カドミウム塩-錫塩共存系焼き出し乳剤の研究 (第1報)
1965 年 28 巻 4 号 p. 179-187
詳細
1965 年 28 巻 4 号 p. 179-187
The print-out effects of siver bromide emulsions containing Cadmium chloride and Stannous chloride for the direct recording of Oscillograph traces were investigated.
The primary exposures were given through a step-wedge with the Xenon flashtube Sensitometer at the times of 10-5, 10-4, 10-3 and 10-2, second. The latent image by the high intensity primary exposure was amplified by the action of secondary exposure light with ordinary white fluorescent lamp to form visible image.
By addition of 30 mol % cadmium chloride and 20-30 mol % stannous chloride (based on silver bromide) to the silver bromide emulsion under the presence of 40 mol % excessive bromide, the threshold speed of the emulsion was remarkably increased and the reciprocity-law failure at low intensity was extremely enhanced. These metallic salts were added to the original silver bromide emulsion after physical ripening without the process of chemical digestion.
It is supposed that stannous chloride contributes to the acceleration of print-out effects by its strong reducing reaction and bromine accepting ability and that cadmium chloride mainly functions as fog inhibiting agent.
