JPH0329939A - Photosensitive element for radiograph and method of forming x-ray image - Google Patents

Abstract

PURPOSE: To give various advantages for decreasing cross-over phenomenon by forming a silver bromoiodide particle containing a specific quantity of one having an average particle diameter, effectively non-photosensitive and low in silver iodide content and a dispersed zinc oxide particle in a hydrophilic colloid layer and adsorbing a spectral sensitizing dyestuff on the silver bromoiodide particle to form absorption band. CONSTITUTION: This radiophotographaic photosensitive element is composed of a transparent supporting body base, at least on one surface of which a spectrally sensitized silver halide emulsion layer is applied, and the hydrophilic colloid layer formed between the supporting body base and the sliver halide emulsion layer. The hydrophilic colloid layer contains the silver bromoiodide particle having 0.01-0.1μm average particle diameter, effectively non-photosensitive and low in silver iodide content and the dispersed zinc oxide particle. The spectrally sensitized dyestuff is adsorbed on the bromoiodide particle to form the absorption band, and the dyestuff adsorbed on the silver bromoiodide particle has a considerable absorption in the region of electromagnetic spectrum, substantially equivalent to the spectral sensitivity of the silver halide emulsion layer. As a result, the various advantages are given for decreasing the crossover without inducing adverse effects.

Description

DETAILED DESCRIPTION OF THE INVENTION Separation of the Invention The present invention is a photosensitive silver halide element to be used in radiolithographic techniques, %yc to be used with intensifying screens to obtain improved X-line images. Related to photosensitive silver halide absorption.

BACKGROUND OF THE INVENTION In radiography, especially medical radiography, transparent
A light-sensitive element having a silver halide emulsion layer coated on one side of a light-sensitive carrier.
e1ment) is used. Summer compared to single-sided coating elements! It is known that in order to obtain good developability, it is preferable to use a safety layer containing silver halide emulsions on both sides. Photosensitive elements coated with a silver halide emulsion layer on one, preferably both, sides of the support reduce the amount of X-ray exposure necessary to obtain the required image. Generally used in conjunction with an intensifying screen. Typically, one intensifying screen is used on each side of the photosensitive layer. The silver halide used in the light-sensitive element is sensitive or insensitive to a region of the electromagnetic spectrum that corresponds to the wavelength of light emitted by the luminescent material used in the intensifying screen, and thus has significant sensitivity. amplification factors
is obtained.

The quality of the images obtained by exposure and development of these radiographic elements is affected by light scattering and crossover radiation.
er exposure), that is, a negative influence is received in the cross dew nine. Light scattering occurs in both radiographic materials coated with Emulsion J So on one and both sides. It is because the light emitted by one screen is diffused by silver halide particles (
This is caused when the image is blurred, which reduces the sharpness of the image.

Crossover exposure - which is also a cause of reduced image sharpness - occurs in radiographic materials coated on both sides of emulsion layers, where light emitted by one screen passes through an adjacent emulsion layer and is spread out by the support. This occurs when the light imagewise exposes the emulsion layer on the opposite side of the support.

Crossover exposure can result in poor resolution even when using all light sensitive elements with reduced silver halide coverage to lower the cost of the photographic element or increase the processing speed of the element. The reduction in the turbidity of the 1b1 emulsion increases the amount of light available for crossover, thus deteriorating the image quality.

Dyes or pigments can be conveniently incorporated within the photographic element to reduce crossover phenomena. The absorption of the dye or pigment corresponds to the wavelength of the light emitted by the intensifying screen1! in the magnetic spectrum. The dyes or pigments absorb some or all of the light emitted by the intensifying screen κ, so that imaging of the rear emulsion by the front screen is reduced by absorption by the anti-crossover layer κ from the front screen. These dyes or pigments are removed during the photographic development, fixing and/or washing steps of the exposed material. That is, they can be washed off, for example, or preferably marked, during processing of the radiographic Jic element.

15? The element can be incorporated in any layer of the photosensitive element, either in the emulsion layer, in an intermediate layer between the emulsion layer and the support, or in the underlying Ikff layer of the support base. The dye is preferably incorporated in a layer different from the emulsion-containing layer to avoid possible desensitization phenomena. Since 1978, Minnesota Mining and Manufacturing Co.
Minn880taMining andManuf
Acturing Company has been marketing radiographic elements under the name 3M Trimax™ (Trimax™ Type XUD X-i film).

This is a film used in conjunction with a 3M Remax™ intensifying screen. The radiographic X element comprises a transparent polyester support, each side of which has a silver halide emulsion sensitized to the light emitted by the screen. Between the emulsion and the support there is a layer of gelatin containing water-bathable acidic dyes, which can be bleached during processing and which can be dyed in the electromagnetic spectrum corresponding to the wavelength of the light emitted by the screen. It has absorption in the spectral sensitivity range of the emulsion. The dye is deposited in the layer by a basic mordant consisting of 16% polyvinylpylene.

To date, a practical solution for reducing cross-over exposure by using a mordant dye layer (described in European Patent Specification No. 101,295) has not been developed to date. There are several issues that have arisen that have not been fully resolved. The modification of B1 image resolution is not only due to the natural sensitivity reduction of the photosensitive element caused by transmission and absorption of diffuse light (which would otherwise contribute to the formation of part of the image), but also due to the It is also accompanied by a tendency of desensitization due to the migration of dyes that are not solidly mordanted into the silver halide emulsion layer.

There are also problems with residual contamination even after processing, i.e. thiol salts from the fixer bath are retained in significant amounts, which yellows the image on long-term storage, and because of the thickening of the element after processing. There is also the problem that drying time becomes longer.

Other ways to reduce crossover have been proposed as shown below.

In U.S. Patent No. 3,923,515,
A silver halide emulsion having a relatively low photographic sensitivity is interposed between a support and a silver halide emulsion layer having a high photographic odor sensitivity in order to reduce crossover.

In U.S. Patent No. 4,639,411,
Blue-sensitive silver iodide emulsion layers are spread on both sides of a transparent support, and between the support and the emulsion there are bright yellow silver iodide grains with a specific crystal structure. A photographic X-element is disclosed that is to be used with a blue-emitting intensifying screen that requires full layer intervening, low crossover properties.

JP-A No. 62-52546 discloses that a photosensitive silver halide emulsion layer is spread on both sides of a transparent support, and water with a dye adsorbed on the surface is formed between the support and the emulsion layer. A radiographic X-element is disclosed that has improved image quality with an intervening layer containing metal salt particles that are insoluble in the present invention. The dye has an absorption maximum within -1=20 mm of the absorption maximum of its iron halide and corresponds to the light emitted by the intensifying screen. Silver halide is disclosed as a preferred metal salt particle.

In Takekai No. 62-99748, a photosensitive silver halide emulsion layer is disposed on both sides of a transparent support, and there is no substantial photosensitivity between the support and the emulsion layer. An improved radiographic element having a silver lodenide emulsion layer is disclosed.

In the method of using an insensitive silver halide layer as a cross-over prevention layer interposed between the support and the photosensitive silver halide emulsion layer, it is preferable to use dyes or pigments, but There are some problems such as increase in bleaching properties and poor bleaching properties during photographic processing (residue contamination).

iK, 7/lance%FFt. 2,0 8 4,6
6 9 Akira aJ! describes a dual-coated radiographic element with an absorption enhancer containing manganese dioxide dispersed particulate gold between a support and a silver halide emulsion. GB Pat. No. 2,075,208 discloses an improved electrostatic charging method having proprietary metal acid 19ide particles dispersed in a binder in one tube on a support. Silver halide photographic materials with protective properties are described. Also, the 4th US special iFF,
5 7 4, 1 1 5 discloses a layer comprising a silver halide emulsion layer and a layer containing photoinsensitive metal salt grains (for example, silver halide grains or zinc oxide grains) on which a dye is layered. The absorption maximum of the dye is 20% from the maximum sensitization of the emulsion located far from the light source than the dye-containing layer.
Silver halide photographic materials with a separation of nm or more are described.

SUMMARY OF THE INVENTION The present invention provides a transparent support base having at least one plane kappa spectrally sensitized silver halide emulsion layer interwoven therewith, and a green water emulsion layer between the support base and the iron halide emulsion layer. The hydrophilic colloid layer comprises (a) substantially K-insensitive, low silver iodide grains having an average grain size in the range of 0.01 to 0.1 μm; and (b) dispersed silver iodide grains. Zinc oxide grains contain gold; spectrally sensitizing dyes are adsorbed onto the silver bromoiodide grains to form a J band; the dye adsorbed onto the silver bromoiodide grains forms a silver halide emulsion. It has a small portion of its absorption in the region of the emission spectrum corresponding to a spectral sensitivity of 20 degrees; it relates to a silver halide X-ray element to be used with an X-ray intensifying screen.

The combination of absorption (absorption from the J band of insensitive silver bromoiodide grains) and reflection (reflection from zinc oxide grains) of the light emitted by the X-line intensifying screen results in a significant increase in sensitivity. It provides various benefits in reducing crossover without causing negative effects such as losses, residual angle contamination, image instability on storage, and excessive element thickness.

The invention therefore relates to a silver halide photosensitive element to be used in radiography in conjunction with a TPX-ray intensifying screen.

The photosensitive halogenated element for use in radiography with X-ray intensifying screens according to the invention comprises a transparent support base and a silk cloth on at least one of its sides, preferably on both sides. It consists of a spectrally sensitized silver halide emulsion and a hydrophilic colloid layer interposed between the support base and the halide emulsion layer. Here, the hydrophilic colloid layer contains (aJ substantially light-insensitive silver bromoiodide grains of low silver iodide and (bJ dispersed zinc oxide grains), and certain silver iodide grains U0 It has an average grain size in the range of .01 to 0.1 μm, and spectrally sensitizing dye is adsorbed on the silver iodide grains to form a J band, and then K is adsorbed on the bromoiodide sea bream grains. The dye has the advantage of having its absorption in a region of the magnetic spectrum that substantially corresponds to the spectral sensitivity of the silver halide emulsion.

In the present invention, the term "use@1 low silver iodide silver bromoiodide grains" refers to the total percentage of silver iodide grains in which the proportion of silver iodide is 0 mole or more and 10 moles or less. It is preferable to limit the total silver halide present in the silver iodide grains provided by a given silver iodide grain to less than 5 moles φ, and less than 6 moles φ is preferable. Grains containing at least 1 mole of silver iodide are preferred for producing the desired J band.

Certain silver iodide grains are surprisingly insensitive. That is, they do not form any images when commonly exposed to radiation with wavelengths in the range of 420 to 700 nanometers (e.g., 10-2 second exposure) and developed with standard black-and-white and color developers. . Such sensitivity can be generally stated to be less than ASA 1. In the case of the emulsions of the present invention, they are preferably of a sensitivity of less than ASA 1 0-1. The grain size of the light-insensitive silver bromoiodide grains is particularly limited. That is, the particles have an average diameter of 0.1 μm or less.

The minimum average diameter of the particles is limited only by ease of manufacture. Typically an average diameter of at least 0.01 μm
Particles are used. The inventive light-insensitive silver bromoiodide grains have adsorbed on their surface a spectrally sensitizing dye which exhibits maximum absorption in the blue and/or green and/or red portions of the visible spectrum. When the spectrally sensitizing dye according to the present invention is adsorbed on the surface of silver halide grains, it exhibits a panchromic shift (bathochromic shift) relative to the absorption maximum of the free dye in aqueous solution.
Ifting) produces a sharp slave zone (J zone). The spectral sensitive pigments that make up the J-Izumi aggregates are manufactured by John Wiley and S.
onF3) Publication 2 Chapter 4 Eng 7●M11 Hammer (F.M, Hamor
) published by Macmillan (1977) Process) No. 4 M. , in Chapter 8, T.H., Rame
e) explains, the total number of people in this technical field is 80,000.

In one preferred embodiment, the dye with J@ is a cyanine dye. This dye contains two heterocyclic nuclei connected by a bond of methine groups.

Preferably, the heterocyclic nucleus contains a fused benzene ring in order to enhance J aggregation. The heterocyclic nucleus is quinolinium, penzoxazolium, pendethiazolium, penzoselenazolium, penzimidazolium, nanthoxazolium,
Preferred are quaternary salts of naphthothiazolium and naphthoselenazolium. The J-band type dyes preferably used in the present invention have the following general formula (IJ: (A-)k(B''), where Zl and z2 are equal to or different from each other. and each represents the element gold necessary to complete the cyclic nucleus formed in the basic heterocyclic nitrogen compound. Heterocyclic nitrogen compounds include, for example: oxazoline,
Oxazole, penzoxazole, naphthoxazole (e.g. naphtho(2,1-aJ oxazole, nanth {2.3-d}oxazole tomobi naph}{1.2-a)
oxazole], theazoline, thiazole, penzothiagur, naphthothiazole (e.g. Nantes (2.1
-a) theazole), thiazolequinol/s (e.g.
Thiazoline {4.5-a}quinoline), selenazoline,
selenazole, penzoselenazole, naphthoselenagol @ (e.g. Nantes {1.2-cl) selenazole)
, 3n-indoles (for example, ro, 3-7 methyl-6
H-indolno, penzindoles (e.g. 1,
1-zometerpene zindole IV), imigzoline, imidazole, penzimidazole, naph 1 imidazole (e.g. napf 1 ・(2.3-aJ imidazole)
, Virizon Tomobi Kinoline. If you use the above compound, you can use one or more types of Iikatamine glazes in the range of mu on the ring! ) may be substituted. As substituents, starvation compounds include hydroxy, halogens (inverted: fluorine, bromine, chlorine and iodine), alkyl groups or substituted alkyl groups (e.g. methyl, ethyl, sorovir, inglovir, butyl, otatyl, dotesyl, 2-
hydroxyether, 3-sulfoprobyl, carboxymenal, 2-cyanoethyl and trinorolomethyl), aryl or covalent aryl groups (e.g. phenyl, 1-
naphthyl, 2-naphther, 4-sulfonenyl, 6-carboxyphenyl & 4-biphenyl), aralkyl groups (e.g. penzol and phenetel), alkoxy groups (
For example, methoxy, ethoxy and isobroboxy), aryloxy groups (for example, phenoxy and 1-naphthoxy), alkyl groups (for example, ethylthio and methylthio), arylthio groups (for example, phenyl or substituted amino groups) Examples are anilino, zomethylanilino, zoetheranilino and morpholino/), acyl groups (eg 'acetyl and benzoyl) and sulfo groups.

R and R can be the same or different groups, and substituents (inverted are carboxymethyl, 2-hydroxyethyl, 6-sulfoprobyl, 3-sulfobuter, 4
- alkyl threads, aryl groups, argunyl groups or aralkyl groups with or without sulfobutyl, 2-methoxyethyl, 2-sulfatoethyl, 6-teosulfatoethyl, 2-phosphonoethyl, chlorophenyl and promophenyl) Waching.

R3 is a hydrogen atom gold plate.

R4 and R5 can be the same or different atoms or groups, and are hydrogen atoms or lower alkyl groups of 1 to 4 carbon atoms.

27 p or q is 0 or 1. However, p and q are preferably not 1 at the same time.

m is mouth or 1. However, when m is 1, both p and q must be zero, and one of z1 and z2 represents imigzoline, oxazoline, thiazoline or selenazoline.

A is an anionic group. ! 9, Bll''ll: is a cationic group, and k and l can be D or 1 depending on whether ionic substituents are present.

In the above, R1 and R3, R2 and R5, or R1 and R2
Of course, it is also possible to make a modification in which each of these together represents the atoms necessary to complete the alkylene bridge.

28 More preferred dyes that are adsorbed on substantially light-insensitive silver bromoiodide grains are those represented by the following general formula (1): where R10 is a hydrogen atom or a lower group of 1 to 4 carbon atoms. represents an alkyl group (e.g. methyl and ethyl), R6
+ R7 + R8 and R9 are each hydrogen atoms, /-%
0 ) f atoms (e.g. chlorine, bromine, iodine and fluorine), hydroxy groups, alkoxy groups (e.g. methoxy and ethoxy), amino groups (e.g. amino, methylamino and dimethylamino), acylamino groups (e.g.
acetamide and probionamide), acyloxy groups (e.g. acetoxy groups), alkoxycarbonyl groups (
For example, methoxycarbonyl, ethoxycarbonyl and butoxycarbonyl), ? alkyl groups (e.g. methyl,
ethyl and isopropyl), an alkoxycarbonylamino group (e.g. ethoxycarbonylamino) or an allyl group (e.g. phenyl and tolyl), or R6 and R, and R8 and R9 taken together respectively form a benzene ring. (thus the heterocyclic nucleus would be, for example, an α-naphthoxazole nucleus, a β-nanthoxazole nucleus or a β,/-naphthoxazole nucleus), R1■ and Re2 are each an alkyl group (
methyl, probyl and butyl), hydroxyalkyl groups (e.g. 2-hydroxyether, 3-hydroxyzorobyl and 4-hydroxybutyl), acetoxyalkyl groups (e.g. 2-acetoxyethyl and 4-acetoxybutyl) , alkoxyalkyl group (e.g. 2
-methoxyethyl and 3-methoxyprobyl), carboxyl groups containing alkyl groups (e.g. carboxymethyl, 2-carpoxyethyl, 4-carboxybutyl and 2-(2-carboxyethoxy)monoethyl), containing alkyl groups Sulfo groups (e.g. 2-sulfoethyl,
3-sulfozolovir, 4-sulfozotyl, 2-hydroxy-3-sulfoprobyl, 2-(3-sulfoproboxy)-zolobyl, p-sulfobenzyl and p-sulfophenethyl), penzyl group, phenethyl group, vinylmethyl group, etc. , X- is an acid anion (e.g. chloride,
bromide, iodide, thiocyanate, methyl sulfate, ethyl sulfate, perchlore} and p-}luenesulfonate ion), and np1 or 2.

Substituent R6 + R7 + R8 t R9 + R1
. The alkyl group contained in and Rll, more specifically, the alkyl moiety of the alkoxy, alkoxycarbonyl, alkoxycarbonylamino, hydroxyalkyl, acetoxyalkyl group, and the alkyl group bonded to a carpoxy or sulfo group is preferably 1 to 1. 12 pieces, even better 1
preferably contains 1 to 4 carbon atoms, the total number of carbon atoms contained in the group being 20 to 31 32 .

The aryl groups contained in the substituents R6 + R7 + Re and R9 each preferably contain 6 to 18 carbon atoms, more preferably 6 to 10 carbon atoms; The total number of carbon atoms included is 20 or less.

The following J belongs to those represented by the above general formula (ff)
This is an example of the identification of band-sensitizing dyes.

According to the present invention, a sharp absorption band (J band) exhibited by a spectral sensitizing dye adsorbed on the surface of a light-insensitive silver halide grain
It has been found that the intensity varies with the amount of the particular dye selected, as well as with the size and chemical composition of the silver halide grains. The maximum strength of the J-band is determined by the above grain size and the J-band photosensitizing dye adsorbed at a concentration of 25 to 100% of the coating amount of a monomolecular layer relative to the total effective surface area of the silver halide grains. obtained by those silver halide grains having a chemical composition. The optimum dye concentration level can be selected in the range of 0.5 to 20 mmol, preferably 2 to 10 mmol per mole of silver bromoiodide, and is added in the presence of a water-soluble iodide salt or isobromide salt. I like that. It has been found that the J band exhibited by the dyes adsorbed on these particles is enhanced by the presence of the above salt. It is further advantageous for the salt to be added to the silver halide emulsion before dye ripening, ie before the resting step following dye addition. This pause is preferably carried out at a temperature of 40-300C for about 5-150 minutes. Typical water-soluble salts include alkali metal, alkaline earth metal, and ammonium iodides and bromides, such as ammonium, potassium, lithium, sodium, cadmium, and strontium iodides and bromides. The amount of water-soluble iodide and bromide salts ranges from 50 to 5.0 OmQ per mole of silver, preferably i 1,<ldl 0 0 to 1,000 mQ.
Advantageously, it is within the range of .

The substantially light-insensitive emulsions of the present invention comprising silver bromoiodide fine grains of low silver iodide can be prepared by any of the known methods. In this technical field, Lippmann (Lippmann)
According to one preferred method, very fine grained emulsions known as ppmann') emulsions are useful in the present invention, in which the water-soluble bromide and iodide salts are combined with the water-soluble silver salts. It can be formed by a double-jet precipitation method in which a dispersion medium is simultaneously added to a reaction vessel containing the dispersion medium.

The dispersion medium for the silver bromoiodide grains can be selected from those commonly used in silver halide emulsions. , acetylated gelatin, phthalated gelatin, etc.), polysaccharides (eg, dextran), gum arabic, casein, and the like. 1. These hydrophilic colloids include polymers of acrylamide and methacrylamide, polymers of alkyl and sulfoalkyl acrylates and methacrylates, polyvinyl alcohol and its derivatives, polyvinyl lactam, polyamide, polyamine, polyvinyl acetate, and other synthetic polymer binders and resins. It is generally used in combination with a detoxifier. At the end of grain precipitation, water-soluble salts are removed from the emulsion using methods known in the art, such as by ultrafiltration.

Such substantially light-insensitive silver bromoiodide grains are neither chemically sensitized nor substantially ripened in situ.

In the present invention, the hydrophilic colloid layer coated between the support base and the silver halide emulsion layer contains dispersed metal oxide particles, and the differentiated product for forming a J band on the surface is coated during the development process (
Preferably, the metal oxide is a metal oxide that is removed during development, fixing, etc.). Zinc oxide is particularly preferred from the viewpoint of removing and decolorizing the dye during development. The particle size of the zinc oxide used in the present invention is not particularly limited.
Generally, it is 0.05 to 5 μm (average diameter), preferably in the range of 0.1 to 1 μm. The amount of zinc oxide used in this invention is not particularly limited, but is selected depending on the desired reflective effect and the desired transparency of the developed radiographic element. Generally speaking,
The amount is 0.1-10g/m2, preferably 0.5-3
It is in the range of 11/m2.

The photosensitive elements of this invention include polymeric support bases of the type commonly used in radiography, such as polyester support bases, especially polyethylene terelentate support bases.

At least one surface, preferably two surfaces, of the support base is coated with a layer of silver halide emulsion in a hydrophilic colloid. The emulsions applied to the two surfaces may be different and may include emulsions commonly used in photographic elements, such as silver chloride, silver iodide, silver chlorobromide, salt, silver bromoiodide, It can consist of silver oxide and silver bromoiodide emulsions.

Silver bromoiodide emulsions are particularly useful in X-ray photographic elements. Silver halide crystals have different shapes, such as cubic, octahedral,
It can have a spherical, tubular shape, and may have epitaxial growth.

The silver halide crystals generally have an average size in the range of 0.2 to 3 μm, more preferably 0.4 to 1.5 μm, and the emulsion has a total silver coverage in the range of about 3 to 69/m2. Applied to the support base. The silver halide binding material used is a water-permeable hydrophilic colloid, preferably gelatin, but also gelatin derivatives, albumin,
Other hydrophilic colloids such as polyvinyl alcohol, alginates, hydrolyzed esters of cellulose, hydrophilic polypynyl polymers, dextran, polyacrylamides, hydrophilic copolymers of acrylamide and alkyl acrylates may also be used alone or in combination with gelatin. I can do it.

Photosensitive elements according to the invention are used in conjunction with intensifying screens and exposed to radiation emitted by those screens. The screen is made from a relatively thick phosphor layer that converts a line of light into light (eg, visible light). The screen absorbs a portion of the X-line to a much greater extent than the photosensitive element and is used to reduce the dose of radiation necessary to obtain a useful image. Depending on their chemical composition, phosphors can emit radiation in the blue, green or red region of the visible spectrum, and silver halide emulsions are sensitized to the wavelength region of the light emitted by the screen. Sensitization is accomplished by using spectral sensitizers well known in the art. The X-ray intensifying screens used in practicing this invention are phosphor screens well known in the art. A particularly useful phosphor is a rare earth oxysulfide doped to control the wavelength of the emitted light and the efficiency of the phosphor itself. Preferred are lanthanum, gadolinium and ruthenium oxysulfides doped with trivalent terbium, as described in US Pat. No. 3,725.704. The preferred of these phosphors are
Gadolinium oxysulfide is made by replacing about 0.005 to about 8 weight da of gadolinium ions with trivalent telium ions, and when excited by ultraviolet rays, X-rays, or cathode rays, it emits light at around 544 nm. It emits light in the blue-green region of the spectrum with a main emission line at . The silver halide emulsion is preferably within the spectral region of the light emitted by the screen, preferably within 25 nm, more preferably within 15 nm, and most preferably 10 nm from the wavelength of maximum emission of the screen.
Spectrally sensitized to a spectral region within m. Many types and combinations of spectral sensitizers can be used. In one preferred embodiment of the invention, particularly useful spectrally sensitizing dyes are those that exhibit an absorption peak (J band) in the aggregated state. One advantage of the present invention
In a new embodiment, a particularly useful spectral sensitizing dye is one represented by the general formula (1). In the most preferred embodiment of the invention in which the screen phosphor is gadolinium oxysulfide doped with trivalent terbium ions and emitting light in the blue-green region of the visible spectrum, a particularly useful dye is Specific examples of dyes represented by the above general formula (II) doped with trivalent terbium ions and having absorption in the emission spectrum region of dolinium oxysulf7ide are shown above.

The spectral sensitizing dye adsorbed on the photosensitive silver halide grains is the spectral sensitizing dye adsorbed on the substantially light-insensitive, very fine, low silver iodide silver bromoiodide grains. Preferably, it has the same formula as the dye.

A hydrophilic colloid layer containing a substantially light-insensitive, very fine-grained, low silver iodide silver bromoiodide emulsion and dispersed zinc oxide grains is located between the support base and the silver halide emulsion layer. This is the layer applied in between.

Any light-insensitive layer according to the invention used alone in a radiographic element Kb having light-sensitive emulsion layers coated on both surfaces of the support can effectively reduce crossover from both screens. is clear. However, only one light-insensitive layer is required;
For convenience of manufacture, double-coated radiographic elements most commonly employ identical light-insensitive layers on opposite surfaces of the support. Hydrophilic colloids are as described above for the emulsion layer.
Although all types of colloids commonly used in photographic elements can be used, a preferred colloid is gelatin. This layer can be either an intermediate auxiliary layer coated between the basecoat B layer and the emulsion layer on the support base, or multiple layers of the same basecoat base on the support. As is known, in fact the photographic support base is itself hydrophobic and therefore, in order to ensure sufficient adhesion of the photosensitive hydrophilic layer, the hydrophilic layer,
That is, an undercoat B layer is required. In accordance with the present invention, a subbing layer, typically comprised of gelatin, is used to contain a substantially light-insensitive, very K-fine grained, low silver iodide silver bromoiodide emulsion and dispersed zinc oxide grains. This has the advantage of eliminating the first layer, thus reducing the thickness of the photographic material and reducing the drying time during the photoprocessing process. According to the invention, a substantially light-insensitive
The thickness of the layer containing very fine-grained, low-silver iodide silver bromoiodide emulsions and dispersed zinc oxide particles can be added to layers used as non-light-sensitive layers in photographic elements (e.g., intermediate auxiliary layers or This is the normal thickness of the sublayer. Generally speaking, its thickness is the thickness of the mouth. It is in the range of 0.05 to 2 μm.

Within such thickness ranges, as is known in the art, the smaller thickness, e.g. 0.05-0.5 μm
A thickness of 1 to 2 .mu.m is used when the layer acts as an underlying layer, and a thicker thickness, for example 1 to 2 .mu.m, is used when the layer acts as an intermediate auxiliary layer. Additionally, as is known to those skilled in the art, the coating method used to apply the underlayer, i.e., air knife coating, is thinner than the coating method used to apply the auxiliary layer, e.g., extrusion coating. Allows you to create layers.

A sharp absorption band (J
band) absorbs the light emitted by the intensifying screen,
Therefore, the objective is to avoid or reduce the crossover phenomenon. The presence of zinc oxide particles has the purpose of reflecting the light emitted by the intensifying screen and thus avoiding or reducing the sensitivity of the material. Of course, the greater the optical absorbance of the light-insensitive layer, measured at the wavelength corresponding to the main emission peak of the phosphor, the better the image quality of the material, but at the same time the sensitivity is reduced. Therefore, those skilled in the art will be able to determine the type and amount of spectrally sensitizing dyes adsorbed on the light-insensitive silver bromoiodide grains, depending on the desired ratio of image quality (crossover) and sensitivity, the water-soluble iodide or The absorbance in the J band can be selected by appropriately selecting the amount of bromide salt and the amount of silver coating and zinc oxide particles.

Particularly useful optical absorbances are in the range 0.3 to 2.0, read at wavelengths corresponding to the extreme spectral emission of the screen. The reduction in crossover achieved by the light-insensitive layer according to the invention is better than the crossover that can be achieved without the light-insensitive layer by at least 10%.
, more preferably at least 20 threads, most preferably at least 30% fewer. Within this absorbance range, X-ray photographic elements with high sensitivity and good image quality can be obtained at the lower absorbance values, while X-ray photographic elements with good sensitivity and high image quality can be obtained at the higher absorbance values. can get. The above absorbances do not take into account the possible optical density of the support base. The support base may contain the dyes described above.

In the technical field of photography, the photographic sensitivity achievable with silver halide grains increases as the concentration of sensitizing dye increases until the optimum dye concentration yields maximum photographic sensitivity, after which the dye concentration increases further. It is known that this reduces the achievable photographic sensitivity. The optimum amount of dye used may vary depending on the particular dye and on the size and aspect ratio of the particles. Surprisingly, the amount of dye adsorbed on the surface of the small aspect ratio cubic grain silver halide emulsion in the photosensitive layer can be increased beyond the optimum dye concentration, and to achieve all the advantages of the present invention, i.e., reduced light scattering and cross-over exposure without significant loss of photographic speed. becomes possible.

The J-band sensitizing dye is preferably added to a low aspect ratio cubic grain silver halide emulsion in the presence of a water-soluble iodide or bromide salt. J-band sensitization is increased by the presence of these salts, which increases the strong coloring of the device before processing and ultimately reduces exposure crossover with the addition of less dye. There is also less residual contamination after processing of the radiographic element. It is furthermore advantageous for these salts to be added to the silver halide emulsion before dye ripening, ie, the pause following dye addition.

The rest is preferably carried out at a temperature of 40 to 30° for a period of about 50 to 150 minutes.

Typical water-soluble salts include alkali metal, alkaline earth metal and ammonium iodides and bromides, such as ammonium iodide and bromide, potassium, lithium? aluminum, sodium, cadmium and strontium. Advantageously, the amount of water-soluble iodide and bromide salts is less than 10 units per mole of silver, and preferably ranges from about 40 to about 70 units per mole of silver.

Other radiographic elements according to the present invention having highly desirable imaging properties include those disclosed in U.S. Pat. No. 4,425,425 and U.S. Pat. Some use high aspect ratio tabular grain emulsions or intermediate aspect ratio tabular grain emulsions that are sensitive to light or higher. Preferred tabular grain emulsions for use in the radiographic elements of this invention have tabular silver halide grains having a thickness of less than 0.5 μm, preferably less than 0.3 μm, and optimally less than 0.2 μm. But 5 = 1,
It preferably has an average aspect ratio of 8:1 or more, optimally 12:1 or more, and preferably 50 or more of the total prominent area of the silver halide grains present in the emulsion. is 70
% or more, optimally 90% or more. Specifically, as exemplified in European Patent Application No. 84,63747, a tabular grain emulsion is added to a support near a non-tabular grain silver halide emulsion layer to reduce crossover. It is intended to provide a double coated radiographic element according to the invention in which the layers are coated.

The photosensitive, low aspect ratio, cubic-grain silver halide or tabular-grain silver halide emulsion layer itself reduces cross-over by adding the photo-insensitive, low-iodide silver bromoide emulsion layer according to the invention. In combination with emulsion layers, radiographic elements can be obtained which have extremely low levels of crossover while also achieving high photographic speed and low residual stain.

In the light-sensitive silver halide emulsion layers of the radiographic elements of this invention, the spectral sensitizing dyes are mixed in with additional agents such as stabilizers, anticapri agents, development modifiers, coating agents, brighteners, and antistatic agents. , or in combination with these agents. Mixing or combining with those additional reagents results in supersensitization (i.e., either as could be obtained using the dye or the additional reagent alone or resulting from the effect of the addition of the dye and the additional reagent). (This will also result in a large spectral sensitization). Source of supersensitization 18,418
~430 (1974). In particular, according to the present invention, a spectrally sensitizing dye is used as described in U.S. Pat.
, 183, a polymeric compound having a supersensitized amount of an amino-allylidene-malononitrile moiety, such as a copolymer of a vinyl addition monomer and a 3-diallyruamino-allylidene-malononitrile monomer, is introduced. Advantageous results can be obtained by combining them.

In addition to the features specifically mentioned above, photographic elements of the present invention are disclosed in Research Disclosure.
Disclosure) Stabilizers, antifoggants, brighteners, absorbents, hardeners, coating aids, plasticizers, lubricants, as described in Section 17643, December 1978 and Section 18431, August 1979. Additional additives of conventional properties can be included in the light-sensitive silver halide emulsion layer or other layers, such as agents, matting agents, anti-kinking agents, antistatic agents, and the like.

A preferred radiographic element is Belgian Patent No. 757,
No. 8 1 5 and U.S. Patent No. 3,7 0 5, 8 5
8, i.e. a transparent support coated with at least one light-sensitive silver halide emulsion layer on both surfaces, both layers having a gold/silver coverage per surface unit of about 6
El/yn2 or less, preferably 5 g/m2 or less. Preferably, such a support is a polyester film support such as polyethylene terephthalate film. Generally speaking, supports for use in medical radiography are dyed blue. Preferred dyes are U.S. Pat. Nos. 3,488,195, 3,849,139 and 3,91.
No. 8,9 7 6, No. 933, 5 0 2,
3,9 4 8,6 6 4, and British Patent Nos. 1,2 5 0,9 8 3 and 1,3 7 2
．． Anthraquinone dyes such as those described in US Pat. No. 6,668.

The exposed radiographic element can be processed by any conventional processing method. Such a processing method? , as described, for example, in Research Disclosure Section '17643, supra. U.S. Patent No. 3,025,779
No. 3, 5 1 5, 5 5 6, No. 3, 5
4 5, 9 7 No. 1 and 3, 6 4 7, 4 5
Particular preference is given to the starting roller conveying process described in No. 9 and British Patent No. 1,269.268.

It is also possible to process using hard film development methods such as those described in U.S. Pat. No. 3,232,761.

Regarding the preparation of silver halide emulsions and the use of specific ingredients in emulsions and light-sensitive elements, reference is made to Research Disclosure No. 18,431, dated August 1979, which contains the following chapters: Covered in detail: IA. - Preparation, purification and concentration method of ronated emulsion, ■B. Emulsion type, IC. Crystal chemical sensitization and doping, L stabilizers, antifoggants and foldane inhibitors (
antifolding) agent, 11A. stabilizers and/or
or antifoggant, 51 52 HB. Emulsions stabilized or chemically sensitized with gold compounds, ■c
．． Stabilization of emulsions containing polyalkylene oxides, ie plasticizers, HD. Fog caused by metal contaminants, 11F
．． Stabilization of materials containing covering power enhancers, IFF. Anti-capri agent for two-color fog, JIG. Hardeners and anticapri agents for liquid image solutions containing hardeners, 11H. Additives to minimize desensitization due to folding, anti-capri agents for emulsions coated on 11L polyester support bases, ■J. Method for stabilizing emulsions exposed to safe light, 1 [K. Stabilization method for X-ray materials used for high temperature applications, layered access, roller processor conveyance treatment, g. Compounds and antistatic layers, ■. protective layer, V. M art supplies, ■. Materials for processing in a light room, Wl. X-line color material, ■. Phosphor and intensifying screen, ■. Spectral sensitization, X. UV-sensitized material, XI. Support base.

Example 1 A photosensitive cubic grain silver bromoiodide gelatin emulsion (containing 2.3% silver iodide) was prepared. This emulsion has an average diameter of about 0.
It consisted of cubic grains of 7 μm and an average aspect ratio of about 1:1. The emulsion was chemically sensitized with a sulfur compound and a gold compound, spectrally sensitized with a green spectral sensitizing dye of 0.750 g/mol to silver, and 60 m9 to silver.
K. was added in an amount of /mole. stabilizers, antifoggants,
This emulsion, with the addition of surfactants and gelatin hardeners, was applied to both sides of a subbed polyethylene terephthalate support base (dyed blue with anthraquinone dyes and having a green light optical density of 0.13). did.

The emulsion contained 2.2 g/m2 of silver per area and 1.2 g/m2 of gelatin. 6g
/m. Each emulsion layer was finally coated with a protective gelatin layer at a gelatin coverage of 1.19/m2 (Film 1A).

A light-insensitive, fine-grained silver bromoiodide gelatin emulsion (containing 2 moles of silver iodide) was prepared. This emulsion has an average diameter of 0.
It consisted of particles of 0.06 μm. 5 for silver in emulsion.
5 g/mol of green spectral sensitizing dye and 4 for silver
0 mQ/mol of monopotassium iodine was added. A dispersion of fine particles of zinc oxide with an average diameter of 0.5 .mu.m was added to this emulsion in an amount such that the emulsion had 1,080 9 zinc oxide per mole of silver. Zinc oxide dispersions were prepared by dispersing zinc oxide in gelatin in the presence of an anionic dispersant with the aid of a high speed stirrer. This emulsion was coated on both sides of the support base with 0.19/m2 of silver, 1F/m2 of zinc oxide, and 1.5% of gelatin per surface. ! It was applied at V/m2.

The above film 1 was coated on both surfaces of the thus obtained Noilum.
A halogenated emulsion layer and a protective layer were applied as a human (Film 1B).

Each film was coated with two 3M green-emitting intensifying screens.
The sample was sandwiched between 3M Trimax™ and then exposed to a 300 mA% 80 KV single line X for 0.15 seconds through a laminated aluminum stepped optical wedge. After exposure, the films are transferred to a 3M rematake 1 (3M) roller conveyance processor.
M Trimatic™) XP 5 Q 7. Processing is done by 3MXAD/2 developer (Dev
eloper) for 24 seconds at 35°C, followed by fixing in a 3MXAF/2 Fixer for 24 seconds at 6°C, washing in tap water for 22 seconds at 35°C, and drying at 35°C for 22 seconds. It was like that.

The sensitometric results and image quality results are shown in a table below. The crossover rate (multiple) was calculated using the following formula.

1 However, δlog E is the difference in sensitivity between two emulsion layers of the same film when exposed using one screen (the smaller the crossover ratio 55 56 , the better the image quality). The J-band measurement is performed with reference to the spectrophotometric curve of the unexposed film in the 400-700 nm region, and is determined at 549 nm, which corresponds to the absorption J-band peak of the dye, which is close to the main emission peak of the phosphor of the screen. This was done by measuring the absorbance of

Table 1 1 person 1B 1o** 4.4 1. Ro5 3.09
344.6 1.76 3
．． 10 177.1 1.70
2.75 17* J band of double-sided coated photoinsensitive silver bromoiodide layer.

#3M XUD Film: An anti-crossover film with emulsion layers coated on both sides of a support base and a mordanted dye layer between each emulsion layer and the support. The total silver coverage of the film is 7.1 g/m2.

Example 2 Same as film 1A of Example 1, total silver coverage was 4.2
4 g/m2 radiographic film (Film 2A
) was created.

Radiographic films according to the invention (Films 2B% 2C and 2D) similar to Film 1B of Example 1 were prepared. Film 2B has a total silver coating amount of 4.6 1 g/,2
, light-insensitive silver bromoiodide grains per surface 0.1. ! i'/ty
Zinc oxide per t2 surface 0.5. ! i'/m2, and film 2C has a gold/silver coating amount of 4.5 7,! i'
/m2, light-insensitive silver bromoiodide grains per surface 0.1 g/m”
, area b zinc oxide 1 g/m2, and film 2D has a total silver coverage of 4.54 g/rIL2, and a photoinsensitive silver bromoiodide particle per area 0.1 g/rr2 zinc oxide 1.
5. ! It was i'/m2.

Radiographic films according to the present invention (films 2F, 2F and 2G) similar to film 1B of Example 1 were prepared. Film 2E has a gold/silver coating amount of 4.809/m
2. Photoinsensitive silver bromoiodide grains per surface 0.297 m2, zinc oxide per surface 0.59/m2, film 2F
Gold and silver painting 4. 7 6 1/m2, 0-2 g/m2 of photoinsensitive silver bromoiodide grains per surface, 1 zinc oxide per surface,! 9/m", and Film 2G has a total silver coverage of 4.7 1/m", photoinsensitive silver bromoiodide grains D-2 1/m" per surface, and zinc silica L5f per surface.
j/m”.

A radiographic film similar to film 1B of Example 1 (
Films 2H and 2H) were created. It was clear and contained no light-insensitive silver bromoiodide grains. Film 2N has a Zensilver finish of 4.3 3. ! 9/rrL was 1.5.9/m2 of zinc oxide per 2 surfaces, and did not contain light-insensitive silver bromoiodide.

Example 1 after storing the above film sample at 50°C for 15 hours.
The samples were exposed and processed as described in .

The following table shows the results of photographic sensitivity and crossover rate.

It contained lead. Film 2 coating amount is 4
．． 8 5 9 / 77L2, surface di-insensitive silver bromoiodide grains 0.2. ! 9/m2 and did not contain zinc oxide (films 2L, 2M, and 2N).

Film 2L had a total silver coverage of 4.38 g/m'', a surface area of zinc oxide of 0.51/m'', and contained no light-insensitive silver bromoiodide grains. Film 2M has a total silver coverage of 4-339/m2, and a zinc oxide coating of 19 per surface.
/ m259 6th port 2nd Table 4.24 4.61 4.57 4.54 4.80 4.76 4.71 4.59 4.85 4.38 4.33 4.33 2.59 2.62 2 .62 2.68 2.53 2.57 2.61 2.52 2.49 2.71 2.77 2.78 The results show how the radiography of the present invention is advantageous in reducing crossover without losing sensitivity. It shows whether there is.

Claims (1)

[Scope of Claims] (1) A transparent support base coated with a spectrally sensitized silver halide emulsion layer on at least one side, and between the support base and the silver halide emulsion. comprising a hydrophilic colloid layer; the hydrophilic colloid layer (a) having an average particle size of 0.01;
containing substantially light-insensitive, low silver iodide silver bromoiodide grains in the range of ~0.1 μm; and (b) dispersed zinc oxide grains; Spectral sensitizing dye is adsorbed to J
forming bands; the dye adsorbed on the silver bromoiodide grains has an absorption in a region of the electromagnetic spectrum corresponding substantially to the spectral sensitivity of the silver halide emulsion; A light-sensitive silver halide element for use with sensitive screens. 2. A photosensitive element according to claim 1, wherein a transparent support base is coated with spectrally sensitized silver halide emulsion layers on both sides. 3. The photosensitive element of claim 1, wherein the spectral sensitizing dye adsorbed onto the substantially light-insensitive silver halide grains is a cyanine dye. 4. The photosensitive element of claim 1, wherein the dye adsorbed on the substantially light-insensitive silver halide grains exhibits a J-band as a function of absorption with an absorbance of at least 0.30. (5) The dye adsorbed on the substantially light-insensitive silver halide grains has the following general formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, Z_1 and Z_2 are the same) or different elements, each representing an element necessary to complete the nucleus of the ring derived from the basic heterocyclic nitrogen compound; R_1 and R_2 are the same or different groups, and each represents an alkyl group, an aryl group , represents an alkenyl group or an aralkyl group; R_3 represents a hydrogen atom; R_4 and R_5 are the same or different atoms or groups, and each represents a hydrogen atom or a lower alkyl group; p and q
is 0 or 1; m is 0 or 1; A is an anionic group; B is a cationic group; and k and l can be 0 or 1. ) The photosensitive element according to claim 1. (6) The dye adsorbed on the substantially light-insensitive silver halide grains has the following general formula (II) ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (II) (In the formula, R_1_0 is a hydrogen atom or Represents a lower alkyl group; R
_6, R_7, R_8 and R_9 each represent a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group, an amino group, an acylamino group, an acyloxy group, an alkoxycarbonyl group, an alkyl group, an alkoxycarbonylamino group, or an aryl group, or R_6 and R_7 and R_
8 and R_9 can each be atoms necessary together to complete a benzene ring; R_1_1 and R_1_2 each contain an alkyl group, a hydroxyalkyl group, an acetoxyalkyl group, an alkoxyalkyl group, an alkyl group represents a carboxyl group, a sulfo group containing an alkyl group, a benzyl group, a phenethyl group or a vinylmethyl group; X^- represents an acid anion; and n represents 1 or 2. ) The photosensitive element according to claim 1, which is represented by: (7) Substantially light-insensitive silver bromoiodide grains are 0.05 to 1
．． A photosensitive element according to claim 1, wherein the photosensitive element is used in an amount of 0 g/m^2. (8) The dye adsorbed onto the substantially light-insensitive silver halide grains is used in an amount of 25 to 100% of the monomolecular layer coating amount on the surface of the light-insensitive silver halide grains. A photosensitive element according to claim 1. (9) A spectral sensitizing dye adsorbed on substantially light-insensitive silver halide grains is added to the light-insensitive silver halide grains by reaction with a water-soluble iodide salt or bromide salt. 2. The photosensitive element of claim 1, wherein: (10) The photosensitive element according to claim 1, wherein the zinc oxide particles have a particle size of 0.1 to 1 μm. (11) A photosensitive element according to claim 1, wherein the zinc oxide particles are used in an amount of 0.5 to 3 g/m^2. 12. A photosensitive element according to claim 1, wherein the silver halide emulsion layer is spectrally sensitized to green light in the visible spectrum. (13) Spectral sensitization in which the silver halide emulsion layer exhibits a J band as a function of low aspect ratio cubic silver halide grains and absorption having an absorbance of at least 0.5 adsorbed on the surface of the cubic silver halide grains. 2. The photosensitive element of claim 1, comprising a dye. 14. The photosensitive element of claim 16, wherein the spectral sensitizing dye is adsorbed to the surface of the cubic silver halide grains in an amount substantially greater than that which substantially optimally sensitizes the cubic grains. (15) A photosensitive element according to claim 13, wherein the silver halide is silver bromoiodide having an average grain size within the range of 0.2 to 1.5 μm. (16) The photosensitive element according to claim 16, wherein the J-band photosensitizing dye is a cyanine dye. (17) The dye adsorbed on the silver halide grains has the following general formula (I) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (I) (where Z_1 and Z_2 are the same or different elements, Each represents an element necessary to complete the ring nucleus derived from the basic heterocyclic nitrogen compound; R_1 and R_2 are the same or different groups, and each represents an alkyl group, an aryl group, an alkenyl group, or an aralkyl group. represents; R_3 represents a hydrogen atom; R_4 and R_5 are the same or different atoms or groups, and each represents a hydrogen atom or a lower alkyl group; p and q
is 0 or 1; m is 0 or 1; A is an anionic group; B is a cationic group; and k and l can be 0 or 1. ) The photosensitive element according to claim 13. (18) The dye adsorbed on the silver halide grains has the following general formula (II) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (II) (In the formula, R_1_0 represents a hydrogen atom or a lower alkyl group; R
_6, R_7, R_8 and R_9 each represent a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group, an amino group, an acylamino group, an acyloxy group, an alkoxycarbonyl group, an alkyl group, an alkoxycarbonylamino group, or an aryl group, or R_6 and R_7 and R_
8 and R_9 can each be atoms necessary together to complete a benzene ring; R_1_1 and R_1_2 each contain an alkyl group, a hydroxyalkyl group, an acetoxyalkyl group, an alkoxyalkyl group, an alkyl group represents a carboxyl group, a sulfo group containing an alkyl group, a benzyl group, a phenethyl group or a vinylmethyl group; X^- represents an acid anion; and n represents 1 or 2. ) The photosensitive element according to claim 13. (19) The method according to claim 13, wherein the spectral sensitizing dye is adsorbed on the surface of the cubic silver halide grains in an amount 2 to 8 times the amount sufficient to optimally sensitize the silver halide grains. Photosensitive element. (20) The photosensitive element according to claim 13, wherein the spectral sensitizing dye is added to the cubic silver halide grains in conjunction with a water-soluble iodide salt or isobromide salt. (21) Claim 1, wherein the spectral sensitizing dye is added to the cubic silver halide grains in reaction with a supersensitizer.
3. The photosensitive element according to 3. (22) The photosensitive material according to claim 13, wherein the spectral sensitizing dye is added to the cubic silver halide grains in a supersensitizing amount in conjunction with a polymer compound having an amino-allylidene-malononitrile moiety. sexual element. (23) The silver halide emulsion layer is made of tabular silver halide grains having a thickness of less than 0.5 μm, and at least the entire protruding area of the silver halide grains present in the silver halide emulsion layer is 2. A photosensitizer as claimed in claim 1, comprising said tabular silver halide grains of which 35% are of an average aspect ratio of at least 5:1 and a spectral sensitizing dye adsorbed to the surface of said grains. element. (24) The photosensitive element according to claim 26, wherein the spectrally sensitizing dye adsorbed on the surface of the tabular silver halide grains exhibits a J band as a function of absorption having an absorbance of at least 0.5. (25) The photosensitive element according to claim 24, wherein the J-band photosensitizing dye is a cyanine dye. (26) The dye adsorbed on the surface of tabular silver halide grains has the following general formula (I) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, Z_1 and Z_2 are the same or different elements. Each represents an element necessary to complete the ring nucleus derived from the basic heterocyclic nitrogen compound; R_1 and R_2 are the same or different groups, and each represents an alkyl group, an aryl group, an alkenyl group, or represents an aralkyl group; R_3 represents a hydrogen atom; R_4 and R_5 are the same or different atoms or groups, and each represents a hydrogen atom or a lower alkyl group; p and q
is 0 or 1; m is 0 or 1; A is an anionic group; B is a cationic group; and k and l can be 0 or 1. ) The photosensitive element according to claim 23. (27) The dye adsorbed on the surface of tabular silver halide grains has the following general formula (II) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (II) (In the formula, R_1_0 is a hydrogen atom or a lower alkyl group. Representation: R
_6, R_7, R_8 and R_9 each represent a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group, an amino group, an acylamino group, an acyloxy group, an alkoxycarbonyl group, an alkyl group, an alkoxycarbonylamino group, or an aryl group, or R_6 and R_7 and R_
8 and R_9 can each be atoms necessary together to complete a benzene ring; R_1_1 and R_1_2 each contain an alkyl group, a hydroxyalkyl group, an acetoxyalkyl group, an alkoxyalkyl group, an alkyl group represents a carboxyl group, a sulfo group containing an alkyl group, a benzyl group, a phenethyl group or a vinylmethyl group; X^- represents an acid anion; and n represents 1 or 2. ) The photosensitive element according to claim 23. (28) Claim 2, wherein the dye adsorbed on the surface of the tabular silver halide grain is used in an amount of 25 to 100% of the monomolecular layer coating amount on the surface of the tabular silver halide grain.
3. The photosensitive element according to 3. (29) The photosensitive element according to claim 23, wherein the silver halide is silver bromide or silver bromoiodide. (30) (i) at least one spectrally sensitized silver halide emulsion layer coated on at least one side of a transparent support base, and between the base and the silver halide emulsion layer; The hydrophilic colloid layer consists of (a) substantially light-insensitive silver bromoiodide grains having an average grain size in the range of 0.01 to 0.1 μm;
) containing dispersed zinc oxide particles; a spectral sensitizing dye is adsorbed onto the silver bromoiodide particles to form a J band; the dye adsorbed onto the silver bromoiodide particles is (ii) developing the spectrally sensitized silver halide element by exposing it to X-rays through an X-ray intensifying screen; , (iii) fixing with thiosulfate ions, and (iv) washing with water.