JPH01138277A - Water-color ink composition for transferring data onto x-ray photography - Google Patents

Abstract

PURPOSE:To obtain the title composition which is water-based and is excellent in safety, writability and storage stability, by dissolving a specified X-ray screening agent and a dye having a sulfonate group in the molecule in an aqueous solvent. CONSTITUTION:An X-ray screening agent (A) (e.g., Cs2WO4) which is a simple substance or compound of an element having an atomic number >=47 (except rare gas elements) in such an amount that the mass absorption coefficient with respect to X rays of a wavelength of 0.1Angstrom may be 0.170cm<2>/g or higher and 0.001-2.0wt.% dye (B) (pyranine) which is a dye having a sulfonate group in the molecule and has an MW per sodium sulfonate group (said sulfonate group is a sodium sulfonate group) are dissolved in an aqueous solvent (C) comprising 10-80wt.%, based on the obtained composition, water (a) and 1-50wt.%, based on the obtained composition, water-miscible organic solvent (b) (e.g., ethylene glycol).

Description

[Detailed Description of the Invention] The present invention is based on the children's picture book ■Kuho Koka. Regarding the colored water-based ink composition for imprinting data on photographs, for example, write the required data on paper, woven fabric, non-woven fabric, etc., stick it on an X-ray photographic film, and take an X-ray photograph. The present invention relates to a colored aqueous ink composition for imprinting the data on an X-ray photograph.

When an X-ray photograph of the human body or other body is taken, the date of the photograph, the name and gender of the person being photographed, and other necessary data are usually imprinted on the film at the same time. For this purpose, a method has conventionally been adopted in which single-character lead characters, which are difficult to transmit through X-rays, are manually arranged and attached to one corner of the film cassette. However, when using this method, the work of arranging single-character type is extremely complicated, and the amount of data for imprinting is naturally limited.

Also known is a data imprinting device in which a lead foil serving as a writing surface is exposed and the lead foil is held between films.

To use this device, writing is done on the lead foil, that is, the lead foil is scraped off, which makes it somewhat easier to write on, but since the area covered with lead foil unnecessarily blocks X-rays, X-ray photography There are many parts of the film that cannot be used.

Therefore, for example, in Japanese Patent Publication No. 62-27704,
A paste-like paint is prepared by mixing fine powder of lead compounds such as lead oxide, white lead, and lead sulfide with a quick-drying binder.
For example, a method has been proposed in which required data is written on each folded piece of paper using the above-mentioned coating material so that a double copy is obtained after imaging, and this is pasted onto an X-ray photographic film.

However, even when using this method, it is not easy to write the data in such a way that it is exactly duplicated.
Furthermore, since the paint is a paste containing fine powder of a lead compound, the fine powder tends to settle, requiring stirring immediately before use, or requiring a special tool for writing, and furthermore, it has poor writability. Inferior. Furthermore, the paint tends to dry out during storage, has poor storage stability, and is easily flammable, resulting in a lack of safety.

5 points that Ming attempts to solve The present invention was made to solve the above-mentioned problems in the conventional method of imprinting data on X-ray photographs, and is water-based and highly safe. , and has excellent writability and storage stability, allowing for easy and smooth writing even with a normal marking pen, for example,
An object of the present invention is to provide a colored aqueous ink composition for imprinting data onto colored X-ray photographs.

The colored aqueous ink composition for imprinting data on X-ray photographs according to the present invention is a composition for imprinting data on X-ray photographs, in which a simple substance or a compound of an element having an atomic number of 47 or more (excluding rare gas elements) is used. As a radiation shielding agent, the mass absorption coefficient for X-rays at wavelength 0.1 is 0.170c.
Dissolved in an aqueous solvent to a concentration of nl/g or more, and
A dye having a sulfonate group in its molecule, characterized in that it is obtained by dissolving a dye having a molecular weight of 250 or less per sodium sulfonate group when the sulfonate group is a sodium sulfonate base. .

In general, the intensity ■ after an X-ray with intensity I0 passes through a material with thickness d (am) is the density of the material ρ (g/cnt)
When, In (I./I) = l' 9 d (1
) or 1 = To exp(-μ9 d) <2)
holds, where ρμ(cm-') is the linear absorption coefficient of the material for X-rays, and μ(cut/g) is the X-ray absorption coefficient of the material.
It is defined as the mass absorption coefficient for a line.

This mass absorption coefficient is a unique value that each element constituting a substance has when the wavelength of X-rays is determined, and it is known that compounds and mixtures have additivity. That is, when the mass absorption coefficient of each component element constituting a compound or mixture is μ4, the weight ratio is W, and the density of the compound or mixture is ρ, the mass absorption coefficient μ of the compound or mixture is, μ= It can be determined by Σμm1.

The ink composition according to the present invention uses an element or a compound of an element having an atomic number of 47 or more (excluding rare gas elements) as an X-ray shielding agent, and has a mass absorption coefficient of 0.1 for X-rays at a wavelength of 0.1. It is dissolved in an aqueous solvent so that the amount is 170 cut/g or more.

According to experiments conducted by the present inventors, in taking X-ray photographs,
Lead foil with a thickness of 0.011 mm or more is effective for shielding X-rays.

In the ink composition according to the present invention, the wavelength of 0.1
Its mass absorption coefficient for the line is 0°170CIIl/g
The above means that the ink composition has an X-ray shielding effect almost equivalent to that of a lead foil having a thickness of 0.01×1 or more, that is, a mass absorption coefficient for X-rays. However, in the present invention, the mass absorption coefficient of the ink composition ignores the X-ray shielding effect of components other than the X-ray shielding agent.

On the other hand, when the X-ray shielding power is μρd in the above formula (1), the X-ray shielding effect of lead foil with a thickness d of O, Q O1 cm is given by the mass absorption coefficient μ of lead being 3.41 cnf/g and the density Since ρ is 11.34 g/cJ, μρd is approximately 0.
It is 039.

Therefore, if the density of the ink composition according to the present invention is at least 1.1 g/cm2 (actually, it is higher in most cases), it is possible to write with the ink composition on an absorbent writing surface, for example, paper. In order to make the X-ray shielding power of the handwriting 0.039, the thickness t of the handwriting is t = 0.0 3 9/ (0,170X 1
．． 1) #2.1 (+w grave). The mass absorption coefficient of the ink composition is 0.170cn! /g, the required thickness of handwriting becomes smaller.

For example, the mass absorption coefficient of the ink composition is 0.5cn! /
When g, the required thickness of the handwriting is approximately 0.7 tsuru.

Such a required thickness of handwriting can be easily obtained by selecting the viscosity and permeability of the ink composition, the permeability of the writing surface, and the like.

The following can be exemplified as elements constituting a simple substance or a compound that can be preferably used in the present invention. However, the value in parentheses indicates the mass absorption coefficient (c4/g) of the element for x'ft1A at a wavelength of 0.1.

8g(1,05), Cd(1,10), In(1,
15), 5n(1,20), 5b(1,25), T
e (1, 30), I (1, 36), C5 (1, 48)
, Ba(1,53), La(1,60), Ce(1,6
6), Pr (1, 72), Nd (1, 80), Pm
(1,86), Sm (1,93), Eu (2,02)
, Gd (2,09), Tb (2,18), Tm (2,
50), Lu (2, 66), Hf (2, 75), Ta
(2,82), W (2,90), Re (2,96)
,05(3,03),rr(3,10),Pt(3,
17), Au(3,23), Hg(3,30), TI
(3,36), Pb (3,41), Bi (3,45)
, PO (3,52), Er (2,42), Ra (3,7
0), Ac (3,75), Th (3,81), Pa (
3,86) and U(3,91).

In the present invention, the X-ray shielding agent preferably has a solubility in water of about 10% by weight or more. Therefore, examples of the above-mentioned single substances or compounds that can be used as the X-ray shielding agent in the present invention include AgFlAgN (h, Cd
1Z, Cd (NO3) z・4H20,3CdSO4
・4H, O.

5nC1z, NH45nBr41HzO1NHaSnC
1:+, SbF3.5bC1t, K3SbS4・5Hz
O1 (NH4): +5bS4, Li5bSt・10H
zO1TeBr4, HzTe04'2HzO1XzTe
04, I2% old, Lil・3HzO, ZnIz, CaI
z, NH4, I, NaI, Kl, Li(1(h), Mg
rz・8Hzo, ICN, C3ZCO3, CsI, C
sC1,,Cs0tl,C3N:+,Cs,SO,,C
szMoOns C52Se04, BaBr,,Ba
(CN) z, Ba(CIOi)z・HzO, Ba1z
・2HzO1BaC1z, Ba (C1o4)z, Shia
z(SeOm)z, La(NO3)+・68zO1L
a (BrO*)3, Mg:+Laz(NOz)Iz1
(NHt)zLa(NOz)s, CeCI 3, Cez
(SOn)s42HzO1MgCez (NO3) I
z, Mg1Prz (No: l) Iz, MnzPrz
(NOz) + 2, PrC134HzO1Pr(N
O3)s, Pr(Br(h)+, MgJdz(NO3)
Iz, MnJdz (NO3) Iz, Ndz (Seda
):l, KNd(SeOa) z・4HzO1SmC1
:+, Sm(Br(h):+, Tb(BrO':+)
x, (Nut)zHfFa, TaF,, Nazkai 04
, K2WO4, C32WO (NHn) JO4, C5
z(WOn), NHaReO+S1MgPt(CN)4
, PtC1,,5H2O1 with zP t (CN) a,
AuCl3, NaAuC14・2H20, KAuCl4
5 LiAuC14, Hg (CN)z, Hg z (
C10t) z, HgN0. , H2O, TICh・4H
zO2TIH,PO,,TIN(h,'rlOH,Pb
C1, Pb (C1Oz)z・H,01Pb (NO3)
2, PMClot)z・3HzO1PbSiF6,I
nBr+・5H2O1rn1. , InC1: +4Hz
O1RaBr,, RaC1z, VOzCh・38zO1
VOz(N(h)z, 6Hzo, Erz(Son)s・
8Hzo, Gd (BrO3) :l ・9H20, N
Examples include H4Re0sS.

As mentioned above, in the ink composition according to the present invention, the above-mentioned single substance or compound has a mass absorption coefficient of 0.1700 for X-rays having a wavelength of 0.1.
It is dissolved in an aqueous solvent so that the amount is J/g or more, but usually,
In the ink composition, it is contained in a range of 10% by weight or more. Preferably, the X-ray shielding agent has a mass absorption coefficient of 0.5 for X-rays with a wavelength of 0.1 in the ink composition.
cn! /g or more. Therefore, the upper limit of the amount of the X-ray shielding agent to be blended is not particularly limited up to its saturated dissolved amount, but is usually 60% by weight or less. The above-mentioned single substances or compounds may be blended into the ink composition alone or as a mixture of two or more.

In the ink composition according to the present invention, water is used as the main solvent, and water is used to adjust the solubility of each component of the ink composition in addition to water, or to penetrate into the absorbent writing surface to which the ink composition is applied. lower aliphatic alcohols such as methanol, ethanol, isopropanol, funnel oil, glycerin, ethylene glycol, propylene glycol, butanediol as a co-solvent and/or moisturizer to adjust properties or suppress water evaporation rate; , hexylene glycol,
Glycols such as diethylene glycol, cellosolve,
Water-miscible organic solvents such as glycol monoethers such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, butyl calpitol, and propylene glycol monomethyl ether are used. Water as a main solvent is usually contained in an ink composition in an amount of 10 to 80% by weight, although it depends on the X-ray shielding agent used. The organic solvent is
It is usually contained in a range of 1 to 50% by weight.

In the present invention, among the above-mentioned X-ray shielding agents, an alkali metal tungstate or ammonium tungstate represented by the formula - (wherein M represents an alkali metal or ammonium) is particularly preferably used. Preferred specific examples of such tungstates include, for example, Na
Mention may be made of 2WO4, K2WO4 and C5zWL. These may be used alone or as a mixture, and may also be used as a mixture with other single substances or compounds as described above.

In particular, the above-described alkali metal tungstates and ammonium tungstates have significantly lower toxicity than other heavy metal salts, and have a large mass absorption coefficient for X-rays of 0.1. For example, Bar, ・2]1
□0 means that the mass absorption coefficient of that 0.1 person for X-rays is 1
．． 31 cnl/g, but that of Na2WO,.21hO is 1.68 cnl/g, that of KzWO4 is 1.72 cnl/g, and that of C5zWO4 is 1.82 cnl/g.

In such an ink composition, the alkali metal tungstate is preferably dissolved in an amount of 15% by weight to less than the saturated amount, particularly preferably 20 to 60% by weight.

Furthermore, preferred ink compositions according to the invention contain an alkali metal base and/or an alkali metal iodide together with the alkali metal tungstate. Ammonia can also be used instead of the alkali metal base.

These alkali metal bases, ammonia, or alkali metal iodides enhance the solubility of tungstate salts in aqueous solvents or enhance the dissolution stability, and are therefore used as dissolution aids for X-ray shielding agents.

The alkali metal base is preferably a strongly alkaline substance, with hydroxides such as sodium hydroxide, potassium hydroxide, cesium hydroxide, and lithium hydroxide being particularly preferably used. However, carbonates and hydrogen carbonates such as sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, and cesium carbonate may also be used. The amount of these alkali metal bases or ammonia blended in the ink composition may be any amount sufficient to make the ink composition alkaline. Therefore, although it depends on the alkali used, the amount of the alkali metal base or ammonia in the ink composition is usually 0.01 to 2゜0% by weight,
Preferably it is in the range of 0.05 to 0.5% by weight. However, when cesium carbonate is used, cesium carbonate is
Since it itself functions as an X-ray shielding agent, it is used in an ink composition in an amount of 40% by weight or less, preferably 30% by weight or less.

As the alkali metal iodide, for example, sodium iodide, potassium iodide, cesium iodide, etc. are preferably used. The amount of these alkali metal iodides in the ink composition may be equal to or less than the saturated dissolved amount.
The amount is usually 40% by weight or less, preferably 30% by weight or less.

Moreover, in the present invention, in addition to the above-mentioned tungstate, 8gNo, , Zn12, BaIz・28zO
.

5bCI+,)IgNO+・1lzo, PbCl,,K
1. , Nal, CsL, CsCO3, CsOH, etc. are preferably used.

When containing barium iodide or zinc iodide as an X-ray shielding agent, hydrochloric acid is added to the ink composition in an amount of about 0.01% by weight or less to stabilize the solubility of these in water. It is preferable to coexist with an inorganic acid such as or an organic acid such as acetic acid.

In the ink composition according to the present invention, when barium iodide, zinc iodide, or the like is used as an X-ray shielding agent, a portion of iodine is liberated and the ink composition is colored. The ink composition can also be colored by adding iodine to an iodine salt such as potassium iodide or sodium iodide. Furthermore, when iodine or an iodine compound is used as the X'fa shielding agent, starch may be added as a coloring agent.

However, the coloring of ink compositions by iodine itself tends to fade or become colorless over time.
It is not necessarily preferable as a coloring agent. On the other hand, when the aforementioned tungstate is used as an X-ray shielding agent, iodine does not dissolve in a concentrated aqueous solution of tungstate. Furthermore, even if an iodine salt such as sodium iodide and iodine are added to a concentrated aqueous solution of tungstate, it will eventually become colored, but over time, the coloring caused by iodine will disappear and eventually It becomes completely colorless.

Therefore, according to the present invention, the coloring agent is a dye having a sulfonic acid group in the molecule, and when the sulfonic acid group is a sodium sulfonate group, the molecular weight per sodium sulfonate group is 250 or less. A certain dye is used. Such dyes unexpectedly dissolve relatively well in ink compositions containing high concentrations of X-ray shielding agents to provide uniformly colored ink compositions. The ink composition according to the present invention contains the above-mentioned X-ray shielding agent dissolved in a high concentration, but the dye can uniformly color the ink composition in a dissolved amount that does not cause salting out. .

In the present invention, dyes having a sulfonic acid group include, for example, dyes having a sulfonic acid group in the form of alkali metal salts such as lithium, sodium, potassium, etc., amine salts such as ethanolamine salts, and ammonium salts in the molecule. is preferably used.

Such dyes include, for example, Acid Yellow 9, Hood Yellow 3, Acid Orange 10, Acid Red 1, Acid Red 18, Acid Red 26, Acid Red 27, Acid Red 35,
Direct Yellow 11 Direct Yellow 50.
Direct Red 80, Direct Blue 25, Direct Proof 1, Direct Black 74, Direct Black 75.4-Sulfonated Nigrosine,
Examples include pyranine.

In addition, in the present invention, as a coloring agent, - formula (in the formula, SO: 1M is an alkali metal base of sulfonic acid,
i) Indicates a base or ammonium base, R1 and R2
are the same or different H acid residue, K acid residue, J
Acid residue, G acid residue, - group represented by the formula (SO3M is the same as above), or (SOJ is the same as above, R3 represents water M group or amino group, R4 is hydrogen, alkyl Dyes represented by )) are also preferably used.

In the above formula, when M is an alkali metal, it is preferably potassium or sodium, and when R4 is an alkyl group, halogen or alkoxy group, it is preferably a methyl group, chlorine or methoxy group, respectively.

In the ink composition according to the present invention, since inorganic salts are dissolved in a high concentration, some dyes are salted out in an aqueous solution, but the above dyes are not salted out and are injected in a relatively large amount into the ink. It can be dissolved in the composition.

Such dyes are usually used in an amount of 0.00 in the ink composition.
1-2.0% by weight, preferably 0. OQ 1~1゜0
It is dissolved in a range of % by weight. If it is too small, it will not be enough to color the ink composition, and on the other hand, if it is too large, it will be salted out and the X-ray shielding agent will be taken in during the salting out. This is not preferable because it may precipitate or form a salt with the active ingredient of the X-ray shielding agent.

The above dye can be used as a solvent, especially aliphatic lower alcohols having 4 or less carbon atoms such as methanol, ethanol, and isopropanol, ethylene glycol, propylene glycol, butanediol, xylene glycol, glycerin,
Trimethylolpropane, 3-methylpentane-1,3
, 5-) C2-9 aliphatic dihydric or trihydric alcohols such as diols, ethylene glycol monomethyl ether, 3-methyl-3-methoxybutanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, Methyl calpitol, ethyl calpitol,
0.1 to 20% of one or more mixtures of alcohol ethers having 3 to 9 carbon atoms such as butyl calpitol;
Preferably, it is used in an amount of 0.5 to 10% by weight.

The ink composition according to the present invention may further contain additives such as surfactants, rust preventives, and preservatives in addition to the above-mentioned components. Examples of the surfactant include anionic surfactants such as sodium dialkyl sulfosuccinate, sodium alkylbenzenesulfonate, and lead naphthenate, or nonionic surfactants such as polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl ether, and polyoxyethylene alkyl ester. Surfactants are preferably used. Also preferably used are acetylene glycols such as 2,4,7.9-tetramethyl-5-decyne-4,7-diol, and ethylene oxide adducts thereof.

Moreover, as a rust preventive agent, for example, 1,3.5-benzotriazole can be used, and as a preservative, for example, tetrabutyltin, sodium benzoate, etc. can be used.

The ink composition according to the present invention can be easily manufactured by dissolving each of the above-mentioned components in water. However, the required components may also be formed in the solvent by chemical reactions in an aqueous solvent. For example, barium iodide is produced by reacting barium hydroxide with hydrogen iodide in an aqueous solvent, and an ink composition using this as an X-ray shielding agent can be obtained.

In addition, the alkyl metal tungstate itself may be dissolved in water, but for example, by dissolving sodium carbonate or potassium carbonate and cesium tungstate in water, tungstate can be dissolved on the spot. Sodium or potassium tungstate may also be produced.

When the ink composition according to the invention contains a solubilizing agent for an X-ray shielding agent as described above, such an ink composition is preferably prepared by first dissolving the solubilizing agent in water and then dissolving the solubilizing agent in water. It is manufactured by dissolving the dye and other additives after dissolving the screening agent.

The ink composition according to the present invention, especially when it contains an iodide such as barium iodide, zinc iodide, calcium iodide, etc. as an X-ray shielding agent, after its preparation, the ink composition is exposed to air. It absorbs carbon dioxide gas and reacts with iodine compounds to liberate hydrogen iodide and may produce water-insoluble carbonates. However, if there is no particular problem in writing, an ink composition such as E can also be used. Of course, the ink composition may be prepared by filtering off the insoluble carbonate.

As mentioned above, the ink composition according to the present invention may contain by-product water-insoluble compounds in some cases, but in most cases it is a colored aqueous solution with a wavelength of 0.1
The mass absorption coefficient for human X-rays is 0.170cn!
/ g or more, so by writing the necessary data on a liquid-absorbing sheet and pasting it on a dry plate containing an X-ray photographic film, at the same time as taking an X-ray photograph,
This data can be imprinted onto film.

Moreover, since the ink composition according to the present invention is colored, when necessary data is written on a liquid-absorbing sheet, by making the density of the handwriting more than a predetermined level, it is possible to imprint it onto the film. The concentration can be reliably increased.

Furthermore, since the ink composition according to the present invention is substantially an aqueous solution, it can be used for writing using conventional and ordinary writing instruments. Examples of such writing instruments include marking pens, felt-tip pens, water-based ballpoint pens, brush pens, and fountain pens.

Examples of the liquid absorbent sheet include paper, woven fabric, nonwoven fabric, foam, and the like. In this way, by using a liquid-absorbing sheet as a writing surface, the ink dries easily, and an ink layer is formed over the thickness of the sheet to ensure that written data is imprinted. Can be done.

However, it is not preferable to use a sheet made of non-liquid-absorbing glass, resin, metal, or the like as a writing surface, since data imprinting becomes uncertain.

As described above, the ink composition for imprinting data on Xb\ photographs according to the present invention can be easily and smoothly written on, for example, with an ordinary marking pen, and furthermore, It is colored, highly safe, and has excellent preservability.For example, the required data is written on paper, woven fabric, non-woven fabric, etc., and this is pasted on X-ray photographic film. Once the X-ray image is taken, the data can be reliably imprinted on the X-ray image at the same time.

15■ A water-based ink composition having the composition shown below was prepared.

The blending amount is expressed in parts by weight.

El earth law bottom imperial land AgN0. 50 parts water 45
Part glycerin 4.5 parts Ink violet 3osl) 0.5 s Mass absorption coefficient 0.359cm2/gC3GO360 parts Water 39.98
Part pyranine” 0.02
Partial absorption coefficient 0.740CJ/g
46 parts NaI 4 parts water 49.97
Sunset Yellow FCF” 0.03
Partial absorption coefficient 0,617cnf/
g soil, soil, soil, soil, soil, NazWOa・2Hz0 25 parts KI 25 parts water 45
Part ethylene glycol 4 parts Nigrosine R455° 49.97 Part type absorption coefficient 0.730cm2/g Ink set 1 Balz・2Hz0 65 parts Water 30
Hydrochloric acid 0.002 parts Propylene glycol 4.988 parts New Coccin 5) 0.01 Partial type absorption coefficient 0.858 cflI/g
J Samdan 5bC1ff 42 part water 53
Part Isopropanol 4.88 parts Nirapon New Blue 5BS'1 0.02 parts Surf Inol 61" 0.1 Part type absorption coefficient 0.314 col/g Soil ■Bottom Stand Nal 50 parts KI 3 parts Water 46.9
Part Water Yellow! lh 6 ” 0
．． 1 Partial absorption coefficient 0.622
cnl/gel Tonagi Toyoko HachigNo.
50 parts water
45 parts glycerin 4.98 parts pyranine
0.02 Part 1 absorption coefficient
0.359cal/gel Soil Sokoharuyu KI 46 parts NaI 4 parts Water 49.8
Nigrosine R4550, two-part type absorption coefficient 0.617Cn! /g Otsu l soil ■ 把 rise degree C3zWO 460 parts KOJI 0.1 part water 35
Part Ethylene Glycol 4.895 parts Food Red No. 106" 0.005 parts Mass Absorption Coefficient 1.072 cbo/g Ink Composition 11 NazWOn-2Hz0 30 parts KI 25 parts Water 40
Part hexylene glycol 4.96 parts Direct Fast Yellow Special I01 0.04 Part type absorption coefficient 0.814cnt/gBa1z4Hz0 65 parts Water 30
Hydrochloric acid 0.01 parts Diethylene glycol monomethyl ether 4.95 parts Water Yellow Fish 6 0.04 Partial type absorption coefficient 0,858 cJ/gFu2 Tonori Bobura Toshu Kl 48 parts Water 51.8
Part Eosin I+1 0.2
Partial absorption coefficient 0.595cJ/
gFuZ full assembly bottom standing soil Cs, Wo, 55 parts Csl 7 parts KOHO, 2 parts water 32.77
Part ethylene glycol 5 parts Pyranine 0.03 For all ink compositions with a partial absorption coefficient of 1.100 c/g or more, write the letters on a piece of paper and paste it on a dry plate containing an X-ray photographic film. When an X-ray photograph was taken, the letters were clearly imprinted on the film.

(Note) 1) Chuo Gosei Kagaku ■2) C, l Solvent Green 73) Hodogaya Chemical Co. (Kugu C,1, Hood Yellow 3) 4) Orient Chemical ■ C, R, Acid Black 2 5 ) C, R, Acid Red 18 manufactured by Hodogaya Chemical Industry ■ 6) C, 1, Direct Blue 25 manufactured by Sumitomo Chemical Company 7) Acetylene alcohol surfactant manufactured by Nissin Chemical Industry (2) 8) Orient Chemical Made by ■9) Cd, Acid Red 52 made by Hodogaya Chemical Industry (+1) 10) C, R, Direct Ye made by Mitsubishi Kasei ■11)
Hodogaya Chemical Industry (+2) C, 1, Acid Red 8
7 Patent Applicant Sakura Crevasse Co., Ltd. Agent Patent Attorney Itsu Makino

Claims (1)

[Claims] (1) Using an element or a compound of an element with an atomic number of 47 or more (excluding rare gas elements) as an X-ray shielding agent with a wavelength of 0.1
The mass absorption coefficient for X-rays in Å is 0.170 cm^2/
A dye that dissolves in an aqueous solvent in such a way that it has a molecular weight of 250 or less, and has a sulfonic acid group in the molecule, and when the sulfonic acid group is a sodium sulfonate base, the molecular weight per sodium sulfonate base is 250 or less. 1. A colored aqueous ink composition for imprinting data on an X-ray photograph, which is formed by dissolving a dye.