JP2992831B2 - Namufacture of radiation image conversion panel - Google Patents

Abstract

PURPOSE:To prevent a stimulable phosphor from deteriorating and to improve setting performance, moisture resistance, and durability by forming an air vent for a sealed space in a protection layer body and/or support, and then sealing the air vent after the panel is dried. CONSTITUTION:A stimulable layer 1 is formed on the protection layer body 2 and/or support 3 and then a spacer 5 is provided between the support 3 and protection layer body 2 while surrounding the stimulable layer 1. Then the air vent 6 is at least one position of the protection layer body 2 and/or support 3 where stimulated light is read out of the stimulable layer 1 without any trouble. Further, the moisture permeability of the spacer 5 and the contact parts between the spacer 5, and support 3 and protection layer body 2 is determined so that the stimulable layer 1 does not deteriorate with external entering water. The air vent 6 is sealed with a sealing member 7 immediately after the panel is heated and dried. Thus, the stimulable layer 1 from which water is removed is held dry to guarantee the setting performance of the panel.

Description

Description: FIELD OF THE INVENTION The present invention relates to a method for manufacturing a radiation image conversion panel having a stimulable phosphor layer, and more specifically, to prevent the intrusion of moisture, guarantee the setting performance, and improve the performance. The present invention relates to a method for manufacturing a radiation image conversion panel having good durability.

[Conventional technology]

Instead of the conventional method of obtaining an X-ray image used for diagnosing a disease using a silver halide photosensitive material, an X-ray image conversion method for directly extracting an image from a phosphor layer has been devised.

This method is, for example, a radiation image conversion method disclosed in U.S. Pat. No. 3,859,527 and JP-A-55-12144, using a stimulable phosphor and using visible light or infrared light as stimulating excitation light. A radiation image conversion panel (hereinafter, abbreviated as a conversion panel) having a stimulable phosphor layer (hereinafter, abbreviated as a stimulable layer) is used. A latent image is formed by accumulating radiation energy corresponding to the radiation transmittance of the laser beam, and thereafter, the radiation energy stored in each part is emitted by scanning this photostimulated layer with photostimulated excitation light, and this is converted into light. The image is converted and an image is obtained based on an optical signal based on the intensity of the light.

This final image may be reproduced as a hard copy or reproduced on a CRT.

The conversion panel used in this radiation image conversion method dissipates and releases the stored energy by scanning the stimulating excitation light after accumulating the radiation image information, so that the radiation image can be stored again after scanning, Can be used repeatedly.

Therefore, it is desirable that the conversion panel has a performance that can withstand long-time use or repeated use many times without deteriorating the image quality of the obtained radiation image. For this purpose, the photostimulable layer of the conversion panel needs to be sufficiently protected from external physical or chemical stimuli.

In the conventional conversion panel, in order to solve the above-mentioned problem, a method of providing a protective layer covering the photostimulated layer surface on the support of the conversion panel, sealing the peripheral edge of the conversion panel, and protecting the photostimulated layer is used. I have been.

This protective layer is formed by directly applying a protective layer coating solution on the photostimulable layer, as described in JP-A-59-42500, for example. It is formed by a method of bonding on the exhausted layer.

Also, for sealing the periphery of the conversion panel, for example, a method of immersing only the periphery of the conversion panel in an organic polymer solution, or applying an organic polymer solution to the periphery to form a polymer film and sealing it. A method of sealing the peripheral portion with a sealant and fixing the sealant from the outside with a fixing member
No. 61-237099), and a method of sealing in a state where the peripheral portion is covered with an extended portion of a protective layer (Japanese Patent Application Laid-Open No. 61-237100).

In order to further improve the moisture resistance, a protective layer having a greater moisture-proof effect than the conventional protective layer is used, and a spacer is bonded and sandwiched between the support and the protective layer, surrounding the photostimulable layer. (Japanese Unexamined Patent Publication No. 2-131700) has been proposed, and a method of improving the moisture-proof effect by filling the outside of the spacer with a filler also serving as a moisture-proof material has been proposed (Japanese Patent Laid-Open No. 2-77700).

[Problem to be solved]

However, such prior art conversion panels,
When used in a normal atmosphere, it is possible to prevent intrusion of moisture from outside, but when used under severe temperature and humidity conditions or when using a phosphor that is sensitive to moisture, external Deterioration of the phosphor due to penetration of moisture has been a problem.

Also, even if a protective layer is provided on the stimulable layer and the periphery of the conversion panel is sealed, the stimulable phosphor absorbs moisture during the process of manufacturing the conversion panel, and the set quality characteristics of the conversion panel are lost and reproduced. A problem arises in guaranteeing good setting performance. Further, since the degree of the moisture absorption largely depends on the atmosphere of the manufacturing process,
There is a problem that the characteristics of each conversion panel vary greatly and quality reliability is lost.

However, on the other hand, the method using the thick protective layer body is a technique suitable for providing a low-refractive-index layer such as a vacuum layer between the stimulating layer and the protective layer, and providing a conversion panel with high sharpness. It is thought that an improved conversion panel can provide an excellent conversion panel.

[Object of the invention]

In view of the above technical problems, the present invention has the following objects: (1) to prevent deterioration due to intrusion of moisture into the stimulable phosphor, to have a good setting performance, and (2) to have good moisture resistance and durability. In providing conversion panels.

[Means for solving the problem]

The present invention comprises a support, a stimulable phosphor layer and a protective layer, wherein a spacer surrounding the periphery of the stimulable phosphor layer is provided between the support and the protective layer to provide the stimulable phosphor. In a method of manufacturing a radiation image conversion panel for closing a body layer, a radiation image of a closed space including the protective layer, the support, and a spacer is provided in at least one portion of the protective layer and / or the support. After drying the conversion panel, the ventilation holes are sealed with a sealing member.

The configuration of the conversion panel manufactured according to the present invention includes:
The support and the protective layer are sandwiched between the photostimulable layer, and a spacer is provided around the periphery of the photostimulable layer. The photostimulable layer may be bonded to the support or the protective layer,
It is preferable that the photostimulable layer and the protective layer are not in contact with each other, and it is more preferable that a low refractive index layer is present between the photostimulable layer and the protective layer.

FIG. 1 and FIG. 2 schematically show an example of a conversion panel in which ventilation holes are provided in a protective layer body.
Reference numeral 2 denotes a protective layer body, 3 denotes a support, 4 denotes a low refractive index layer, 5 denotes a spacer, 6 denotes a vent, and 7 denotes a sealing member that covers and seals the vent. This type has very good workability.

In the above-described embodiment, at least one vent hole is formed in a portion of the protective layer and / or the support which does not hinder reading of the photostimulable light from the photostimulable layer. Preferably, it is one or two places.

The cross-sectional area of the ventilation hole is preferably 0.25 to 1.5 cm ² for 100 cm ³ of the closed space. If the total cross section of the ventilation holes is too large, it is not preferable in terms of the structural strength of the conversion panel.

The minimum distance from the periphery of the ventilation hole to the periphery of the sealing member, that is, the distance of moisture permeation at the bonding interface when outside air enters the closed space is 1c.
m is enough. The shape of the adhesive surface of the sealing member covering the air hole and the shape of the peripheral surface of the air hole with respect to this are not necessarily limited to flat surfaces, but may be any conjugate surfaces.

The material of the sealing member is not particularly limited as long as it can hold the photostimulable layer in a state of being shielded from the external atmosphere, and glass, ceramics, metal, plastic, and the like can be used. It is preferable to select the material according to the material, and it is more preferable that the material is the same.
Further, its moisture permeability is determined by a cup method (JIS Z0208), and its value is preferably 30 g / m ² · 24 hr or less. If the moisture permeability is higher than this, it is not preferable because the stimulable phosphor deteriorates due to moisture entering from the outside.

As the moisture-proof adhesive used for sealing the sealing member, a two-component urethane-based adhesive, a two-component modified acrylate-based adhesive,
A resin that cures by polycondensation or cross-linking reaction by mixing two components such as a two-component modified acrylic adhesive or a two-component epoxy adhesive, or an X-ray, α-ray, β-ray, γ-ray, Irradiation with electromagnetic waves or particle beams, such as energy neutrons, electron beams, and ultraviolet rays, absorbs the energy of the electromagnetic waves or particle beams to cure the resin.

Heat drying is carried out at 40 to 100 ° C. for 0.1 to 3 hours, and is preferably performed under reduced pressure because the dehumidifying effect is high.

Immediately after heating and drying, the air holes are sealed and sealed. After drying, it is more preferable to replace the air in the closed space with a dry gas, for example, an N ₂ gas having a water content of 50 ppm or less, preferably 20 ppm or less, because the set performance of the conversion panel can be maintained. In addition, it is preferable that the sealing and sealing of the air holes be performed in a dry gas atmosphere, because the intrusion of moisture from the air holes can be prevented.

As the protective layer body used in the present invention, a protective layer body having a good light-transmitting property and capable of being formed into a sheet shape is used. In order to transmit the stimulated excitation light and the stimulated emission efficiently, the protective layer preferably has a high light transmittance in a wide wavelength range, and the light transmittance is preferably 80% or more. For example, sheet glass such as quartz, borosilicate glass, chemically strengthened glass, PET,
Organic polymer compounds such as stretched polypropylene and polyvinyl chloride are exemplified. Borosilicate glass shows a light transmittance of 80% or more in the wavelength range of 330 nm to 2.6 μm, and quartz glass shows a high light transmittance even at a shorter wavelength.

Further, it is preferable to provide an anti-reflection layer such as MgF _{2 on} the surface of the protective layer body, because it has an effect of efficiently transmitting the stimulating light and the stimulating light and also has the effect of reducing the decrease in sharpness.

The thickness of the protective layer is 50 μm to 5 mm, and preferably 100 μm to 3 mm in order to obtain good moisture proofness.

The water vapor transmission rate is preferably 30 g / m ² · 24 hr or less by a cup method. If the moisture permeability is higher than this, it is not preferable because the stimulable phosphor deteriorates due to moisture entering from the outside.

Examples of the support used in the present invention include various polymer materials, glass, ceramics, and metals.

Examples of the polymer material include films of cellulose acetate film, polyester film, polyethylene terephthalate, polyamide, polyimide, triacetate, polycarbonate and the like. Examples of the metal include a metal sheet or metal plate of aluminum, iron, copper, chromium, or the like, or a metal sheet or metal plate having a coating layer of the metal oxide. Examples of the glass include chemically strengthened glass and crystallized glass. Examples of the ceramic include a sintered plate of alumina or zirconia.

Further, the layer thickness of these supports varies depending on the material of the support to be used and the like, but is generally 80 μm to 5 mm, and is preferably 200 μm from the viewpoint of easy handling and obtaining good moisture-proof properties. ~ 3mm. Further, the moisture permeability is preferably 30 g / m ² · 24 hr or less by a cup method.

The surface of the support may be a smooth surface or a mat surface for the purpose of improving the adhesion to the stimulable phosphor layer. Also, the surface of the support may be an uneven surface,
A surface structure in which minute tile plates independent of each other are densely arranged may be used.

Further, on these supports, an undercoat layer may be provided on the surface on which the stimulable layer is provided for the purpose of improving the adhesiveness with the stimulable layer, and if necessary, a light reflecting layer and a light absorbing layer may be provided. May be provided.

After forming the photostimulable layer on the support or the protective layer, a spacer is provided between the support and the protective layer to surround the photostimulable layer. There is no particular limitation as long as it can be held in a state of being shielded from the atmosphere, and glass, ceramics, metal,
Plastic or the like can be used.

The spacer preferably has a moisture permeability of 30 g / m ² · 24 hr or less. If the moisture permeability is higher than this, it is not preferable because the stimulable phosphor deteriorates due to moisture entering from the outside.

The thickness of the spacer is preferably not less than the thickness of the stimulating layer and not more than 5 mm. The width of the spacer is determined mainly in relation to the moisture-proof property (above-mentioned moisture permeability) of the contact portion between the spacer, the support and the protective layer, and is preferably 1 to 30 mm. If the width of the spacer is too small, it is not preferable from the viewpoints of the stability, strength, and moisture resistance of the spacer. If the size is too large, the size of the conversion panel becomes unnecessarily large, which is not preferable.

The moisture permeability of the spacer and the contact portion between the spacer and the support and the protective layer is preferably 30 g / m ² · 24 hr or less. The material of the spacer is preferably the same as the material of the support. The spacer is required to be in close contact with the support and the protective layer in order to impart moisture-proof properties to the conversion panel and to keep the thickness of the low refractive index layer constant.
Here, for example, an adhesive or the like is used for bringing the spacer into close contact with the support and the protective layer, and the adhesive is preferably one having moisture resistance. Specifically, epoxy resin, phenolic resin, cyanoacrylate resin,
Organic polymer adhesives such as vinyl acetate resin, vinyl chloride resin, urethane resin, acrylic resin, ethylene vinyl acetate resin, olefin resin, chloroprene rubber, nitrile rubber, and silicone adhesive, An inorganic adhesive mainly containing alumina, silica or the like can be used. Further, a moisture-proof adhesive used for sealing the sealing member may be used. Among these, epoxy resins and silicone resins used for encapsulating semiconductors and electronic components are preferable because of their excellent moisture resistance, and epoxy adhesives are particularly suitable because they have low moisture permeability.

In order to improve the adhesion of the spacer and the support or the contact portion between the spacer and the protective layer, an undercoat layer may be provided on the contact surface of the spacer, the support and the protective layer with the other layer, or a rough layer may be provided. Surface treatment can also be performed.

In the conversion panel manufactured according to the present invention, it is preferable to have a low refractive index layer between the photostimulable layer and the protective layer, since the sharpness reduction due to the protective layer is suppressed.

This low-refractive-index layer exists in a state where it is shielded from the external atmosphere by the spacer. By providing the low-refractive-index layer in this manner, the thickness of the protective layer body can be made substantially thicker. In addition to the need for a protective layer having a thickness that can withstand the external air pressure, the provision of a low refractive index layer further improves the moisture resistance and durability of the conversion panel.

Examples of such a low refractive index layer include a layer made of an inert gas such as air, nitrogen, and argon, and a layer having a refractive index of substantially 1 such as a vacuum layer; ethanol (refractive index: 1.36), methanol (refractive index). 1.33) and diethyl ether (refractive index)
It can also be a layer composed of a liquid such as 1.35). In order to obtain a working effect of a low refractive index, for example, CaF ₂ (refractive index: 1.23 to 1.26), Na ₃ AlF ₆ (refractive index: 1.35), MgF ₂ (refractive index: 1.38), SiO ₂ (refractive index) 1.46) can be provided.

The low-refractive-index layer of the conversion panel according to the present invention is preferably a gas layer or a vacuum layer because of its high effect of preventing sharpness from decreasing.

The thickness of the low refractive index layer is practically 0.05 μm to 3 mm.

In order to sufficiently impart the effect of reducing the sharpness reduction to the low refractive index layer, the low refractive index layer needs to be in close contact with the stimulable layer, In the case of a layer and a vacuum layer or a liquid layer, a close contact state is realized as it is, but the low refractive index layer is formed of the above CaF ₂ , Na ₃ AlF ₆ , MgF
₂ , when formed on the surface of the protective layer body with SiO ₂ or the like, the stimulable layer and the low-refractive-index layer are brought into close contact with each other by, for example, an adhesive. In this case, the refractive index of the adhesive is preferably close to the refractive index of the photostimulable layer.

The stimulable phosphor used in the present invention, after being exposed to the first light or high-energy radiation,
Stimulation such as thermal, mechanical, chemical or electrical (stimulated excitation)
Is a phosphor that emits stimulable light corresponding to the dose of the first light or high-energy radiation. However, from a practical point of view, it is preferably a phosphor that emits stimulable light by excitation light of 500 nm or more. Examples of such a stimulable phosphor include BaSO ₄ : A described in JP-A-48-80487.
X, SrSO are described in _{JP-A-48-80489 4: AX, Li 2 B} 4 O 7 of JP 53-39277; Cu, Ag, etc., in JP 54-47883 Li ₂ O・ (B ₂ O ₂ ) x: Cu and Li ₂ O ・ (B ₂ O ₂ ) x: Cu, Ag, etc.
U.S. Pat.No. 3,859,527 SrS: Ce, Sm, SrS: Eu, Sm, La ₂ O ₂ S:
Phosphors represented by Eu, Sm and (Zn, Cd) S: Mn.

Further, ZnS: Cu, Pb described in JP-A-55-12142
Phosphor, the general formula BaO · xAl ₂ O _3: barium aluminate phosphor represented by Eu, and the general formula M ^II O · xSiO _2: alkaline earth metal silicate phosphor represented by A are exemplified. Further, an alkaline earth fluoride halide represented by the general formula (Ba1 _- x _- yMgxCay) FX: eEu2 ^{+ described} in JP-A-55-12143 is disclosed in JP-A-55-12144. the listed formulas LnOX: phosphor represented by xA, the general formulas described in ^{_{JP-a-55-12145 (Ba 1- xM II x)}} FX: phosphor represented by yA, JP 55 -84389, a phosphor represented by the general formula BaFX: xCe, yA, and a rare earth element activated 2 represented by a general formula M ^II FX.xA: yLn described in JP-A-55-160078. Valence metal fluorohalide phosphor, general formula ZnS: A, CdS: A, (Zn, Cd) S: A, S: A, ZnS: A, X
And a phosphor represented by CdS: A, X, and any one of the following general formulas xM ₃ (PO ₄ ) ₂ .NX ₂ : yAM ₃ (PO ₄ ) ₂ : described in JP-A-59-38278. phosphor represented by yA, following which are described in JP-a-59-155487 any of formulas _{nReX 3 · mAX '2: xEu} nReX 3 · mAX' 2: xEu, phosphor represented by YSM, especially HirakiAkira following general formula are described in JP ^{61-72087 M I X · aM II X} '2 · bM III X "3:. alkali halide phosphor, etc. represented by cA can be mentioned in particular alkali halide phosphor, It is preferable because a photostimulable layer can be easily formed by a method such as vapor deposition or sputtering.

In addition, alkaline earth fluorohalide phosphors and alkali halide phosphors are particularly remarkably deteriorated by moisture, and the effect of the present invention is great.

However, the stimulable phosphor used in the present invention is:
The phosphor is not limited to the above-described phosphor, and any phosphor may be used as long as it emits stimulating light when irradiated with stimulating excitation light after irradiation with radiation.

In the method of the present invention, the stimulable phosphor layer comprises:
It is formed on a support or a protective layer by a coating method, a vapor deposition method, or the like.

Such a photostimulable layer may be a photostimulable layer group comprising one or more photostimulable layers containing at least one of the aforementioned photostimulable phosphors. Further, the stimulable phosphor contained in each stimulable layer may be the same or different.

The thickness of the stimulable layer of the conversion panel varies depending on the sensitivity of the intended conversion panel to radiation, the type of stimulable phosphor, etc., but when no binder is contained, a range of 10 μm to 1000 μm, preferably 20 μm to Selected from the range of 800 μm,
When it contains a binder, it is selected from the range of 20 μm to 1000 μm, preferably the range of 50 μm to 500 μm.

The conversion panel manufactured according to the present invention is used in a radiation image conversion method schematically shown in FIG.

That is, the radiation from the radiation generator 41
The light enters the conversion panel 43 through 42.

This incident radiation is absorbed by the photostimulable layer of panel 43,
The energy is accumulated, and an accumulation image of the radiation transmission image is formed.

Next, the accumulated image is excited by the stimulating light from the stimulating light source 44, and the intensity of the stimulating light is proportional to the amount of accumulated radiation energy. By performing the photoelectric conversion by the conversion device 45, reproducing the image by the image reproduction device 46, and displaying the image by the image display device 47, the radiation transmission image of the subject can be observed.

When the conversion panel is manufactured by the method of the present invention, the stimulable layer from which moisture has been removed by heating and drying can be kept in a dry state, so that the setting performance of the conversion panel can be guaranteed.

〔Example〕

 Next, the present invention will be described with reference to examples.

Example 1 A crystallized glass support (400 mm × 500 mm) having a thickness of 1 mm was set in a vapor deposition apparatus by an electron beam method (EB method). Next, an alkali halide phosphor (RbBr; 0.0006T1) was put into a water-cooled crucible and pressed to form a crucible.

Subsequently, the inside of the vapor deposition apparatus was evacuated to a vacuum degree of 5 × 10 ⁻⁶ Torr. Next, while maintaining the support at 80 to 100 ° C., the EB
Power was supplied to the gun to evaporate the stimulable phosphor.

In order to obtain the desired photostimulable layer, the deposition rate was controlled by a film thickness monitor so as to be 10 ⁴ l / min. The electron beam scanned the stimulable phosphor surface of the crucible in a raster shape.

The vapor deposition was terminated when the thickness of the photostimulable layer reached 300 μm.

First, a glass spacer having a thickness of 700 μm and a width of 5 mm is provided on the first layer so that an air layer having a thickness of 400 μm is provided on the photostimulated layer.
They were arranged as shown in the figure. The spacer and the support were adhered with an epoxy resin adhesive (AV-138, manufactured by Ciba-Geigy).

Next, a protective layer of glass having a thickness of 1 mm provided with a ventilation hole of 10 mm square was placed on the spacer, and a portion where the spacer and the protective layer were in contact was adhered to each other with the epoxy resin adhesive.

This was dried by heating at 80 ° C. for 2 hours under a reduced pressure of 1 × 10 ⁻² mmHg, and then replaced with dry N ₂ gas having a water content of 20 ppm, and the air holes were immediately formed in the same glass plate as the protective layer (30 mm × 30 mm). ) And sealed with the above epoxy resin adhesive and sealed,
A conversion panel similar to FIG. 1 was manufactured. The moisture-proof adhesive used for sealing is as shown in Table 1.

With respect to the radiation image conversion panel thus obtained, the conversion panel was forcibly deteriorated by standing at 45 ° C. and 85% RH for 60 days, and the sensitivity reduction rate and the fading reduction rate were evaluated.

Further, when the stimulable layer on the support is sealed and sealed (sealed) with a protective layer body and a spacer to produce a conversion panel according to the present invention, the rate of decrease in sensitivity and the rate of decrease in fading before and after sealing are determined. Investigation was made to evaluate the performance degradation during the production of the conversion panel. In addition, the performance of the plate before sealing was evaluated in a vacuum and used as a reference in order to remove the influence of moisture.

Examples 2 to 7 The types and thicknesses of the protective layer of the conversion panel, the size of the ventilation holes, the type of sealing member, the thickness, the size, and the moisture-proof adhesive used for sealing are shown in Table 1. A conversion panel was manufactured in the same manner as in Example 1 except that the conversion panel was performed.

Comparative Example (1) A conversion panel was obtained in the same manner as in Example 1, except that 1 mm-thick borosilicate glass having no ventilation hole was used for the protective layer.

Comparative Example (2) The protective layer and the sealing member were made of polyethylene terephthalate having a thickness of 0.01 mm, and the sealing member was adhered using a vinyl chloride-vinyl acetate copolymer. In the same manner as in Example 1, a conversion panel was obtained.

Comparative Example (3) A conversion panel was obtained in the same manner as in Example 1 except that a 15 mm square borosilicate glass was used for the sealing member.

Comparative Example (4) After drying by heating at 10 ^-2 mmHg at 80 ° C for 2 hours, the water content was 80 ppm.
It is the same as Example 1 except that the dry N ₂ gas was replaced.

For evaluation, the number of repeated experiments on the sample was n = 100, and the averaged results are shown in Table-1.

Sensitivity reduction rate: P Irradiate 10mR of X-ray with 80KVp tube voltage, and after t seconds, stimulate excitation by semiconductor laser light (780nm, 20mW), and detect photostimulated emission emitted from photostimulated layer by photodetector The magnitude of the obtained electric signal is converted to the sensitivity Sst of the conversion panel.
(Sec).

Five seconds after X-ray irradiation, the sensitivity S ₀ ( ₅ sec) of the conversion panel before sealing, the sensitivity Sst ( ₅ sec) of the conversion panel before and after the forced degradation test after sealing, and the conversion panel after the forced degradation test From the sensitivity S ₆₀ ( ₅ sec), the sensitivity reduction rate (P) was determined by the following equation.

Fading reduction rate: Q The decay rate of the stored energy between the irradiation of the X-rays and the reading of the signal with the laser beam, that is, the fading: F, can be obtained by the following equation.

Here, S ( ₁₂₀ sec) represents the sensitivity 120 seconds after the X-ray irradiation, and S ( ₅ sec) represents the sensitivity 5 seconds after the X-ray irradiation.

From the fading F ₀ of the conversion panel before sealing, the fading Fst before the forced deterioration test after sealing, and the fading F ₆₀ after the forced deterioration test, the fading reduction rate (Q) was determined by the following equation.

[Effects of the invention] From Table 1, it can be seen that the conversion panels manufactured by the method of the present invention of Examples 1 to 7 can almost completely prevent the penetration of moisture at the time of production, so that the sensitivity and the fading due to moisture are obtained. The performance (setting performance) at the time of manufacturing the conversion panel, in which the deterioration of the characteristics was extremely small, was sufficiently maintained. Also, high temperature,
The set performance was maintained for a long period of time even under high humidity, and it had excellent durability.

[Brief description of the drawings]

1 and 2 are explanatory views of an embodiment of the radiation image conversion panel of the present invention, and FIG. 2 is a perspective plan view of FIG. FIG. 3 is an explanatory diagram of a radiation image conversion method using a radiation image conversion panel. DESCRIPTION OF SYMBOLS 1 ... Stimulation layer 2 ... Protective layer 3 ... Support 4 ... Low refractive index layer 5 ... Spacer 6 ... Vent hole 7 ... Sealing member 41 ... Radiation generator 42 ... Subject 43 … Radiation image conversion panel 44… Stimulated excitation light source 45… Photoelectric conversion device 46… Radiation image reproducing device 47… Radiation image display device 48… Filter

Claims (1)

(57) [Claims] 1. A photostimulable phosphor comprising a support, a stimulable phosphor layer and a protective layer, wherein a spacer surrounding the periphery of the stimulable phosphor layer is provided between the support and the protective layer. In a method for manufacturing a radiation image conversion panel that seals a phosphor layer, at least one place of the protective layer and / or the support is provided with a ventilation hole of a sealed space including the protective layer, the support and a spacer, A method for manufacturing a radiation image conversion panel, comprising drying the radiation image conversion panel and sealing the ventilation hole with a sealing member.