JPH1020096A - Radiation intensifying screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radiation image having a high sharpness by forming a light reflection preventing film containing an organic solvent-soluble resin on the surface of a transparent protecting layer. SOLUTION: This screen is formed of a fluorescent intensifying screen support body 1, a phosphor layer 2 which is exited by receiving a radiation to generate a visual light, a transparent protecting layer 3, and a reflection preventing layer 4. As the phosphor, for example, a tungstate phosphor is used, and a binder (e.g. protein such as gelatin) and a solvent for binder (e.g. methanol) are mixed and dispersed to the phosphor to provide a phosphor coating solution. The coating solution is uniformly applied to the fluorescent intensifying screen support body 1 horizontally placed on a glass so as to have a dried thickness of a prescribed value to provide the phosphor layer 2. A transparent polyethylene terephthalate film is adhered to the phosphor layer 2 with the adhesive down to provide the protecting layer 3. The light reflection preventing layer 4 is formed on the fluorescent intensifying screen support body 1 in the same manner as in the phosphor layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high sharpness radiographic intensifying screen.

[0002]

2. Description of the Related Art Radiation intensifying screens are used in various fields such as medical radiography such as X-ray radiography for medical diagnosis and industrial radiography for nondestructive inspection of substances. In order to improve the sensitivity of the photographic system, it is used in close contact with one side or both sides of a silver halide photographic light-sensitive material (hereinafter, also referred to as a light-sensitive material), and is used by overlapping.

[0003] The radiation intensifying screen (hereinafter, also simply referred to as a screen) has, as a basic structure, a support and a phosphor layer provided on one surface thereof. Incidentally, a transparent protective layer made of a plastic film or the like is generally provided on the surface of the phosphor layer (the surface on the side not facing the support), and the phosphor layer is chemically or physically changed. Protects from impact. The protective film is usually provided on the phosphor by bonding a separately formed thin film using an adhesive.

[0004] The phosphor layer is composed of a binder that contains and supports the phosphor particles in a dispersed state. The phosphor particles have a property of emitting light of high luminance when excited by radiation such as X-rays. It has. Therefore, the phosphor emits light in accordance with the amount of radiation that has passed through the subject, and the photosensitive material placed in close contact with the surface of the phosphor layer of the screen is exposed by this light emission, so that relatively little radiation is emitted. With the amount, the photosensitive material can achieve sufficient exposure, and a radiation image of a subject is formed on the photosensitive material.

It is desired that a radiographic system (screen film system) composed of a screen and a photosensitive material used in radiographic photography has as high a sensitivity as possible in order to reduce the exposure dose of a subject as much as possible.

Further, it is desired that the obtained images have high image quality (sharpness, granularity, etc.).

Heretofore, in order to enhance the sensitivity of a screen film system, a radiation-sensitive photosensitive material having a structure in which a silver halide emulsion layer is provided on both sides of a support (double-sided photosensitive material) has been used. An imaging system in which screens (front screen and back screen) are arranged on both sides of a material is used.

In such a photographing system, the light emitted from the screen is not only absorbed (exposed) directly to the emulsion layer of the adjacent photosensitive material, but also absorbed (exposed) to the emulsion layer on the opposite side. Is reflected by the screen on the opposite side after passing through, so that the reflection is repeated between the screens on both sides before being absorbed by the photosensitive material. Therefore, the emulsion layers on both sides of the light-sensitive material are not only directly exposed to light emitted from the screen, but also to these multiple reflected lights (so-called crossover light). The crossover light spreads due to reflection by the screen and scattering when transmitted through the photosensitive material, and thus has a problem that image quality (sharpness) is reduced.

Therefore, a screen having excellent sharpness has been strongly desired.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a screen capable of obtaining a radiographic image with high sharpness.

[0011]

The above object is achieved by the following constitution.

1. In a radiographic intensifying screen having a phosphor layer and a transparent protective layer in this order on a support, an antireflection film containing an organic solvent-soluble resin is formed on the surface of the transparent protective layer. Radiation intensifying screen.

2. 2. The radiographic intensifying screen according to the item 1, wherein the organic solvent-soluble resin comprises an amorphous organic compound having a ring structure in a main chain.

3. 3. The radiographic intensifying screen according to the above item 1 or 2, wherein the organic solvent-soluble resin is a film formed of an organic fluorine compound.

4. The thickness of the light antireflection film is 0.01 to
4. The radiation intensifying screen according to any one of the items 1 to 3, wherein the radiation intensifying screen is in a range of 1 μm.

5. The radiation according to any one of claims 1 to 4, wherein a coating solution obtained by dissolving the organic solvent-soluble resin in an organic solvent is supplied onto the transparent protective layer, and an antireflection film is formed by a coating method. Intensifying screen.

6. The viscosity of the coating solution is 10 cps or less and / or the solid content weight ratio of the organic solvent-soluble resin (N
V) is 1% or more, The radiographic intensifying screen as described in 5 above, wherein

[7] A radiation intensifying screen having a phosphor layer and a transparent protective layer in this order on a support, wherein an antireflection film made of an inorganic material is formed on the surface of the transparent protective layer. .

8. 8. The radiation intensifying screen according to the item 7, wherein the inorganic substance is an inorganic fluorine compound.

9. The thickness of the light antireflection film is 0.01 to
9. The radiographic intensifying screen according to the item 7 or 8, wherein the radiographic intensifying screen is in a range of 1 μm.

Hereinafter, the present invention will be described in detail.

The screen of the present invention will be described in detail with reference to the following figures.

FIG. 1 shows the structure of a screen showing an example of the present invention. 1 is a support, 2 is a phosphor layer which is excited by receiving radiation to generate visible light, 3 is a transparent protective layer, and 4 is an antireflection film.

FIG. 2 is a cross-sectional view showing the relationship between clean and photosensitive material in a radiographic method using a screen. Reference numeral 5 denotes a radiographic cassette main body, 6 cassette lid, and 7 hinges. One of the main body and the lid 6 is fixed to be openable and closable by a hinge 7, and a flat container is formed in a sealed state.

Numeral 8 is a cushion material, and 9 is a screen, which is attached to a cushion material provided for maintaining adhesion, with the light emitting surfaces facing each other for the front surface (hereinafter referred to as front) and the back surface (hereinafter referred to as back). Reference numeral 10 denotes a photosensitive material having photosensitive emulsion layers on both sides, and 11 denotes a fixed frame of a cushion material.

The photosensitive material 10 is set so as to be sandwiched by the screen 9, the cover 6 is closed, and the photosensitive material 10 is pressure-bonded and degassed to be used for photographing.

FIG. 3 is a conceptual diagram showing crossover light which causes deterioration in the sharpness of a radiation image. The screen of FIG. 3 does not have an anti-reflection film.

The 10 photosensitive materials are the front 1 of the screen.
Radiation is radiated in close contact with the bag 2 and the bag 13.

The phosphor 17 is excited by radiation and
And the adjacent silver halide emulsion layer 16
Or cross-over light (1)
As 19, the emulsion layer 15 on the opposite side is also exposed to form an image.

The light transmitted through the photosensitive material 10 is transmitted through the screen 12 on the opposite side, and a part of the light is transmitted as crossover light (2) 20 on the surface, more specifically, the surface of the transparent protective layer 3. To expose the emulsion layer 15 and
Further, a part thereof becomes crossover light (3) 21 to expose the emulsion layer 16 on the opposite side to form a blurred image.

FIG. 4 is a conceptual view showing that the reflection of crossover light is prevented by the antireflection film of the present invention.

The cross-over light, which is excited by the radiation and emitted from the phosphor 17, has passed through the photosensitive material 10 is the cross-over light on the opposite side of the coated anti-reflection film 4 containing the organic solvent-soluble resin of the present invention. The light is transmitted through the screen without being reflected on the surface of the screen 12 to prevent the formation of a blurred image.

That is, in the screen provided with the antireflection film of the present invention, the luminescence excited at the front or back by X-ray irradiation is transmitted through each constituent layer of the photosensitive material and reflected at the corresponding back or front screen surface. To prevent the photosensitive material from contributing to the formation of a blurred image. As a result,
High sharpness can be obtained.

As the organic solvent-soluble resin of the present invention, for example, a molecular weight of 20,000 to 100,000 and a refractive index of 1.
An acetalized modified fluororesin or an etherified fluororesin having a low refractive index of 35 or less and soluble in an organic solvent is preferred. Specific examples of these resins are shown below, but the present invention is not limited thereto.

[0035]

Embedded image

Preferred organic solvents for dissolving the resin-soluble resin of the present invention include perfluoro-2-butylhydrofuran and perfluorotributylamine.

The anti-reflection coating of the present invention is prepared by coating a resin as shown in Chemical formula 1 with a solvent such as perfluoro-2-butylhydrofuran, perfluorotributylamine or a mixed solvent thereof. It is formed by coating on the surface and drying.

The undercoat layer is made of the transparent protective layer 3 of the antireflection film 4.
May be provided in order to improve the adhesiveness to the substrate.

The anti-reflection film 4 is a single layer film of the above-mentioned fluororesin, an amorphous organic compound having a ring structure in the main chain or an organic fluororesin, and improves the light transmittance of the transparent protective layer 3. In order that the thickness of the film to be formed is in the range of 50 nm to 1 μm, the fluororesin is “TEFL” shown in Chemical formula 1.
An amorphous fluororesin having a ring structure in the main chain such as "ON" AF or "CYTOP" is preferable, and the viscosity of the coating liquid is 1 cps or more and 10 cps or less, depending on selection including mixing of plural kinds of fluororesins and solvents. And NV is 1
% Or more and 20% or less.

Examples of the inorganic compound used for the inorganic antireflection film include magnesium fluoride, calcium fluoride,
Examples include inorganic fluorides such as cryolite and inorganic oxides such as aluminum oxide, zirconium dioxide, titanium dioxide, silicon monoxide, and silicon dioxide. It is particularly preferable to use an inorganic fluorine compound.

The thickness of the light antireflection film is such that the integrated value of (spectral emission intensity of the used phosphor) × (spectral reflectance of light antireflection film) × (spectral sensitivity of photosensitive material) becomes smallest. In other words, it is preferable to design the photosensitive material so that the sensitivity of the photosensitive material to the reflected light is minimized.

The thickness of the anti-reflection film is preferably on the order of the wavelength of the excitation light in view of its characteristics. The reflectance can be further reduced by forming the anti-reflection film into a multilayer structure.

Accordingly, the thickness of the antireflection film used in the screen of the present invention is preferably 0.01 to 1 μm, more preferably 0.05 to 0.4 μm.

The screen of the present invention may be colored with a known light-absorbing dye, and this coloring can improve the sharpness of an image obtained.

The coating and drying of the coating solution for the anti-reflection film 4 can be performed by a conventionally known knife coating, doctor coating, or the like.
It is performed by a method of applying by roll coating or the like and drying in a baking furnace.

As described above, the transparent protective layer 3 with the antireflection film 4 enables the formation of a radiation image with excellent sharpness.

Preferred phosphors used for the screen of the present invention include the following.

Tungstate-based phosphors (CaWO ₄ ,
MgWO ₄ , CaWO ₄ : Pb, etc.), terbium-activated rare earth oxysulfide-based phosphor [Y ₂ O ₂ S: Tb, Gd ₂ O ₂ S: T
b, La ₂ O ₂ S: Tb, (Y, Gd) ₂ O ₂ S: Tb,
(Y, Gd) O ₂ S: Tb, Tm, etc.], terbium-activated rare earth phosphate-based phosphor (YPO ₄ : Tb, GdPO ₄ : T
b, LaPO4: Tb, etc.), terbium-activated rare earth oxyhalide phosphor (LaOBr: Tb, LaOB)
r: Tb, Tm, LaOCl: Tb, LaOCl: T
b, Tm, LaOCl: Tb, Tm, LaOBr: T
b, GdOBr: Tb, GdOCl: Tb, etc., thulium-activated rare earth oxyhalide-based phosphor (LaOB)
r: Tm, LaOCl: Tm, etc.), barium sulfate phosphor _{[BaSO4: Pb, BaSO 4: Eu} 2+, (B
a, Sr) SO ₄ : Eu ²⁺ etc.] divalent eurobium-activated alkaline earth metal phosphate phosphor [(Ba ₂ P
O ₄ ) ₂ : Eu ²⁺ , (Ba ₂ PO ₄ ) ₂ : Eu ²⁺ etc.], divalent europium-activated alkaline earth metal fluorinated halide-based phosphor [BaFCl: Eu ²⁺ , BaFBr: Eu ^{2 +} ,
BaFCl: Eu ²⁺ , Tb, BaFBr: Eu ²⁺ , T
b, BaF ₂ .BaCl.KCl: Eu ²⁺ , (Ba, M
g) F2.BaCl.KCl: Eu ²⁺ etc.], iodide-based phosphors (CsI: Na, CsI: Tl, NaI, KI:
Tl, etc.), sulfide-based phosphor [ZnS: Ag (Zn, C
d) S: Ag, (Zn, Cd) S: Cu, (Zn, C
d) S: Cu, Al, etc.], hafnium phosphate-based phosphor (H
fP ₂ O ₇ : Cu, etc.), tantalate-based phosphor [YTaO
_{4, YTaO 4: Tm, YTaO} 4: Nb, (Y, Sr)
TaO ₄ , (Y, Sr) TaO ₄ : Nb, (Y, Sr) T
aO ₄ : Tm, LuTaO ₄ , LuTaO ₄ : Nb, (L
u, Sr) TaO ₄ , (Lu, Sr) TaO ₄ : Tm,
(Lu, Sr) TaO ₄ : Nb, (Lu, Sr) Ta
O ₄ : Tm, GdTaO ₄ : Tm, Gd ₂ O ₃ .Ta ₂ O ₅ .B
₂ O ₃ : Tb etc.], but the phosphor used in the present invention is not limited thereto, and any phosphor that emits light in the visible or near ultraviolet region upon irradiation with radiation can be used. .

Examples of the binder for the phosphor layer 2 include proteins such as gelatin, polysaccharides such as dextran or natural high molecular substances such as gum arabic, polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethylcellulose, vinylidene chloride.・ Vinyl chloride copolymer,
Binders represented by synthetic polymer substances such as polyalkyl (meth) acrylate, vinyl chloride / vinyl acetate copolymer, polyurethane, cellulose acetate butyrate, polyvinyl alcohol, linear polyester and the like can be mentioned. The binder may be cross-linked by a cross-linking agent. Among such binders, a binder that can use an inert solvent for the support 1 and a binder that is insoluble in the solvent of the antireflection film 4 are preferable.

Examples of the solvent for the above binder include lower alcohols such as methanol, ethanol, n-propanol and n-butanol; hydrocarbons containing chlorine atoms such as methylene chloride and ethylene chloride; acetone, methyl ethyl ketone and methyl isobutyl ketone. Ketones such as;
Esters of lower fatty acids and lower alcohols with methyl acetate, ethyl acetate and butyl acetate; dioxane, ethers such as ethylene glycol monoethyl ether and ethylene glycol monomethyl ether, and the like, and mixtures thereof. Therefore, when a plastic sheet is used for the support 1, it is preferable to use an inert solvent and a binder according to the inert solvent for the support 1.

The mixing ratio between the binder and the phosphor varies depending on the desired characteristics of the screen, the kind of the phosphor and the like, but is generally selected from the range of 1: 1 to 1: 100 (weight ratio). In particular, it is preferable to select from the range of 1: 8 to 1:40 (weight ratio).

Then, a coating solution of a binder solution in which the phosphor is dispersed with a solvent is prepared. The coating solution contains a dispersant for improving the dispersibility of the phosphor particles and a binder in the phosphor layer 2. Various additives such as a plasticizer for improving the bonding force of the phosphor particles may be mixed.

Examples of the dispersant used include phthalic acid, stearic acid, caproic acid, lipophilic surfactant and the like. 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; ethylphthalylethyl glycolate and butylphthalylbutyl glycolate; And polyesters of polyethylene glycol and aliphatic dibasic acid, such as polyesters of triethylene glycol and adipic acid, and polyesters of diethylene glycol and succinic acid.

The coating solution containing the phosphor and the binder prepared as described above is uniformly applied to the surface of the support 1 to form a coating film. This coating 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 form the phosphor layer 2 on the support.

Further, the phosphor layer 2 does not necessarily need to be formed by directly applying the coating solution on the support as in the above, and the coating solution is coated on another temporary support or the protective layer in the same manner as described above. Then, after the phosphor layer is formed by drying, the phosphor layer may be bonded to the support by pressing the phosphor layer on the support or using an adhesive.

As the support or temporary support used for the screen of the present invention, for example, those made of various materials such as glass, wool, cotton, paper, and metal can be used. Those that can be processed into a flexible sheet or roll for handling are preferable. From this point, for example, cellulose acetate film, polyester film, polyethylene terephthalate film, polyamide film, polyimide film, triacetate film, plastic film such as polycarbonate film, aluminum foil, metal sheet such as aluminum alloy foil, general paper and, for example, photographic Base paper, printing base paper such as coated paper or art paper, baryta paper, resin coated paper, paper sized with polysaccharide as described in Belgian Patent 784,615, pigments such as titanium dioxide Pigmented paper containing, and processed paper such as paper sized with polyvinyl alcohol are particularly preferred.

The thickness of the phosphor layer 2 depends on the characteristics of the target screen, the kind of the phosphor, the mixing ratio of the binder and the phosphor, etc., but is usually in the range of 20 μm to 1 mm, preferably 50 μm. ５００500 μm.

A transparent protective layer 3 for physically and chemically protecting the phosphor layer 2 together with the support 1 is provided. Such a transparent protective layer, for example, polyethylene terephthalate, polyethylene naphthalate, polyethylene, polyvinylidene chloride, a plastic sheet made of polyamide and the like and a protective layer forming sheet such as a transparent glass plate is separately prepared and formed on the surface of the phosphor layer. It can be formed by a method such as bonding using an appropriate adhesive. Alternatively, a cellulose derivative such as cellulose acetate or nitrocellulose, or a synthetic polymer such as polymethyl methacrylate, polyethylene terephthalate, polyvinyl butyral, polyvinyl formal, polycarbonate, polyvinyl acetate, vinyl chloride, or vinyl acetate copolymer is dissolved in an appropriate solvent. The solution prepared as described above can be formed by applying the solution to the surface of the phosphor layer.

These polymer substances can be used alone or in combination. When the transparent protective layer is formed by coating, it is desirable to add a crosslinking agent immediately before coating.

The transparent protective layer is formed on the phosphor layer and is preferably a transparent synthetic resin layer having a thickness of 10 μm or less. By using such a thin transparent protective layer, the distance from the phosphor to the silver halide emulsion is shortened, so that a decrease in sharpness can be prevented.

[0062]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the embodiments of the present invention are not limited thereto.

Example 1 A phosphor coating solution was prepared by mixing and dispersing 200 g of a powdery phosphor (Gd ₂ O ₂ S: Tb) with 10 g of a binder polyurethane and 50 g of a solvent methyl ethyl ketone for 6 hours in a ball mill. This coating solution was placed horizontally on a glass plate.
A 50 μm polyethylene terephthalate support was uniformly coated with a knife coater so as to have a dried film thickness of 120 μm to form a phosphor layer.

Then, a transparent polyethylene terephthalate film having a thickness of 8 μm and a polyester adhesive applied on one side is adhered to the phosphor layer with the adhesive down,
A protective layer was provided.

Next, "TEFLON" A manufactured by DuPont
Using F, a coating solution having a viscosity of 8 cps and NV of 2.0% using perfluoro-2-butylhydrofuran as a solvent was prepared and coated by the same method as that for providing the phosphor layer on the support.
After drying, an anti-reflection film having a thickness of 100 nm was formed.

Thus, the screen 1 of the present invention comprising the support, the phosphor layer, the transparent protective layer and the antireflection film was produced.

Example 2 A solution having a viscosity of 9 cps and a NV of 1.0% using perfluorotributylamine as a solvent was prepared using “CYTOP” manufactured by Asahi Glass Co., Ltd. as a coating solution for forming an anti-reflection film. A screen 2 of the present invention was obtained under the same conditions as those of the screen 1 of the present invention in Example 1 except that the screen 2 was used.

Example 3 A layer of ZrO ₂ , SiO ₂ , and MgF ₂ was layered in this order with substantially the same thickness using a vacuum deposition apparatus SEC-10 manufactured by Showa Vacuum Co., Ltd. to prevent light reflection of 100 nm in thickness. A screen 3 of the present invention was produced in the same manner as the radiographic intensifying screen 1 of the present invention in Example 1 except that a film was formed.

Example 4 Thickness of 100 nm in the production of the screen 3 of Example 3
Screen 4 of the present invention was produced in the same manner as in Example 3 except that the light reflection preventing film was made of MgF ₂ .

Preparation of Comparative Screen A comparative screen 5 was prepared in the same manner as in Example 1 except that the antireflection film was not provided on the protective layer.

Evaluation of Screen a) Evaluation of Light Antireflection Ability (Reflectance) The light antireflection ability of the light antireflection film surface of each screen described above was measured using a spectrophotometer 557 (Hitachi, Ltd.) at a wavelength of 545 nm. Was evaluated by the surface reflectance of light.

B) Sharpness The obtained screen sample was subjected to X-ray film SR-G.
(Manufactured by Konica Corporation) and used for Funk Test Chart SM
S-5853 (sold by Konica Medical Co., Ltd.) A rectangular wave chart is photographed, and an automatic developing machine SRX-502 (manufactured by Konica Co., Ltd.) and a processing solution SR-DF (both manufactured by Konica Co., Ltd.)
Was performed at a developing temperature of 35 ° C. and a fixing temperature of 33 ° C. for 45 seconds, and the MTF was measured by a contrast method. MTF
The value is shown as a value of a spatial frequency of 2.0 cycles / mm. Therefore, the higher the MTF value, the higher the sharpness.

The results of these evaluations are summarized in Table 1.

[0074]

[Table 1]

From Table 1, it can be seen that the screens 1 to 4 of the present invention having the antireflection film on the surface of the transparent protective layer have lower surface reflectance than the comparative screen 5 without the antireflection film on the surface of the transparent protective layer. It can be seen that the sharpness is high.

[0076]

According to the present invention, a screen having excellent sharpness is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a radiation intensifying screen of the present invention.

FIG. 2 is a cross-sectional view showing a relationship between a screen and a photosensitive material in a radiographic method using a radiographic intensifying screen.

FIG. 3 is a conceptual diagram illustrating crossover light that causes deterioration in the sharpness of a radiation image.

FIG. 4 is a conceptual diagram showing that reflection of crossover light is prevented by the anti-reflection film of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluorescent intensifying screen support 2 Phosphor layer 3 Transparent protective layer 4 Antireflection film (front side) 4 'Antireflection film (back side) 5 Cassette 6 Lid 7 Hinge 8 Cushion material 9 Screen 10 Silver halide photograph Photosensitive material 11 Cushion fixing frame 12 Radiation intensifying screen (front side) 13 Radiation intensifying screen (back side) 14 Photosensitive material support 15 Silver halide emulsion layer (front side) 16 Silver halide emulsion layer (back side) 17 phosphor emission point 18 excitation light emission 19 crossover light (1) 20 crossover light (2) 21 crossover light (3)

Claims (9)

[Claims] 1. A radiation intensifying screen having a phosphor layer and a transparent protective layer in this order on a support, wherein an antireflection film containing an organic solvent-soluble resin is formed on the surface of the transparent protective layer. A radiographic intensifying screen, characterized in that: 2. The radiographic intensifying screen according to claim 1, wherein the organic solvent-soluble resin comprises an amorphous organic compound having a ring structure in a main chain. 3. The radiation intensifying screen according to claim 1, wherein the organic solvent-soluble resin is a film formed of an organic fluorine-based resin. 4. The light reflection preventing film has a thickness of 0.01 to 1
The radiation intensifying screen according to claim 1, wherein the radiation intensifying screen is in a range of μm. 5. The anti-reflection film according to claim 1, wherein a coating solution obtained by dissolving the organic solvent-soluble resin in the organic solvent is supplied onto the transparent protective layer, and an anti-reflection film is formed by a coating method. Item 2. The radiation intensifying screen according to item 1. 6. The coating solution has a viscosity of 10 cps or less and / or a solid content weight ratio (N
The radiation intensifying screen according to claim 5, wherein V) is 1% or more. 7. A radiation intensifying screen having a phosphor layer and a transparent protective layer in this order on a support, characterized in that an anti-reflection film made of an inorganic substance is formed on the surface of the transparent protective layer. Radiation intensifying screen. 8. The radiation intensifying screen according to claim 7, wherein the inorganic substance is an inorganic fluorine compound. 9. The anti-reflection film having a thickness of 0.01 to 1
The radiographic intensifying screen according to claim 7, wherein the radiographic intensifying screen is in a range of μm.