Iodochloride emulsions containing quinones having high sensitivity and low fog

摘要

The invention relates to a radiation sensitive emulsion comprised of a dispersing medium and silver iodochloride grains   WHEREIN the silver iodochloride grains   are partially bounded by {100} crystal faces satisfying the relative orientation and spacing of cubic grains and   contain from 0.05 to 1 mole percent iodide, based on total silver, with maximum iodide concentrations located nearer the surface of the grains than their center   and wherein said emulsion further comprises a quinone comprising wherein R₁, R₂, R₃, and R₄ may be independently substituted or non-substituted alkyl, aryl, alkylaryl, or halogen, carboxy, amido, cyano, methoxy; together R₁ and R₂, R₃ and R₄ may form carbocyclic, heterocyclic, aromatic, or heteroaromatic rings.