Silver halide photographic emulsion and a photographic light-sensitive material

A silver halide photographic emulsion, in which silver halide grains have been formed while iodide ions are rapidly being generated in a reactor vessel to form a silver iodide-containing region in the silver halide grains, wherein 50% to 100% in number of the silver halide grains are tabular grains having 10 or more dislocation lines per grain at a fringe portion of said tabular grains, and the silver halide grains have been spectrally sensitized by a sensitizing dye represented by the following formula (I):

• ##STR23## wherein each of Z.sub.1 and Z.sub.2 represents a non-metallic group which forms a 5- or 6-membered heterocyclic ring having a nitrogen atom and a carbon atom in the ring, R.sub.3 and R.sub.4 represent alkyl groups, X.sub.1.sup.- represents an anion, and p represents 1 or 2, wherein said iodide ions are generated from an iodide ion-releasing agent of Formula (II) placed in the reactor vessel, 50% to 100% of said iodide ion-releasing agent of Formula (II) completes release of iodide ions within consecutive 180 seconds in the reaction vessel, said iodide ions are generated by a reaction of an iodide ion-releasing agent of Formula (II) with an iodide ion release-controlling agent, wherein said iodide ions are generated from an iodide ion-releasing agent represented by Formula (II):
• R-I (II)
• where R represents a monovalent organic residue which releases iodide ions upon reacting with a base and/or a nucleophilic reagent.