JPH0631908B2 - Radiation image conversion panel containing silane coupling agent - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radiation image conversion panel using a stimulable phosphor, and more specifically, durability that can be used in a good state for a long period of time. And a radiation image conversion panel having excellent durability.

(Prior Art) Radiation images such as X-ray images are often used for disease diagnosis. In order to obtain this X-ray image, X-rays that have passed through the subject are irradiated onto the phosphor layer (fluorescent screen), thereby generating visible light, and this visible light is used in the same way as when taking a normal photograph. A so-called radiograph in which a film using salt is irradiated and developed is used. Further, a method is known in which an image is directly taken out from the phosphor layer without using a film coated with silver salt.

As this method, the radiation that has passed through the subject is absorbed by the phosphor, and then the phosphor is excited by, for example, light or thermal energy, so that the radiation energy accumulated by the absorption by the phosphor is converted into fluorescence. There is a method in which the fluorescence is emitted and the fluorescence is detected to form an image. Specifically, for example, US Pat. No. 3,859,527 and JP-A-55-12
No. 144 discloses a radiation image conversion method using a stimulable phosphor and using visible light or infrared light as stimulated excitation light. This method uses a radiation image conversion panel in which a stimulable phosphor layer is formed on a support. The latent energy is formed by accumulating the radiation energy corresponding to the radiation transmittance of, and thereafter the stimulable phosphor layer is scanned with the stimulable excitation light to radiate the accumulated radiation energy of each part. Is converted into light, and an image is obtained by an optical signal depending on the intensity of the light. This final image may be played as a hard copy or on a CRT.

The radiation image conversion panel used in this radiation image conversion method releases the stored energy by scanning the excitation light after storing the radiation image information, so that the radiation image can be stored again after scanning and can be used repeatedly. Is. Therefore, it is a matter of course that an image obtained by the radiation image conversion panel is desired to have a high image quality, but a performance (durability) capable of withstanding long-term use or repeated use many times is required.

However, stimulable phosphors generally have a high hygroscopic property, and when left in a room under normal climatic conditions, they adsorb moisture in the air and their performance deteriorates over time. Specifically, a phenomenon occurs in which the sensitivity to radiation is reduced and the fading speed of a latent image generated by irradiation with radiation is increased.

Conventionally, in order to prevent these deterioration phenomena due to moisture absorption of the stimulable phosphor, as shown in, for example, Japanese Patent Application No. 60-154559, a protective layer having a low moisture permeability is provided to the stimulable phosphor. Although a method of suppressing the moisture from reaching the phosphor layer has been taken, a technique for imparting moisture resistance to the stimulable phosphor layer itself is desired.

In addition to moisture resistance, physical properties and abrasion resistance of the stimulable phosphor layer are also required as properties required for a durable radiation image conversion panel that can withstand repeated use many times. The physical strength of the stimulable phosphor layer obtained by dispersing the stimulable phosphor layer in the binder resin can be increased by increasing the content of the binder. However, in order to improve the radiation sensitivity of the radiation image conversion panel, it is preferable to make the content of the binder as small as possible to increase the packing density of the stimulable phosphor. From the above, there is a demand for a technique for enhancing the physical strength and abrasion resistance of the stimulable phosphor layer without increasing the content of the binder.

(Object of the Invention) The present invention has been made in view of the above-mentioned current situation in a radiation image conversion panel using a stimulable phosphor, and an object of the present invention is to provide excellent moisture resistance and physical strength. Another object of the present invention is to provide a radiation image conversion panel which has a stimulable phosphor layer and can be used in a good state for a long period of time and which has excellent durability and durability.

(Structure of the Invention) The above-described object of the present invention is to provide a stimulable phosphor layer in a radiation image conversion panel having a stimulable phosphor layer in which a stimulable phosphor is dispersed in a binder. It is achieved by a radiation image conversion panel characterized by containing a silane coupling agent.

Hereinafter, the present invention will be described in detail.

The silane coupling agent used in the radiation image conversion panel of the present invention (hereinafter sometimes simply referred to as "panel" when the meaning is clear) is a compound represented by the following general formula.

General formula In the formula, R represents an aliphatic or aromatic hydrocarbon group, which may have an unsaturated group (for example, vinyl group), or RO
R'-, RCOOR'-, RNHR'- (R is an alkyl group, an aryl group, R'is an alkylene group, an arylene group) and may be substituted with other substituents.

X ₁ , X ₂ and X ₃ represent an aliphatic or aromatic hydrocarbon group, an acyl group, an amide group, an alkoxy group, an alkylcarbonyloxy group, an epoxy group, a mercapto group or a halogen atom, and X ₁ , X ₂ And X ₃ may be the same or different from each other. However, at least one is a group other than a hydrocarbon group.

It is preferable that X ₁ , X ₂ and X ₃ are groups that undergo hydrolysis.

Specific examples of the silane coupling agent, methyltrimethoxysilane, methyltriethoxysilane, vinyltriacetoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, γ-chloropropyltrimethoxysilane, γ-chloropropylmethyldichlorosilane, γ-
Chloropropylmethyldimethoxysilane, γ-chloropropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane, N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ -Aminopropylmethyldimethoxysilane,
γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropylmethyldimethoxysilane, γ- (2 -Aminoethyl) aminopropyltrimethoxysilane, γ- (2-aminoethyl) aminopropylmethyldimethoxysilane,
γ-anilinopropyltrimethoxysilane, vinyltrimethoxysilane, γ-mercaptopropylmethyldimethoxysilane, N-β- (N-vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane / hydrochloride and aminosilane compound, etc. Can be given. Of these, vinyl-based, mercapto-based, glycidoxy-based, and methacryloxy-based silane coupling agents are particularly preferable.

When a silane coupling agent is added when forming a stimulable phosphor layer containing a stimulable phosphor in the binder, the silane coupling agent reacts with an organic group in the binder. The moisture-proof property, physical strength and abrasion resistance of the stimulable phosphor layer can be improved. Further, by adding a silane coupling agent, it is possible to enhance the adhesion between the stimulable phosphor layer and the support, or at the interface between the stimulable phosphor layer and the protective layer.

Furthermore, since the silane coupling agent has the effect of increasing the affinity of the inorganic powder for the organic resin, it improves the dispersibility of the stimulable phosphor particles in the binder resin and improves the image quality of the obtained image. be able to.

The amount of the silane coupling agent added is preferably 0.01% by weight to 10% by weight, more preferably 0.05% by weight to 5% by weight, based on the stimulable phosphor.

In the radiation image conversion panel of the present invention, the stimulable phosphor means a stimulus such as an optical, a thermal, a mechanical, a chemical, or an electrical stimulus (stimulation excitation) after being irradiated with the first light or high-energy radiation. ), The phosphor that exhibits stimulated emission corresponding to the dose of the first light or high-energy radiation, but from a practical point of view, preferably a phosphor that exhibits stimulated emission by stimulated excitation light of 500 nm or more. is there. Examples of the stimulable phosphor used in the radiation image conversion panel of the present invention include BaSO ₄ : Ax (where A is at least one of Dy, Tb, and Tm) described in JP-A-48-80487. Yes, x is
0.001 ≦ x <1 mol%. ) Phosphor represented by
MgSO ₄ : Ax described in JP-A-48-80488 (where A is Ho or D
Either y, 0.001 ≤ x ≤ 1 mol%)
And SrSO ₄ : Ax described in JP-A-48-80489 (wherein A is at least one of Dy, Tb and Tm, and x is 0.001 ≦ x <1 mol% ), A phosphor obtained by adding at least one of Mn, Dy and Tb to Na ₂ SO ₄ , CaSO ₄ and BaSO ₄ described in JP-A-51-29889. , Phosphors such as BeO, LiF, MgSO ₄ and CaF ₂ described in JP-A-52-30487, and Li ₂ B ₄ O ₇ : Cu, Ag described in JP-A-53-39277. Of the phosphor described in JP-A-54-47883, Li ₂ O. (B
₂ O ₂ ) x: Cu (where x is 2 <x ≦ 3), and Li ₂ O · (B ₂ O
₂ ) x: Cu, Ag (where x is 2 <x ≦ 3) or other phosphor, SrS: Ce, Sm, Sr described in US Pat. No. 3,859,527
S: Eu, Sm, La ₂ O ₂ S: Eu, Sm and (Zn, Cd) S: Mn, X
(However, X is a halogen). Further, it is described in JP-A-55-12142. ZnS: C
u, Pb phosphor, general formula is BaO.xAl ₂ O ₃ : Eu (where 0.8 ≦ x
≦ 10) and a barium aluminate phosphor represented by the general formula, and a general formula of M ^II O · xSiO ₂ : A (where M ^II is Mg, Ca, Sr, Z).
n, Cd or Ba, A is at least one of Ce, Tb, Eu, Tm, Pb, Tl, Bi and Mn, and x is 0.5 ≦ x <2.5. ) Alkaline earth metal silicate-based phosphors represented by Also, the general formula is (Ba _1-xy Mg _x Ca _y ) FX: eEu ²⁺ (where X is at least one of Br and Cl, x,
y and e are 0 <x + y ≦ 0.6, xy ≠ 0 and 10 ^{−6, respectively.}
It is a number that satisfies the condition ≦ e ≦ 5 × 10 ^-2 . ) Alkaline earth fluorohalide phosphor represented by JP-A-55-1
The general formula described in No. 2144 is LnOX: xA (where Ln is at least one of La, Y, Gd and Lu, and X is
Cl and / or Br, A is Ce and / or Tb, x is 0 <x
Represents a number that satisfies <0.1. ) Phosphor represented by
The general formula described in JP-A-55-12145 is (Ba _1-x M ^II _x ) FX: yA (where M ^II is at least one of Mg, Ca, Sr, Zn and Cd, X Is at least one of Cl, Br and I, A
Is at least one of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb and Er, and x and y are 0 ≦ x ≦ 0.6 and 0 ≦ y
Represents a number that satisfies the condition ≤0.2. ), The general formula described in JP-A-55-84389 is BaF.
X: xCe, yA (wherein X is at least one of Cl, Br and I, A is at least one of In, Tl, Gd, Sm and Zr, and x and y are each 0 <x. ≦ 2 × 10 ⁻¹ and 0 <y ≦ 5 × 10 ⁻² ), the general formula described in JP-A-55-160078 is M ^II FX · xA: yLn (however, M ^II is at least one of Mg, Ca, Ba, Sr, Zn and Cd, A is BeO, 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 , ZrO ₂ , GeO ₂ , S
nO ₂ , Nb ₂ O ₅ , at least one of Ta ₂ O ₅ and ThO ₂ , L
n is Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Sm and G
at least one of d, X is at least one of Cl, Br and I, and x and y are each 5 ×
It is a number satisfying the conditions of 10 ⁻⁵ ≦ x ≦ 0.5 and 0 <y ≦ 0.2. ) Rare earth element inactive divalent metal fluorohalide phosphor represented by the general formula: ZnS: A, CdS: A, (Zn, Cd)
S: A, ZnS: A, X and CdS: A, X (where A is Cu, A
g, Au, or Mn, and X is halogen. ), Any one of the following general formulas described in JP-A-57-148285 xM ₃ (PO ₄ ) ₂ · NX ₂ : yA M ₃ (PO ₄ ) ₂ · yA (wherein M And N are Mg, Ca, Sr, Ba, Zn and Cd, respectively.
At least one of X, at least one of F, Cl, Br and I, A is Eu, Tb, Ce, Tm, Dy, Pr, Ho,
It represents at least one of Nd, Yb, Er, Sb, Tl, Mn and Sn. Further, x and y are numbers satisfying the conditions of 0 <x ≦ 6 and 0 ≦ y ≦ 1. ), One of the following general formulas nReX ₃ · mA ▲ X ^′ ₂ ▼: xEu nReX ₃ · mA ▲ X ^′ ₂ ▼: xEu, ySm (where _Re is La, Gd, Y, Lu) At least one of them,
A is at least 1 of alkaline earth metal, Ba, Sr, Ca
The species X and X'represent at least one of F, Cl and Br. Further, x and y are 1 × 10 ⁻⁴ <x <3 × 10 ⁻¹ , 1
^{X10 -4} <y <1 × 10 ^-1 , which is a number satisfying the condition n /
m satisfies the condition of 1 × 10 ⁻³ <n / m <7 × 10 ⁻¹ . )
In phosphor represented the following general formula ^{M I X · aM II ▲ X} '2 ▼ · bM III ▲ X "3 ▼: cA ( where, M ^I is Li, Na, K, selected from Rb and Cs of at least One of the alkali metals, M ^II is Be, Mg, Ca,
It is at least one divalent metal selected from Sr, Ba, Zn, Cd, Cu and Ni. M ^III is Sc, Y, La, Ce, Pr, Nd, P
m, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Al, Ga
And at least one trivalent metal selected from In.
X, X'and X "are at least one halogen selected from F, Cl, Br and I. A is Eu, Tb, Ce, Tm, Dy,
Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm, Y, Tl, Na, Ag, Cu
And at least one metal selected from Mg. Further, a is a numerical value in the range of 0 ≦ a ≦ 0.5, and b is 0 ≦ b ≦.
It is a numerical value in the range of 0.5, and c is a numerical value in the range of 0 <c ≦ 0.2. ) Alkali halide phosphors represented by).

Alkali halide phosphors are particularly preferable in terms of radiation sensitivity.

However, the stimulable phosphor used in the radiation image conversion panel of the present invention is not limited to the above-mentioned phosphor,
Any phosphor may be used as long as it exhibits stimulated emission when it is irradiated with radiation and then stimulated by excitation light.

The average particle size of the stimulable phosphor used is 0.1 to 100 μm in consideration of the sensitivity and granularity of the radiation image conversion panel.
It is appropriately selected within the range of m. More preferably, those having an average particle size of 0.5 to 40 μm are used.

The radiation image conversion panel of the present invention may be a stimulable phosphor layer group composed of one or two or more stimulable phosphor layers containing at least one kind of the stimulable phosphor described above. The stimulable phosphors contained in each stimulable phosphor layer may be the same or different.

The stimulable phosphor layer is prepared by dispersing stimulable phosphor particles in a solvent together with an appropriate binder and a silane coupling agent to prepare a coating solution, which is then coated on a support or a protective layer. It is created by applying to.

Examples of the binder used in the present invention include proteins such as gelatin, polysaccharides such as dextran or gum arabic, polyvinyl butyral, polyvinyl acetate, nitrocellulose, ethyl cellulose, vinylidene chloride-vinyl chloride copolymer, polymethylmethacrylate, The film-forming binder usually used for the layer constitution such as vinyl chloride-vinyl acetate copolymer, polyurethane, cellulose acetate butyrate, polyvinyl alcohol and the like is used. Generally, the binder is used in the range of 0.01 to 1 part by weight with respect to 1 part by weight of the stimulable phosphor. However, in terms of sensitivity and sharpness of the obtained radiation image conversion panel, it is preferable that the amount of the binder is small, and the range of 0.03 to 0.2 parts by weight is more preferable from the viewpoint of easy coating.

Examples of the solvent used for preparing the coating liquid for the stimulable phosphor layer include methanol, ethanol, isopropanol,
Lower alcohols such as n-butanol, acetone, methyl ethyl ketone, methyl isobutyl ketone, ketones such as cyclohexanone, methyl acetate, ethyl acetate, acetic acid n
-Esters of lower fatty acids and lower alcohols such as butyl, ethers such as dioxane, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, aromatic compounds such as triol and xylol, halogenated hydrocarbons such as methylene chloride and ethylene chloride, and Examples thereof include a mixture thereof.

Incidentally, in the coating liquid for the stimulable phosphor layer, stearic acid, for the purpose of improving the dispersibility of the stimulable phosphor layer phosphor particles,
Dispersants such as phthalic acid, caproic acid and lipophilic surfactants may be mixed. Moreover, you may add the plasticizer with respect to a binder as needed. Examples of the plasticizer include phthalates such as diethyl phthalate and dibutyl phthalate,
Examples thereof include phosphates such as tricresyl phosphate and triphenyl phosphate, diisodecyl succinate and dibasic aliphatic acid such as dioctyl adipate, and glycolic acid esters such as ethylphthalylethyl glycolate and butylphthalylbutyl glycolate.

The coating liquid for the stimulable phosphor is prepared using a dispersing device such as a ball mill, a sand mill, an attritor, a triple roll mill, a high speed impeller disperser, a Kady mill, and an ultrasonic disperser. The stimulable phosphor layer is formed by coating the prepared coating liquid on a support using a coating machine such as a doctor blade, a roll coater or a knife coater and drying. The coating liquid may be applied onto the protective layer and dried, and then the stimulable phosphor layer and the support may be bonded to each other.

The film thickness of the stimulable phosphor layer of the radiation image conversion panel of the present invention is the desired characteristics of the radiation image conversion panel, the type of stimulable phosphor, the mixing ratio of the binder and the stimulable phosphor, etc. Depending on the type, it is preferably selected from the range of 10 μm to 1000 μm, more preferably 10 μm to 500 μm. For the purpose of improving the sharpness of the radiation image conversion panel of the present invention, a white powder is dispersed in the stimulable phosphor layer of the radiation image conversion panel as disclosed in JP-A-55-146447. Also, as disclosed in JP-A-55-163500, a stimulable phosphor layer of a radiation image conversion panel or a support or a protective layer on the bottom surface of the phosphor layer for incident stimulating excitation light. It may be colored with a coloring agent that absorbs the stimulated excitation light.

The stimulable phosphor layer may have a honeycomb structure as disclosed in JP-A-59-202100. Alternatively, as described in Japanese Patent Application No. 59-186859, the stimulable phosphor particles may have a predetermined particle size distribution in the layer thickness direction of the stimulable phosphor layer.

As the support used in the radiation image conversion panel of the present invention, various polymer materials, glass, metal and the like are used. In particular, a material that can be processed into a flexible sheet or web for handling as an information recording material is preferable,
From this point, for example, a cellulose acetate film, a polyester film, a polyethylene terephthalate film, a polyamide film, a polyimide film, a triacetate film, a plastic film such as a polycarbonate film, a metal sheet of aluminum, iron, copper, chromium or the like, or a coating of the metal oxide. Metal sheets with layers are preferred.

The layer thickness of these supports varies depending on the material of the support used, etc., but is generally 80 μm to 1000 μm, and more preferably 80 μm to 500 μm from the viewpoint of handling.
Is.

The surface of these supports may be a smooth surface or may be a matte surface for the purpose of improving the adhesiveness with 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 adhesiveness with the stimulable phosphor layer.

In the radiation image conversion panel of the present invention, a protective layer for physically or chemically protecting the stimulable phosphor layer is generally provided on the surface on which the stimulable phosphor layer is exposed. preferable. This protective layer may be formed by directly coating the protective layer coating solution on the stimulable phosphor layer, or by forming a protective layer separately formed in advance on the stimulable phosphor layer. Good. Materials for the protective layer include cellulose acetate, nitrocellulose, polymethylmethacrylate, polyvinyl butyral, polyvinyl formal, polycarbonate, polyester, polyethylene terephthalate, polyethylene, polypropylene, polyvinylidene chloride, nylon, polytetrafluoroethylene, and polytrifluoride. Materials for the protective layer such as ethylene chloride, tetrafluoroethylene-hexafluoropropylene copolymer, vinylidene chloride-vinyl chloride copolymer and vinylidene chloride-acrylonitrile copolymer are used.

The radiation image conversion panel of the present invention provides excellent sharpness and sensitivity when used in the radiation image conversion method schematically shown in FIG. That is, in FIG. 1, 11 is a radiation generator, 12 is a subject, 13 is a radiation image conversion panel of the present invention, 14 is a stimulated excitation light source, and 15 is a stimulated emission emitted from the radiation image conversion panel. Photoelectric conversion device,
16 is a device for reproducing the signal detected in 15 as an image, 17
Is a device for displaying a reproduced image, and 18 is a filter for separating stimulated excitation and stimulated emission and transmitting only stimulated emission. It should be noted that the following 15 is not limited to the above as long as the optical information from 13 can be reproduced as an image in some form.

As shown in FIG. 1, the radiation from the radiation generator 11 passes through the subject 12 and the radiation image conversion panel 13 of the present invention.
Incident on. The incident radiation is absorbed by the stimulable phosphor layer of the radiation image conversion panel 13, the energy is accumulated, and an accumulated image of a radiation transmission image is formed. Next, this accumulated image is excited by stimulated excitation light from the stimulated excitation light source 14 and emitted as stimulated emission.

Since the intensity of stimulated luminescence emitted is proportional to the amount of accumulated radiation energy, this optical signal is photoelectrically converted by the photoelectric conversion device 15 such as a photomultiplier tube, and displayed by the image display device 17. The radiation transmission image of the subject can be observed.

(Example) Next, the present invention will be described with reference to an example.

Example The following components were mixed and dispersed by a sand mill to prepare a stimulable phosphor layer coating liquid.

: Coating liquid formulation: RbBr: 0.0002Tl phosphor 64.9% by weight γ-glycidoxypropyltrimethoxysilane 0.6 〃 polyvinyl butyral (Sekisui Chemical's S-REC BMS and S-REC BLS mixed at a weight ratio of 7: 3) 4.1 〃 Stearic acid 0.5 〃 Acetic acid-n-butyl 22.4 〃 n-Butanol 7.5 〃 The above coating solution was applied onto a 250 μm thick polyethylene terephthalate film using a doctor blade, dried at 40 ° C, and dried to a thickness of about 300 μm. The radiation image conversion panel A of the present invention having the exhaustible phosphor layer was produced.

The panel A of the present invention thus obtained was left in a drying box for 2 days to remove water, and then evaluated as described below.

After the X-ray tube voltage 80 KV _P in panel A of the present invention is 10mR irradiated, causing bright尽励a semiconductor laser light (wavelength 780 nm), the optical detector stimulated emission emitted from the stimulable phosphor layer ( Photoelectric conversion was performed with a photomultiplier tube, and the sensitivity to X-rays was examined from the magnitude of this signal. Here, the time from X-ray irradiation to semiconductor laser light irradiation was changed to 5 seconds and 2 minutes, and the sensitivity was measured. The former result is represented by S ₀ (5 sec) and the latter result is represented by S ₀ (2 min). Then the panel A 40 ° C., the sensitivity of the 48-hour standing sensitivity again after 5 seconds after forced deterioration and after 2 minutes in a constant temperature and humidity bath of RH 80% was measured, S ₁ that value, respectively (5 sec) and S ₁ (2 min).

S ₀ (5 sec), S ₁ (5 sec) / S ₀ (5 sec) and [S
₁ (2 min) / S ₁ (5 sec)] / [S ₀ (2 min) / S
The value of ₀ (5 sec)] is shown in Table 1. Where S ₁ (5se
c) / S ₀ (5 sec) and [S ₁ (2 min) / S ₁ (5se
c)] / [S ₀ (2 min) / S ₀ (5 sec)] is a value that is an index of sensitivity deterioration after forced deterioration and an index of increase in latent image fading speed, respectively. In Table 1, S ₀ (5se
c) is shown as a relative value with panel A of the present invention as 100.

On the other hand, the panel A of the present invention was repeatedly used 200 times in the cycle of [radiation image capturing → excitation light scanning (reading) → remaining energy elimination] and [radiation image capturing → ... Almost no scratch and abrasion were observed on the surface of the stimulable phosphor layer of panel A after repeated use, and no deterioration was found in the radiation image obtained from panel A after repeated use.

Comparative Example In the example, the work of mixing and dispersing was performed in the same manner as the example except that the addition of γ-glycidoxypropyltrimethoxysilane was omitted, and the obtained coating liquid was applied and dried by the same method as the example. Then, a comparative panel B was manufactured.

The comparative panel B thus obtained was subjected to a forced deterioration test in the same manner as in the example, and the results are also shown in Table 1.

Further, when the comparative panel B was repeatedly used in the same manner as in the example, scratches and abrasion were generated on the surface of the stimulable phosphor layer of the panel B, and the influence of the scratches and abrasion on the quality of the obtained radiation image. Deterioration was found.

As is apparent from Table 1, the panel A of the present invention containing γ-glycidoxypropyltrimethoxysilane, that is, the silane coupling agent, was subjected to forced deterioration as compared with the comparative panel B containing no silane coupling agent. Even after that, the degree of sensitivity deterioration and the degree of increase in latent image fading speed are small. That is, the moisture absorption of the stimulable phosphor layer is suppressed.

In addition, the panel A of the present invention is significantly less affected by scratches and abrasion of the surface of the stimulable phosphor layer caused by mechanical contact with the panel transport system, etc., compared to the comparative panel B, and the stimulability is improved. It is apparent that the physical strength of the phosphor layer is excellent.

(Effect of the Invention) The addition of the silane coupling agent in the present invention to the stimulable phosphor layer is performed on the stimulable phosphor layer; To give moisture resistance, 2. increase the physical strength, 3. increase the dispersibility of the phosphor particles, It has four important effects such as strengthening the adhesiveness with other layers, and these four effects are added to each other or synergistically with each other, and have many excellent effects on the radiation image conversion panel. Grant characteristics.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining a radiation image conversion method using the radiation image conversion panel of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumio Shimada, No. 1 Sakura-cho, Hino-shi, Tokyo Konishi Roku Photo Co., Ltd. Judge Tamura (56) Reference JP 62-177500 (JP, A)

Claims (1)

[Claims] 1. A radiation image conversion panel having a stimulable phosphor layer obtained by dispersing a stimulable phosphor in a binder.
A radiation image conversion panel comprising a silane coupling agent in the stimulable phosphor layer.