PROCESS OF MANUFACTURE OF BROMINE-SILVER PHOTOGRAPHIC EMULSIONS FOR RADIOGRAPHY Russian patent published in 1995 - IPC

FIELD: radiography. SUBSTANCE: bromine-silver photographic emulsion is prepared by way of controlled two-jet emulsification with injection into aqueous solution No 1 containing NaF with constant value of pF=1.4-1.78 and pH=4.8-7.0 of aqueous solution No.2 containing NaF and aqueous solution No.3 containing magnesium nitrate, barium nitrate or strontium nitrate in the amount of 0.005-0.5 molecular per cent of content of calcium nitrate or europium chloride in the amount of 0.0001-0.003 molecular per cent of content of calcium nitrate or lead nitrate in the amount of 0.1-3.0 molecular per cent of content of calcium nitrate. Then obtained nuclei are cured by shell of silver bromide by injection of aqueous solution No.4 containing AgNO₃ into suspension with constant value of pBr=1.45-0.55 and pH=10.05-11.05 and aqueous solution No. 5 containing Kbr, by injection of gelatine up to S= 0.38-2.31, later solid phase is separated, washed and precipitate is dispersed in water-gelatine solution and sensitized chemically. In this case sensitivity of control amounts to 2.0-3.5% as compared with 8.5%. EFFECT: increased sensitivity of radiographic control to detection of flaws of materials, units and parts. 2 tbl