Patent ID: 6686116
Filing Date: 2004-02-03
Classification: G03C,Y10S

Abstract:
A blue-sensitive radiographic silver halide film comprising a support having first and second major surfaces,said radiographic silver halide film having disposed on said first major support surface, one or more hydrophilic colloid layers including a first silver halide emulsion layer, and on the second major support surface, one or more hydrophilic colloid layers including a second silver halide emulsion layer, said first silver halide emulsion layer comprising predominantly tabular silver halide grains that have an aspect ratio of at least 15, a grain thickness of at least 0.1 &mgr;m, and comprise at least 90 mol % bromide and up to 4 mol % iodide, based on total silver halide, substantially all of said iodide being present in an internal localized portion of said tabular silver halide grains that excludes the surface of said grains, wherein said tabular silver halide grains in said first silver halide emulsion layer are dispersed in a hydrophilic polymeric vehicle mixture comprising at least 0.5% of oxidized gelatin, based on the total dry weight of said polymeric vehicle mixture, and wherein said tabular silver halide grains in said first silver halide emulsion layer are spectrally sensitized with a combination of first and second spectral sensitizing dyes that have maximum J-aggregate absorptions on said tabular silver halide grains of from about 380 to about 500 nm, wherein the maximum J-aggregate absorption of said first spectral sensitizing dye is from about 20 to about 50 nm lower in wavelength than the maximum J-aggregate absorption of said second spectral sensitizing dye, the molar ratio of said first spectral sensitizing dye to said second spectral sensitizing dye being from about 0.25:1 to about 1:1, and said first and second spectral sensitizing dyes being present to provide from about 50 to 100% of saturation coverage of said tabular silver halide grains.