Importance

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Abstract

A radiation-sensitive emulsion comprised of high chloride silver halide grains having a central portion accounting for up to 99 percent of total silver and containing a first dopant of Formula (I): [RuL.sub.6].sup.n wherein n is -2, -3 or -4, and L.sub.6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; and a second dopant comprising an iridium coordination complex having ligands each of which are more electropositive than a cyano ligand; wherein the first dopant and the second dopants are located together in a common dopant band in an interior shell region of the central portion of the silver halide grains that surrounds at least 70 percent of the silver and, with the more centrally located silver, accounts for 90 percent of the silver halide forming the grains, and wherein the second dopant is present in the silver halide grains in a concentration of at least 10.sup.-7 mole/mole of total silver. The combination of first and second dopants in a common dopant band provides greater reduction in reciprocity law failure than is achieved with such dopants in separate bands, and also provides improvements in speed and contrast properties.

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First Claim