Radiography in Modern Industry - Kodak

KODAK Hypo Test Solution HT-2Avoirdupois, U.S. LiquidMetricWater 24 fl oz 750 mLKODAK 28% Acetic Acid 4 fl oz 125.0 mLKODAK Silver Nitrate(Crystals)1 / 4 ounce 7.5 gramsWater to make 32 fl oz 1.0 litre1 To make approximately 28% acetic acid from glacial acetic acid, dilute 3 parts of glacial aceticacid with 8 parts of water.Store the solution in a screw-cap or glass-stoppered brown bottle away from strong light. Avoidcontact of test solution with the hands, clothing, negatives, prints, or undeveloped photo- graphicmaterials; otherwise, black stains will ultimately result.The KODAK Hypo Estimator consists of four color patches reproduced on a strip of transparentplastic. It is used in conjunction with KODAK Hypo Test Solution HT-2. For use in the test, anunexposed piece of film of the same type is processed with the radiographs whose fixer contentis to be determined. After the test film is dried, one drop of the KODAK HT-2 Solution is placed onit and allowed to stand for 2 minutes. The excess test solution is then blotted off, and the stain onthe film compared with the color patches of the KODAK Hypo Estimator. The comparison shouldbe made on a conventional x-ray illuminator. Direct sunlight should be avoided since it will causethe spot to darken rapidly.For commercial use, the test spot should be no darker than two thicknesses of Patch 4 of theHypo Estimator. Two thicknesses can be obtained by folding the estimator along the center of thepatch.Storage ConditionsThe residual fixer concentration for commercial use can generally be tolerated in areas where theaverage relative humidity and temperature in the storage space are not excessive. Thesequantities may, however, be excessive when storage conditions are worse than average fortemperature and humidity. Archival processing should be the rule whenever it is known thatrelative humidity and temperature are likely to be constantly excessive, as is the case in tropicaland subtropical areas.Silver Recovery From Fixing SolutionsSilver recovery is both a significant means of conserving a natural resource and a potentialsource of revenue for users of radiographic products. Kodak silver recovery equipment consistsof two simple, nonmoving parts: the KODAK Chemical Recovery Cartridge, Type 1-P, and theKODAK Circulating Unit, Type P. This equipment is specifically designed for the removal of silverfrom the overflow streams of automatically replenished processors. It is, however, equallyadaptable for use with batch replenishment or hand-processing tanks. The equipment is low incost, requires only simple nonelectrical installation, and operates at high efficiency (99 percentrecovery). There is very little maintenance required.A single cartridge is sufficient to handle the fixer overflow in almost every instance. The cartridgeis connected by means of a flexible plastic tube to the fixer overflow line of a KODAKINDUSTREX Processor or to a storage tank. Simple records of the quantity of fixer andreplenisher used are all that need be kept. The exhaustion point of the cartridge is determined bythe use of test papers.Radiography in Modern Industry 139