SPECTROSCOPIC AND PHOTOGRAPHIC INVESTIGAT IONS ON SIGNAL RECORDING INTHE DIFFUSE BOUNDARY-LAYER SILVER-HALIDE MICROCRYSTAL GELATIN

Nine chemical unsensitized ultra fine grain AgBr gelatin emulsions hav e been made according to a completely orthogonal schedule including th e follow independent variables: gelatin concentration during precipita tion (30-, 60-, 120 g/litre emulsion) and silver halide to gelatin rat io (0.41-, 1.64-, 6,56 10(-4) Mol AgBr/g gelatin). From the nine emuls ions dried layers have been made 0,5 mm thick each. The lavers have be en exposed to flash light (1, 2, 4, 8, 16 and 32 flashes). The effects of exposition, silver halide to gelatin ratio and gelatin concentrati on during the precipitation upon photolysis products have been determi nated by UV-VIS spectroscopy. There are significant differences betwee n the effects of the independent variables upon silver with molecular dispersity (334 nm-, 390 nm-peak) and colloidal silver (470 nm-, 530 n m-peak). At first time a 334 nm-silver cluster peak have been obtained in silver halide gelatin emulsions.