三碘化钾对溴碘化银乳剂感光性能的影响

The Photographic Performance of Silver Bromoiodide Emulsions Containing Triiodide

本文比较了在相同的乳化条件下分别使用碘化钾和三碘化钾后乳剂感光性能的差异。同时研究了三碘化钾在卤化银沉淀过程中 ,不同加入时间 ,不同加入量以及三碘化钾溶液内碘化钾和碘组分的摩尔比的改变对乳剂感光性能的影响。结果表明 ,使用三碘化钾溶液可以显著提高乳剂的反差。但是 ,乳剂的反差随着三碘化钾溶液加入位置逐渐靠近表面而不断降低 ,随着碘化钾和碘摩尔比的增加迅速降低。

The photographic properties of silver bromoiodide emulsions were discussed when different methods were applied in adding the potassium triiodide aqueous solution into the reaction vessel during the period of precipitation. The sensitivity and contrast of the two emulsions doped with potassium iodide and potassium triiodide respectively were compared. Triiodide could increase the contrast significantly. The contrast decreased when triiodide was added near the surface of the grain,or when the mole ratio of iodide to iodine increased.