关键词: 银成核过程, 灰雾形成, 临界尺寸

Abstract: The influence of the amount of developing agent contained in developer on the nucleation rate and the dispersity of nucleus was investigated.The results show that the nucleation rate decreases and the number of nucleus on single emulsion grain increases with decreeing amount of developing agent.It implies the differences in mechanism between the two processes,of which one is silver nucleation in developer and the other is latent-image formation.Some principle problems concerning photographic development,such as,developability,critical size and development selectivity are discussed.

Key words: Silver nucleation, Fog formation, Critical size