactants. Examples of plasticizers include phosphate esters such as triphenyl phosphate, tricresyl phosphate, and diphenyl phosphate; phthalate esters such as diethyl phthalate and dimethoxyethyl phthalate; ethyl phthalyl ethyl glycolate, butyl phthalyl butyl glycolate, etc. Glycolic acid esters: Examples include polyesters of polyethylene glycol and aliphatic dibasic acids, such as polyesters of triethylene glycol and adipic acid, and polyesters of diethylene glycol and succinic acid.

A coating film containing the phosphor particles and a binder prepared as described above is uniformly applied to the surface of a support to form a coating film. This coating operation can be carried out using one common coating means, such as a doctor blade, roll coater,
This can be done by using a knife coater or the like.

The formed coating film is then gradually heated and dried to complete the formation of the colored phosphor layer on the support.

The thickness of the phosphor layer varies depending on the characteristics of the intended radiation image conversion panel, the type of phosphor, the mixing ratio of the binder and the phosphor, etc., but is usually 20 ILm to 20 in. However, the thickness of this layer is preferably 50 to 500 μm.

Note that the phosphor layer does not necessarily need to be formed by directly applying a coating liquid to the support as described above, and may be formed by separately applying a coating liquid to a support such as a glass plate, a metal plate, a plastic sheet, etc.
After forming a phosphor layer by applying a coating solution to 4 and drying it, it may be pressed onto a support, or the support and phosphor layer may be bonded using an adhesive. good.

Next, a transparent protective film is provided on the surface of the phosphor layer opposite to the side that contacts the support.

Transparency*g is a cellulose conductor such as cellulose acetate or nitrocellulose; or polymethyl methacrylate, polyvinyl butyral, polyvinyl formal, or polycarbonate.

It can be formed by coating the surface of the phosphor layer with a solution prepared by dissolving a transparent polymer material, such as a synthetic polymer material such as polyvinyl acetate or vinyl chloride/vinyl acetate copolymer, in an appropriate solvent. can. Alternatively, it can also be formed by a method such as adhering a transparent thin film separately formed from polyethylene ntearate, polyethylene, monopolyvinylidene chloride, polyamide, etc. to the surface of the phosphor layer using a suitable adhesive.

In addition, in terms of moisture resistance of the radiation image storage panel, the protective film should be made of low moisture permeable plastic materials such as polyvinylidene chloride, two-wheel oriented polypropylene, high-density polyethylene, polytetrafluoroethylene, and polytrifluoroethylene. It is preferable that it is a transparent thin film.

In this case, the protective film has a moisture permeability of 45g/rrf・24h
It is preferably less than or equal to 40 g/rn, particularly preferably 40 g/rn.
”・24 hours or less. Here, moisture permeability refers to a temperature of 60°C.
and the amount of water vapor that passes through a unit area of film-like material in 24 hours under conditions of relative humidity 80% RH,
JIS Z 0208 standard moisture permeability test (cup method)
This is the value measured according to the following.

The protective layer may have a multilayer structure by laminating the thin films listed in L.
The thickness of the protective film thus formed is generally desirably about 3 to 25 ILm.

Note that the radiation image conversion panel of the present invention is disclosed in Japanese Patent Application Laid-Open No. 55-1
It may be colored with a coloring agent as described in Japanese Patent Publication No. 83500, Japanese Patent Application Laid-open No. 57-96300, etc., and this coloring can improve the group sharpness of the obtained image. Further, in the radiation image conversion panel of the present invention, white powder may be dispersed in the phosphor layer for the same purpose as described in Japanese Patent Application Laid-Open No. 146447/1983.

In the radiation image conversion panel of the present invention, substantially the entire side surface of the phosphor layer is coated with a sealant.

Further, the sealant is fixed from the outside by a sealant fixing member.

An example of the characteristic structure of the radiation image conversion panel of the present invention described in F will be described below with reference to the accompanying drawings.

FIG. 1 shows a plan view of a radiation image conversion panel according to the present invention, and FIG. 1-a is a plan view of the radiation image conversion panel of FIG.
'It is a sectional view taken along the I line. As shown in FIGS. 1 and 1-a, a radiation image conversion panel 1 of the present invention
0 is 5, its basic composition is a support 11, a phosphor layer 1
2. Protection [13° Consists of sealant 14 and sealant fixing member 15. The sealant 14 is arranged so as to cover substantially the entire side surface of the phosphor layer 12 (usually the entire surface of all four sides since the radiation image conversion panel is usually rectangular or square quadrilateral).・Ru.

In other words, by attaching the sealant in this arrangement,
It is possible to effectively prevent moisture from entering from the side surfaces of the phosphor layer.

The sealing agent used in the present invention has moisture penetration resistance 11
- Considering the effect, processing thereof, coating treatment on each side of the phosphor layer, etc., it is desirable to be made of a water-repellent material with a melting point of 100°C or less. Examples of such sealants include silicone. Mention may be made of oils, greases (petroleum grease, silicone grease, etc.) and waxes (paraffin wax, microcrystalline wax, petrolatum, etc.).

It may also be advantageous if the sealant consists of a water-repellent material which is in a liquid state at room temperature. In other words, if the sealant is in a liquid state at room temperature, even if the distance between the protective film and the support changes slightly, due to the surface tension.

Despite the above-mentioned interval variations, it is possible to continue to provide a predetermined sealing effect.

The sealant in the present invention is fixed and held by the side surface of the phosphor layer on the inside (on the side surface of the phosphor layer).
On the outside, a sealant fixing member is especially provided,
It is necessary to prevent the sealant from leaking or flowing out of the panel.

In Fig. wS1 and Fig. 1-a, a self-shape-retaining sealant fixing member 15 made of, for example, a plastic material is shown. It is desirable that the sealant fixing member 15 has its inner side in contact with the sealant 14 and is fixed to the E surface of the support body 11 and the lower surface of the protection member 11113 with adhesive.

The sealant fixing member may have substantially the same configuration as the phosphor layer as shown in FIG. It is also possible to cut out the groove and use the outer portion 25 of the groove as a fixing member for the sealant 24.

Alternatively, the sealant fixing member may be constructed from an extension 35 of the protective film as shown in FIG.゛That is, the protective film 33 provided on the E side of the phosphor layer 32 is attached so as to protrude slightly from the surface end of the phosphor layer 32 (@ lengthen), and the tip of this extended portion 35 and the support 31 A sealant fixing member can be formed by adhesively fixing the E side of the sealant fixing member. In addition, as another example of constructing such a sealant fixing member from an extended portion of a protective film, it is possible to adhesively fix the tip of an extended portion 45 of a protective film 43 to a support 41 as shown in FIG. An example can be given in which it is provided on the lower surface of the support (the surface not in contact with the phosphor layer). In this case, the sealant 44 may be provided in contact with both the side surface of the support body 41 and the side surface of the phosphor layer 42.

The sealant and sealant fixing member, which are the characteristic configurations of the present invention described below, are usually attached after forming a phosphor layer on the surface of the support and before attaching the protective film. Depending on the embodiment, it may be necessary to perform the process at the same time as the protective film is applied, or after the protective film is applied, or it may be desirable to perform the process in such a process.1 When manufacturing the radiation image conversion panel of the present invention, their manufacturing process.

There is no particular restriction on the manufacturing order.

[Brief explanation of drawings]

1 and 1-a show a plan view and a sectional view, respectively, of an embodiment of a radiation image conversion panel according to the present invention. FIGS. 2, 3, and 4 are cross-sectional views showing another configuration of the radiation image conversion panel according to the present invention. lO: Radiation image conversion panel 11.31.41: Support 12.32.42: Phosphor layer 13.33.43: Al-retaining film 14.24.34.44: Sealing agent 15.25.35.45: Sealant fixing member patent applicant Fuji Photo Film Co., Ltd. Representative Patent attorney Yasushi Yanagikawa Blade 1v! J Figure 1-a Figure 2

Claims (1)

[Scope of Claims] 1. A radiation image storage panel comprising, in this order, a support, a phosphor layer made of a binder containing and supporting a stimulable phosphor in a dispersed state, and a protective film, in which a side surface of the phosphor layer is provided. A radiation image conversion panel characterized in that substantially the entire surface of the panel is covered with a sealant, and the sealant is fixed from the outside by a sealant fixing member. 2. The radiation image conversion panel according to claim 1, wherein the sealant is made of a water-repellent material having a melting point of 100° C. or less. 3. The radiation image conversion panel according to claim 2, wherein the sealant is made of a water-repellent material that is in a liquid state at room temperature. 4. The radiation image storage panel according to claim 2, wherein the sealant is made of at least one substance selected from the group consisting of silicone oil, grease, and wax. 5. The radiation image conversion panel according to claim 1, wherein the sealant fixing member has substantially the same configuration as the phosphor layer. 6. The radiation image conversion panel according to claim 1, wherein the sealant fixing member is an extension of the protective film. 7. The radiation image conversion panel according to claim 1, wherein the sealant fixing member is a self-shape retaining member provided on the support member 7. 8. The radiation image conversion panel according to claim 1, wherein the protective film is made of a plastic material having a moisture permeability of 45 g/m^2·24 h or less. 9. A patent claim characterized in that the protective film is made of at least one material selected from the group consisting of polyvinylidene chloride, biaxially oriented polypropylene, high-density polyethylene, polytetrafluoroethylene, and polytrifluoroethylene The radiation image conversion panel according to item 8. 10. The above-mentioned stimulable phosphor has the basic compositional formula: M^IIF(X_1_-_x, I_x):yEu^2^+
[However, M^II is at least one alkaline earth metal selected from the group consisting of Ba, Sr, and Ca;
X is at least one halogen selected from the group consisting of Cl and Br; and x is 0<x≦1.0, y
0<y≦0.2] The radiation image storage panel according to claim 1, which is a divalent europium-activated alkaline earth metal fluorohalide-based phosphor. 11. The above-mentioned stimulable phosphor has a basic composition formula: M^IIX_2・aM^IIx'_2:xEu^2^+ [where M^II is at least one kind selected from the group consisting of Ba, Sr, and Ca. is an alkaline earth metal; X and X' are at least one halogen selected from the group consisting of Cl, Br, and I, and X≠X'; and a is 0.1≦a≦10. 0, x is 0<x≦0
．． 2] The radiation image storage panel according to claim 1, which is a divalent europium-activated alkaline earth metal halide phosphor having the following properties. 12. The above stimulable phosphor has the basic compositional formula: M^I X:xBi [where M^I is Rb and Cs
at least one alkali metal selected from the group consisting of: X is at least one halogen selected from the group consisting of Cl, Br, and I: and x is 0<x
≦0.2] The radiation image storage panel according to claim 1, wherein the radiation image storage panel is a bismuth-activated alkali metal halide phosphor having the following properties. 13. The above-mentioned stimulable phosphor has the basic composition formula: LnOX:xA [where Ln is at least one rare earth element selected from the group consisting of La, Y, Gd and Lu; X is composed of Cl and Br. at least one halogen selected from the group; A is Ce and Tb;
at least one rare earth element selected from the group consisting of; and x satisfies 0<x<0.1. 2. The radiation image conversion panel according to item 1.