| 摘要 |
PURPOSE: To enhance sensitivity and to reduce fog. CONSTITUTION: The silver halide grains in an emulsion contains a chloride in an amount of 20-100mol% and flat silver halide grains, in an amount of >=60% of the total projection areas, having principal crystal faces 100} and an aspect ratio (diameter/thickness ratio) of 2-30 and an average thickness of 0.05-0.35μm and a ratio of the total projection areas of twin crystals to those of the flat grains of 0-10%, and the silver halide grains are chemically sensitized in the presence of an N-containing heterocyclic compound and the surfaces of the grains are wholly or partially subjected to halogen conversion.
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