Abstract: A photographic emulsion is disclosed comprised of coprecipitated radiation-sensitive silver halide grains containing greater than 70 mole percent bromide, based on silver, and exhibiting a coefficient of variation of less than 30 percent. Greater than 90 percent of total projected area of the grains is accounted for by tabular grains having {111} major faces, exhibiting a thickness of less than 0.07 .mu.m, and having latent image forming silver salt epitaxy chemical sensitization sites on their surfaces, and a dispersing medium that contains a grain dispersity reducing concentration of a polyalkylene oxide block copolymer surfactant comprised of two terminal lipophilic alkylene oxide block units linked by a hydrophilic alkylene oxide block unit accounting for from 4 to 96 percent of the molecular weight of the polymer.

Abstract: A radiographic element is disclosed in which from 10 to 60 percent of total silver forming the spectral sensitized silver halide grains is provided by one or more ultrathin tabular grain emulsions. It has been discovered that by limiting the proportions of ultrathin tabular grains desirably cold image tones can be obtained while improving other performance characteristics, including achieving significant reductions in crossover.