JPH0321899A - Production of radiation sensitizing screen - Google Patents

Abstract

PURPOSE:To lower voids by forming a phosphor layer consisting of a phosphor and a thermoplastic elastomer in which >=10wt.% and <=100wt.% of the component has <=150 deg.C softening temp. on a supporting body and compressing the same at the softening temp. of the thermoplastic elastomer. CONSTITUTION:For example, the phosphor of a tungstate system is used as the phosphor for radiation sensitization and the thermoplastic elastomer having 30 to 150 deg.C softening temp. or m.p. is used for the binder. For example, the thermoplastic elastomer of a polystyrene system is used for the thermoplastic elastomer. The component ratio of the thermoplastic elastomer in the binder is specified to >=10wt.% and <=100wt.%. For example, lower alcohol, such as methanol, is used as a solvent for preparing a coating liquid. The phosphor layer and phosphor sheet formed by directly applying the coating liquid on the supporting body are adhered onto the supporting body to form the phosphor. The phosphor layer formed in such a manner is subjected to the compression treatment. The compression is executed at the temp. above the softening temp. or melting temp. of the thermoplastic elastomer in the binder.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing radiation intensifying screens.

[Technical Background of the Invention and Prior Art] Radiation intensifying screens are used in various fields such as medical radiography such as xH radiography for the purpose of medical diagnosis, and industrial radiography for the purpose of non-destructive testing of materials. In radiography, in order to improve the sensitivity of the imaging system, it is used by superimposing it on one or both sides of a radiographic film such as an X-ray film.

This radiation intensifying screen basically consists of a support and a phosphor layer formed on one side of the support. Note that a transparent protective film is generally provided on the surface of the phosphor layer opposite to the support (the surface not facing the support) to protect the phosphor layer from chemical deterioration or Protects from physical impact.

The phosphor layer is composed of a binder containing and supporting phosphor particles in a dispersed state. The phosphor layer is generally attached onto the support using a coating method under normal pressure as described below. That is, a coating solution is prepared by mixing and dispersing phosphor particles and a binder in an appropriate solvent, and this coating solution is subjected to radiation sensitization under normal pressure using a coating means such as a doctor blade, roll coater, or knife coater. Either by directly coating the screen support and then removing the solvent from the coating film, or by applying the coating solution in advance on a temporary support such as a glass plate under normal pressure and then removing the solvent from the coating film. The phosphor layer is attached to the support by forming a phosphor-containing resin thin film, peeling it from the temporary support, and bonding it to the support of the radiation intensifying screen.

The phosphor in the phosphor layer has the property of emitting high-intensity light when excited by radiation such as Xi.

Therefore, the phosphor emits high-intensity light depending on the amount of radiation that passes through the subject, and the radiographic film placed in contact with the surface of the phosphor layer of the radiation-sensitizing screen is sensitive to this phosphor. Since exposure is also caused by body luminescence, sufficient exposure of photographic film can be achieved with a relatively small dose of radiation.

It is desired that a radiation intensifying screen having the basic structure as described above has high sensitivity and provides an image with good image quality (sharpness, granularity, etc.).

The sensitivity of a radiation intensifying screen basically depends on the total amount of light emitted by the phosphors contained in the panel. It also depends on the content of A high content of phosphor also means high absorption of radiation such as X-rays, resulting in higher sensitivity and at the same time improved image quality (particularly graininess). On the other hand, when the content of phosphor in the phosphor layer is constant, the more densely packed the phosphor particles are, the thinner the layer thickness can be, which reduces the spread of emitted light due to scattering. It is possible to obtain relatively high sharpness.

The present applicant has developed a radiation intensifying screen that has a phosphor layer densely packed with phosphors, in which the porosity of the phosphor layer is reduced by compressing the phosphor layer. and its manufacturing method have already been applied for (Japanese Patent Application No. 149069/1983;
No. 070). The above-mentioned radiation-sensitizing screen had a phosphor layer that was subjected to compression treatment to increase the density of the phosphor in the phosphor layer compared to previous radiation-sensitizing screens. As a result, this radiation-sensitized screen has excellent sharpness, but on the other hand, the phosphor is partially destroyed by the compression process, so it may actually deteriorate in terms of graininess. There was a problem.

[Summary of the Invention] An object of the present invention is to provide a method for manufacturing a radiation intensifying screen that can reduce the porosity in a phosphor layer without destroying the phosphor.

Another object of the present invention is to provide a method for producing a radiation-sensitizing screen that can produce a radiation-sensitizing screen that has excellent sharpness and graininess.

The above object is to provide a fluorescent material of the present invention comprising: a) a phosphor and a binder in which 10% by weight or more and 100% by weight of the components is a thermoplastic elastomer with a softening temperature or melting point of 30"C or more and 150"C or less; manufacturing a radiation-sensitizing screen comprising the steps of: forming a body layer on a support; b) compressing the Fuji phosphor layer at a temperature equal to or higher than the softening temperature or melting point of the thermoplastic elastomer. and a) a step of forming a phosphor sheet consisting of a phosphor and a binder in which 10% by weight or more and 100% by weight or less of the components is a thermoplastic elastomer with a softening temperature or melting point of 30° C. or more and 150° C. or less. , b) compressing the phosphor sheet at a temperature equal to or higher than the softening temperature or melting point of the thermoplastic elastomer, and C) attaching the compressed phosphor sheet onto a support. This can be achieved by a method of manufacturing a radiation intensifying screen.

In the present invention, 10% by weight or more and 100% by weight or less of the binder component contained in the phosphor layer or phosphor sheet contains thermoplastic material that has elasticity at room temperature and becomes fluid when heated. Since an elastomer is used and the phosphor layer (phosphor sheet) is compressed at a temperature higher than the softening temperature or melting point of the thermoplastic elastomer, damage to the phosphor due to compression can be reduced.

In other words, during compression, phosphor crystals dispersed in a binder heated to a temperature above the softening or melting point are subjected to pressure with a certain degree of freedom, so the phosphor crystals are Can be oriented without damage.

Preferred embodiments of the present invention are listed below.

(1) The thermoplastic elastomer is a polystyrene thermoplastic elastomer, a polyolefin thermoplastic elastomer, a polyurethane thermoplastic elastomer, a polyester thermoplastic elastomer, a polyamide thermoplastic elastomer, a polybutadiene thermoplastic elastomer, or an ethylene vinyl acetate thermoplastic elastomer. Elastomer, polyvinyl chloride thermoplastic elastomer, natural rubber thermoplastic elastomer, fluororubber thermoplastic elastomer, polyisoprene thermoplastic elastomer-chlorinated polyethylene thermoplastic elastomer, styrene-butadiene rubber thermoplastic elastomer, and silicone A method for producing a radiation intensifying screen, characterized in that the screen is at least one thermoplastic elastomer selected from the group consisting of rubber-based thermoplastic elastomers.

(2) A method for producing a radiation intensifying screen, characterized in that the binder is a 100% by weight thermoplastic elastomer.

(3) A method for producing a radiation intensifying screen, characterized in that the compression step is carried out using a calendar roll.

[Structure of the Invention] The method for manufacturing the radiation intensifying screen of the present invention will be described in detail below.

The method for manufacturing the radiation intensifying screen of the present invention involves forming a phosphor layer or a phosphor sheet made of a binder and a phosphor by coating, and applying the coating to the softening temperature or melting point of the thermoplastic elastomer contained in the binder. It consists of compressing at a temperature higher than that.

First, a coating liquid for forming a phosphor layer consisting of a binder, a phosphor, and a solvent is prepared.

The phosphor used in the present invention will be described below.

Examples of radiation-sensitizing phosphors preferably used in the present invention include the following phosphors.

Tungstate-based phosphor (C a W 0 4 ,
MgWO. , CaWO4: Pb, etc.), terbium-activated rare earth oxysulfide-based phosphor [Y2 02 S:
T b, G d 2 02 S: T b %L a
2 0 2 S: T b, (YGd) 2 o2S
:Tb, (y,Gd)2o2S:Tb,Tm, etc.], terbium-activated rare earth phosphate phosphor (YPO4 :Tb
, GdPO4:Tb, LaPO4:Tb, etc.), terbium-activated rare earth oxyhalide phosphor (LaOB
r: Tb, LaOBr: Tb, Tm, LaOCJZ
:Tb, LaOCIl:Tb, Tm, GdOBr :T
b, GdOCl:Tb, etc.), thulium-activated rare earth oxyhalide phosphors (LaOBr:Tm, LaOC
l: Tm, etc.), barium sulfate-based phosphor [BaSO4
: PbVBaS04 : Eu” (BaS r)
So. : Eu2+ etc.], divalent europium activated alkaline earth metal phosphate phosphor [Ba3(PO4)2 :
Eu” (Ba, Sr) 3 (P04) 2 :Eu” Ba, etc.], divalent eurobium-activated alkaline earth metal fluorohalide phosphor [BaFCIt: Eu” Ba
FBr: Eu”BaFC.Q:Eu”, Tb, Ba
FBr: Eu”Tb, BaF2・Back2・κCIL
:Eu"I1aF2- BaCIl.2- xBaso
．． - KCIL: Eu” (Ba, Mg) F2・B
aCj! 2・KCfi:Eu” etc.], iodide-based phosphor (
Csl:Na, Csl:Tfi, Nal, Kl: T1
etc.), sulfide-based phosphors [ZnS: Ag, (Zn, C
d) S:Ag. (Zn.Cd)S:Cu, (Zn,Cd
)S: Cu, AIL, etc.], hafnium phosphate phosphor (HfP20r: Cu, etc.). However, the phosphor used in the present invention is not limited to these, and may be any phosphor that emits light in the visible to near ultraviolet region when irradiated with radiation.

The above-mentioned phosphor and binder are added to a suitable solvent and mixed thoroughly to prepare a coating solution in which the phosphor is uniformly dispersed in the binder solution.

As the binder, 10% by weight or more is a thermoplastic elastomer having a softening temperature or melting point of 30°C to 150°C.

Thermoplastic elastomer has elasticity at room temperature and becomes fluid when heated, so it can prevent damage to the phosphor due to pressure during compression. Examples of thermoplastic elastomers include polystyrene thermoplastic elastomers polyolefin thermoplastic elastomers polyurethane thermoplastic elastomers polyester thermoplastic elastomers polyamide thermoplastic elastomers polybutadiene thermoplastic elastomers ethylene vinyl acetate thermoplastic elastomers, polychlorinated Vinyl thermoplastic elastomer Natural rubber thermoplastic elastomer, fluororubber thermoplastic elastomer, polyisoprene thermoplastic elastomer, chlorinated polyethylene thermoplastic elastomer, styrene-butadiene rubber thermoplastic elastomer, silicone rubber thermoplastic elastomer, etc. can be mentioned.

The effects of the present invention can be obtained if the component ratio of the thermoplastic elastomer in the binder is 10% by weight or more and 100% by weight or less as described above, but the binder should contain as much thermoplastic elastomer as possible, especially 100% by weight. % of thermoplastic elastomer.

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

The mixing ratio of the binder and phosphor in the coating solution varies depending on the characteristics of the intended radiation intensifying screen, the type of phosphor, etc., but in general, the mixing ratio of the binder and phosphor is as follows:
It is selected from the range of 1:1 to 1:100 (weight ratio), and particularly preferably selected from the range of 1:8 to 1:40 (weight ratio).

The coating liquid also contains a dispersant to improve the dispersibility of the phosphor in the coating liquid, and a dispersant to improve the bonding force between the binder and the phosphor in the phosphor layer after formation. Various additives such as plasticizers may be mixed. Examples of dispersants used for such purposes include phthalic acid, stearic acid, cabroic acid, lipophilic surfactants, and the like. 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. and 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.

When forming a phosphor layer directly on a support, a coating solution containing the phosphor and binder prepared as described above,
A coating film of the coating liquid is formed by uniformly coating the surface of the support. This coating operation can be carried out using a conventional coating means such as a doctor blade, roll coater, knife coater, etc.

The coating film thus formed is dried to form a phosphor layer.

The support can be arbitrarily selected from materials known as supports for radiation intensifying screens. Examples of such materials include films of plastic substances such as cellulose acetate, polyester, polyethylene terephthalate, polyamide, polyimide, triacetate, polycarbonate, metal sheets such as aluminum foil, aluminum alloy foil, regular paper, baryta paper, Resin-coated paper, pigment paper containing pigments such as titanium dioxide,
Examples include paper sized with polyvinyl alcohol, and plates or sheets of ceramics such as alumina, zirconia, magnesia, and titania.

In known radiation-sensitizing screens, a phosphor layer is provided in order to strengthen the bond between the support and the phosphor layer, or to improve the sensitivity or image quality (sharpness, granularity) of the radiation-sensitized screen. A polymeric substance such as gelatin is coated on the surface of the side support to form an adhesion-imparting layer, or a light-reflecting layer made of a light-reflecting substance such as titanium dioxide, or a light-reflecting layer made of a pre-absorbing substance such as carbon black. It is known to provide an absorbent layer or the like. The support used in the present invention can also be provided with these various layers, and their configurations can be arbitrarily selected depending on the purpose, use, etc. of the desired radiation intensifying screen.

Furthermore, in order to improve the sharpness of the obtained image, an adhesive layer, a light reflection layer, a light absorption layer, etc. are provided on the surface of the support on the phosphor layer side (the surface of the support on the phosphor layer side). microscopic irregularities may be formed on the surface.

As mentioned above, instead of forming a phosphor layer directly on the support, a phosphor sheet is first formed separately from the support, and then this is placed on the support using an adhesive or the like. Good too.

In this case, the phosphor sheet can be formed by applying a coating liquid for forming a phosphor layer onto a temporary support, drying it, and then peeling it off from the temporary support. Therefore, it is preferable to apply a release agent to the surface of the temporary support in advance to make it easier to peel off the formed phosphor sheet from the temporary support. As the temporary support, the same support as described above is used.

In the manner described above, a phosphor layer or a phosphor sheet made of a phosphor and a binder can be formed.

Next, the compression process will be described.

As described above, a phosphor layer formed by directly applying a coating liquid onto a support or a phosphor layer formed by adhering a phosphor sheet onto a support is subjected to compression treatment. Of course, it is also possible to compress the phosphor sheet alone before adhering it to the support, and then attach the compressed phosphor sheet to the support using an adhesive or the like.

Compression is carried out at a temperature above the softening or melting temperature of the thermoplastic elastomer in the binder.

Examples of compression devices used for the compression treatment of the present invention include commonly known devices such as calender rolls and hot presses. For example, compression treatment using calender rolls is carried out by placing a phosphor sheet on a support and passing it at a constant speed between rollers heated to a temperature higher than the softening temperature or melting point of the binder.

However, the compression device used in the present invention is not limited to these devices, and any device may be used as long as it can compress the sheet as described above while heating it.

The pressure during compression is 50 kg w/cm
Generally, it is 2 or more.

The porosity of the phosphor layer formed on the support as described above can be theoretically determined by the following formula ('I).

Below margin Vair/V= <a+b) px py V A ( aj'y +b
7'x)V[(a+b)ρ. py-apy
pair − bpx ρair] (1) (where ■ = total volume of the phosphor layer Vair: volume of air in the phosphor layer A: total weight of the phosphor layer ρX: density of the phosphor py: density of the binder ρair: Density of air a: weight of phosphor b: weight of binder) Furthermore, in equation (1), ρair is approximately 0, so equation (1) can be approximately expressed by equation (II) below. .

V air /V = (a”b) ρg ρy V-A ( apy +
Elx ) V [(a+b)ρ8 ρy ] (II) (where, V, Vair, A, ρ8, ρ,, a
, and b are the same as in equation (1)) The porosity of the radiation intensifying screen manufactured by the present invention is 30%
The following is preferable.

Further, the filling rate of the phosphor can be determined by the following equation (III).

Aaρy V [(a+b)ρ8 ρy1 (III) (However, V%Vair, A, 9yt, 7)y
- The definitions of a- and b are the same as in formula (I)) In a normal radiation intensifying screen, a phosphor layer is placed on the surface of the phosphor layer on the side opposite to the side in contact with the support as described above. A transparent protective film is provided for physical and chemical protection. It is preferable to provide such a transparent protective film also in the radiation intensifying screen of the present invention.

The transparent protective film may be made of, for example, a cellulose derivative such as cellulose acetate or nitrocellulose; or a synthetic polymer material such as polymethyl methacrylate, polyvinyl butyral, polyvinyl formal, polycarbonate, polyvinyl acetate, or vinyl chloride/vinyl acetate copolymer. It can be formed by coating the surface of the phosphor layer with a solution prepared by dissolving a transparent polymeric substance in an appropriate solvent. Alternatively, plastic sheets made of polyethylene terephthalate, polyethylene naphthalate, polyethylene, polyvinylidene chloride, polyamide, etc.:
Alternatively, a protective film-forming sheet such as a transparent glass plate may be formed separately and adhered to the surface of the phosphor layer using a suitable adhesive.

The thickness of the protective film is generally in the range of about 0.1 to 20 μm.

Next, examples of the present invention will be described. However, these examples do not limit the present invention.

[Example 1] Phosphor 2Gd202S: Tb...200g
Binder: Polyurethane thermoplastic elastomer (Desmolac TPKL-5 manufactured by Sumitomo Bayer Urethane)
-2625 [Solid content 40%])...20g: Nitrocellulose (nitrification degree 1L, 5%)...2g was added to methyl ethyl ketone solvent and dispersed with a blowera mixer,
A coating liquid for forming a phosphor layer with a viscosity of 30 PS (25° C.) was prepared (binder/phosphor ratio = 1720).

Separately, as a coating liquid for forming an undercoat layer, soft acrylic resin solid content...90g nitrocellulose.
......50g was added to methyl ethyl ketone, dispersed, and mixed to prepare a dispersion having a viscosity of 3 to 6 PS (25°C).

Polyethylene terephthalate (support) with a thickness of 25.0 μm mixed with titanium dioxide is placed horizontally on a glass plate, and the above coating solution for forming an undercoat layer is uniformly applied onto the support using a doctor blade. , the coating film was dried by gradually raising the temperature from 25°C to 100°C to form an undercoat layer on the support (thickness of the coating film: 15 μm). The above-mentioned coating solution for forming a phosphor layer was uniformly applied onto the film using a doctor blade to a thickness of 180 μm, dried, and then compressed.

Compression was performed using calender rolls to 400κg w
It was carried out at a pressure of / cm 2 and a temperature of 80 °C.

After this compression, a transparent protective film was formed by adhering a polyethylene terephthalate transparent film (10 μm thick) coated with a polyester adhesive on one side with the adhesive side facing down.

In the manner described above, a radiation-sensitizing screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was manufactured.

[Example 2] In Example 1, the pressure during compression was set to 600 Kgw/c.
A radiation-sensitizing screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Example 1 except that m2 was used.

[Comparative Example 1] In Example 1, a radiation intensifying screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Example 1 except that no compression was performed. .

[Comparative Example 2] In Example 1, phosphor: G d 2 0 2 S: T b...
...200g Binder: Polyester resin (S-BEL 1540 manufactured by Hitachi Chemical) ...20g = Nitrocellulose (nitrification degree 11.5%) ...Add 2g to methyl ethyl ketone solvent to form a phosphor layer A radiation-sensitizing screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Example 1, except that a coating solution was prepared.

[Comparative Example 3] In Comparative Example 2, the pressure during compression was set to 600 Kgw/a.
A radiation-sensitizing screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Comparative Example 2, except that m2 was used.

[Comparative Example 4] In Comparative Example 2, a radiation intensifying screen composed of a support, an undercoat layer, a phosphor layer, and a transparent protective film was manufactured in the same manner as in Comparative Example 2 except that no compression was performed. .

[Example 3] In Example 1, Phosphor: Gd202S:Tb...200g Binder: Polybutadiene thermoplastic elastomer TR2000 (Vicat softening point 47°C)...8g Nitrocellulose ( The support, undercoat layer, and phosphor were prepared in the same manner as in Example 1, except that 2 g of nitrification degree 11.5%) was added to the methyl ethyl ketone solvent to prepare a coating solution for forming a phosphor layer. A radiation-sensitizing screen was produced consisting of a layer, a transparent protective film.

[Example 4] In Example 3, the pressure during compression was set to 600K g w.
/ cm 2 A radiation intensifying screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Example 3, except that the ratio was 2.

[Comparative Example 5] A radiation intensifying screen composed of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Example 3 except that no compression was performed. did.

[Comparative Example 6] In Example 3, Phosphor: Gd202S: Tb...200g Binder: Polyacrylic resin (Criscoat PI+20 manufactured by Dainippon Ink ■)...
・ ・ 8 g: Nitrocellulose (nitrification degree 11.5%) 2 g was added to the methyl ethyl ketone solvent to prepare a coating solution for forming a phosphor layer, but a support was prepared in the same manner as in Example 3. A radiation-sensitizing screen consisting of a subbing layer, a phosphor layer, and a transparent protective film was manufactured.

[Comparative Example 7] In Comparative Example 6, the pressure during compression was set to 600 Kgw/c.
A radiation-sensitizing screen consisting of a support, an undercoat layer, a phosphor layer, and a transparent protective film was produced in the same manner as in Comparative Example 6 except that m2 was used.

[Comparative Example 8] In Comparative Example 6, a radiation intensifying screen composed of a support, an undercoat layer, a phosphor layer, and a transparent protective film was manufactured in the same manner as in Comparative Example 6 except that no compression was performed. .

Each of the radiation-sensitizing screens manufactured as described above was evaluated by the method described below.

(1) Image sharpness test A radiation intensifying screen and an X-ray photographic film (HR-S manufactured by Fuji Photo Film ■) were crimped together in a cassette, and X-rays were irradiated with a tube voltage of 80κVp through a resolution cartridge. TeX
A radiograph was taken, and the contrast transfer function (CTF) of the completed radiograph was measured and evaluated as a spatial frequency of 2 cycles/mm.

(2) Image graininess test A radiation intensifying screen and an X-ray photographic film (HR-S manufactured by Fuji Photo Film ■) were pressed together in a cassette, and a water phantom (thickness: 10 cm) and an aluminum plate (thickness:
10 mm) and a tube voltage of 80 at a concentration of 1.0.
An X-ray photograph was taken by irradiating KVp X-rays. This X-ray photographic film was processed using a developing solution (RD, manufactured by Fuji Photo Film) using an automatic processor (NewRN, manufactured by Fuji Photo Film).
III) at a temperature of 35° C. for 90 seconds.

The obtained X-ray film was measured with a microphotometer (Anokuichi v-: 300 μm x 300 μm) to determine the RMS value. This RMS value was used as a measure of graininess.

The above test results are shown in Table 1.

Table 1 with blank spaces below CTF (%) Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 3 Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 28.1 29. 8 27.0 27.9 29.0 27.4 28.5 30.4 27.5 28.3 29.6 27.8 RMS (XIO~2) 1.40 1.44 l. 44 l. 48 l. 52 l. 43 l. 40 1.42 1.46 1.54 1.55 1.50 The higher the plot is, the higher the sharpness is. The horizontal axis indicates graininess, and the farther left the plot is, the better the graininess is.

As is clear from Table 1 and Figures 1 and 2, the radiation intensifying screen of the present invention has slightly improved sharpness compared to the comparative panel manufactured using conventional methods. It can be seen that the graininess is significantly improved.

[Brief explanation of drawings]

FIGS. 1 and 2 are graphs showing the image quality of radiation intensifying screens according to Examples and Comparative Examples. The results are also shown in FIGS. 1 and 2.

Claims (2)

[Claims] 1. a) Forming on a support a phosphor layer consisting of a phosphor and a binder in which 10% by weight or more and 100% by weight or less of the components is a thermoplastic elastomer with a softening temperature or melting point of 30°C or more and 150°C or less. . b) A method for producing a radiation intensifying screen, comprising the step of compressing the phosphor layer at a temperature equal to or higher than the softening temperature or melting point of the thermoplastic elastomer. 2. a) forming a phosphor sheet comprising a phosphor and a binder in which 10% by weight or more and 100% by weight or less of the components is a thermoplastic elastomer with a softening temperature or melting point of 30°C or more and 150°C or less; b) the above-mentioned A radiation sensitization method comprising: compressing a phosphor sheet at a temperature equal to or higher than the softening temperature or melting point of the thermoplastic elastomer; c) attaching the compressed phosphor sheet to a support. Screen manufacturing method.