Silver halide photographic emulsion and silver halide photographic lightsensitive material using the same

A silver halide photographic emulsion, wherein at least 70% of the total projected area of silver halide grains contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver iodide content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as I mol %, a silver iodide content of each epitaxial protrusion portion of each grain falls within the range of 0.71 to 1.31, and a silver chloride content of each epitaxial protrusion portion of each grain is 35 mol % or less.

A method of preparing a silver halide photographic emulsion in which at least 70% of the total projected area of silver halide grains contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver chloride content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as CL mol %, a silver chloride content of each epitaxial protrusion portion of each grain falls within the range of 0.7 CL to 1.3 CL, and a silver chloride content of each epitaxial protrusion portion of each grain is 35 mol % or less,

• wherein the method comprises forming epitaxial protrusion portion by adding a silver iodide ultrafine grain emulsion prepared within 10 minutes or less of being added.

A method of preparing a silver halide photographic emulsion in which at least 70% of the total projected area of silver halide grains, contained therein is occupied by silver bromochloroiodide hexagonal epitaxial tabular grains each having (111) faces as main planes and an epitaxial protrusion portion, wherein the epitaxial protrusion portion exists on at least one apex portion of the hexagon, and, when an average silver iodide content of the epitaxial protrusion portions of all the grains having the epitaxial protrusion portion is expressed as I mol %, a silver iodide content of each epitaxial protrusion portion of each grain falls within the range of 0.7I to 1.3I, and a silver chloride content of each epitaxial protrusion portion of each grain is 35 mol % or less,

• wherein the method comprises forming epitaxial protrusion portion by adding a silver iodide ultrafine grain emulsion prepared within 10 minutes or less of being added.