SU1525670A1 - Method for conversion of silver picture on radiographic film - Google Patents

Abstract

The invention relates to a halogen-silver photograph, in particular to a method for converting a silver image on a radiographic film, and can be used in radiography. The goal is to increase photographic sensitivity. To do this, the silver image is bleached in a solution containing cobalt chloride (2 ⁺ ), sodium citrate, citric acid, potassium ferricyanide, methionine and water, fixed in an aqueous solution of sodium thiosulfate and tinted in a solution containing, g / l: dithiooxamide 4, 0-5.0, potassium hydroxide 10.0-15.0, sodium carbonate anhydrous 4.0-6.0 and water to 1 l. The method allows to increase the photographic sensitivity of the film (S _0.85 ) by 1.5-1.6 times (as measured by a blue filter and a concentration of 3.5 versus 5 g / l with a higher level than the present case of the veil) without changes in the mean gradient and level of the veil. 3 tab.

Description

The invention relates to a halogen-silver photograph, namely to processing methods, silver images, and can be used in X-ray diffraction.

The purpose of the invention is to increase the photographic sensitivity.

Example 1. A silver image on a PT-5 film. In the form of a sensitometric wedge obtained as a result of exposure and chemical photographic treatment according to OST 6-17-54-80, is bleached in a solution of the composition, g / l:

Cobalt (II) chloride

hexahydrate. ten ; Sodium citrate

three-substituted 50

6.0

4.0 0.5 To 1

l

Citric acid

Ferricyanide

Kali

Methionine

Water

for 15 minutes, rinse in running water for 3 minutes, fix in a 25% aqueous solution of sodium thiosulfate for 5 minutes at 25 ° C, wash in running water for 3 minutes, then tint in a solution of composition, g / l:

Dithiooxamide

Potassium hydroxide

Sodium carbonate

anhydrous

Water

4.0 10.0

4,0 To 1 l

O1

go ate

within 12 min at 25 ° C, washed

B running water 15 minutes and I will dry out at room temperature.

Example 2. They are made according to the method of example 1, but toning is carried out in a solution of composition, g / L

Dithiooxamide 4,5

Potassium hydroxide 1255

Carbo pc soda

Beevodk.Y5,0

Water up to 1 l

during 14 min at 23 C

Example 3, Carried out according to the scheme of Example 1, but the weighing is in solution of composition, g / l;

Dithisksd-5.0

Potassium hydroxide 15; ABOUT

Sodium carbonate

anhydrous1; nd6,0

Water up to 1 l

within 15 microns npii 20 C.

Example 4 (prototype), Used according to the method of Example 1, but toning is carried out in a solution of the composition, g / l:

D 1thioxamide 2s 5

Potassium hydroxide 15

Sodium carbonate

anhydrous 1st 6,0

Water up to 1 l

within 20 days at C,

Photographic characteristics for all examples are given in table.

To determine the radiographic sensibilities of the rigidity, the 150 / 300-10 installation was used to survey the sensitivity wire ethanols according to GOST 7512-82. Nondestructive control, .. Welded joints. Radiographic method / (focal distance 11QO mm, voltage on an X-ray tube 180 kV, force t 10 mA) 3 translucent materials from a pouzhi. Steel plates ST-3 with a thickness of 115 5 mm.

Processing of the exposed specimens was carried out in the standard way according to GOST 6--17--54-80e and then according to opgos schemes. given in table., 2,

As can be seen from the above data, the radiographic sensitivity of the previous pps method of treatment does not differ from that of the material5

laJ processed by prototype method „

Example 5 (comparative). Carried out according to the scheme of Example 1, but toning is carried out in a solution of the composition, g / l:

Dithiooxamide 3,5

Hydroxide natrn 12,5. d) sodium carbonate

anhydrous5.0

Water up to 1 l

for 14 dan at 23 C.

Example b (comparative). Carried out as in Example 1, but toning is carried out in a solution of the composition, g / l:

Dithiooxamide.

Sodium hydroxide 12.5 d sodium carbonate

anhydrous

Water up to 1 l

for 14b-sn at 23 pp., j

Photographic indicators for 5 of these cases are given in table.3.

Claims (1)

As can be seen from Table 3, the level (and, at condenderadium, 3.5 g / l is lower than for the proposed method, at the same time, at a concentration of 5.5 g / l, the level does not exceed that for confentry 5.0 G / .P (upper proposed limit) with a higher level of the veil. Processing of film B of the proposed conditions leads to an increase in photographic sensitivity of 15-1.5 times A.a. without changing the average gradient and level of the invention. A method of converting silver images on a radiographic film, including bleaching in solution, re-containing cobalt (II) chloride, sodium digrate, citric acid, potassium ferridide, methionine and water, fixed in aqueous solution sodium thiosulfate and toning in a solution containing dithisoxamide hydroxide drip in the amount of 10-15 g / l, anhydrous sodium carbonate in the amount of 4-6 g / l and water, characterized in that, in order to increase photographic sensitivity, dithioxamide in toning the solution is used if ETS 4.0-5.0 g / l. Sample Photographic indicators for blue by filter , 3 0.13 2805.5 0.13 3805.5 0.14 4 (prototype) 505.5 0.12 Silver image before conversion 3.51.5 0.08 ..: Table 2 Example Interval Optical Raft Radiographic Non-Silver Sensitivity images for blueprint GOST 7512-82,% filter 12.5-3.02.22 22.5-3.02.22 32.5-3.02.22 A (prototype) 2,5-3,02,20 Silver image2.5-3.01 s 74 Table 3 Sample Photographic Indicators Radiographic - sensitivity,%  8 D, 763 4.9 0.132.20 880 5.5 0.162.20 Compiled by A.Kruglov Editor A.Revin Tehred M.DidykKorrektor T.Malets Order 7225/43 Circulation 411 Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab.,. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101