Tabularly banded emulsions with high chloride central grain portions

A radiation-sensitive emulsion comprised of a dispersing medium and silver halide grains, at least 70 percent of total grain projected area being accounted for by tabular grains of a face centered cubic crystal lattice structure having parallel {111} major faces, an average thickness of less than 0.2 .mu.m, and an average aspect ratio of at least 5, the tabular grains each being comprised of a central region and a shell differing in halide content, wherein

• the halide content of the central region is at least 70 mole percent chloride,
• the halide content of the shell is at least 70 mole percent bromide,
• the shell is comprised of a band extending laterally outwardly from the central region between the {111} major faces and forming at least 25 percent of the {111} major faces, the band accounting for at least 70 percent of the volume of the shell, and
• the emulsion contains a 4,5,6-triaminopyrimidine, a polyiodophenol or an iodo-8-hydroxyquinoline grain growth modifier.