High-speed radiographic film

A symmetric radiographic silver halide film having a film speed of at least 750 and comprising a support that has first and second major surfaces,

• said radiographic silver halide film having disposed on said first major support surface, two or more hydrophilic colloid layers including first and second silver halide emulsion layers, and having on said second major support surface, two or more hydrophilic colloid layers including third and fourth silver halide emulsion layers, said first and third silver halide emulsion layers being the outermost emulsion layers on their respective sides of said support,
• each of said first, second, third, and fourth silver halide emulsion layers independently comprising tabular silver halide grains that have the same chemical composition, an aspect ratio of from about 38 to about 45, an average grain diameter of at least 3.5 μm, and an average thickness of from about 0.08 to about 0.14 μm, and comprise at least 95 mol % bromide and up to 1 mol % iodide, both based on total silver in said grains,
• each of said second and fourth silver halide emulsion layers comprising a particulate magenta oxonol dye as a crossover control agent present in an amount of from about 1 to about 1.3 mg/dm2 that is sufficient to reduce crossover to less than 12% and that is decolorized during development within 90 seconds,
• said film further comprising a protective overcoat on both sides of said support disposed over all of said-hydrophilic colloid layers,
• wherein said tabular silver halide grains in said second and fourth silver halide emulsion layers are dispersed in a hydrophilic polymeric vehicle mixture comprising from about 5 to about 15% of deionized oxidized gelatin, based on the total dry weight of said hydrophilic polymeric vehicle mixture,
• wherein the dry, unprocessed thickness ratio of said first silver halide emulsion layer to that of said second silver halide emulsion layer is from about 3:1 to about 1:1, and the dry, unprocessed thickness ratio of said third silver halide emulsion layer to that of said fourth silver halide emulsion layer is independently from about 3:1 to about 1:1, and
• wherein the molar ratio of silver in said first silver halide emulsion layer to that of said second silver halide emulsion layer is from about 1.5:1 to about 3:1, and the molar ratio of silver in said third silver halide emulsion layer to that of said fourth silver halide emulsion layer-is independently from about 1.5:1 to about 3:1.