Silver halide photographic material

Abstract

A silver halide photographic material which comprises a support having thereon at least one silver halide emulsion layer, wherein silver halide grains to be contained in the silver halide emulsion layer have a silver iodide content lower than 1 mol %, and the silver halide emulsion contains 3.0×10 -3 to 2×10 -2 mol of a thiocyanate per mol of silver halide. In addition, a photographic silver halide emulsion comprising silver halide grains wherein said silver halide grains have an average silver iodide content lower than 1 mol %, and deposited on the surface of the silver halide grains is at least 2×10 -3 mol, but less than 2×10 2 mol of a thiocyanate per mol of silver halide.

What is claimed is: 
     
       1. A photographic silver halide emulsion comprising silver halide grains, wherein said silver halide grains have a silver chloride content of 10 mol % or less, and have an average silver iodide content of at least 0.01 mol %, but lower than 0.3 mol %, the outermost surface of the silver halide grains contains silver iodide, and deposited on the surface of the silver halide grains is at least 2×10 -3  mol, but less than 2×10 -2  mol, of a thiocyanate per mol of silver halide. 
     
     
       2. A photographic silver halide emulsion as in claim 1, wherein thiocyanate is contained in a binder in the silver halide emulsion in an amount of not more than 3.0×10 -3  ml per mol of silver halide. 
     
     
       3. A photographic silver halide emulsion as in claim 1, wherein said silver halide emulsion is prepared by maintaining pBr at a value of 2.5 or higher during formation of the silver halide grains. 
     
     
       4. A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, said silver halide emulsion layer comprises silver halide grains having an average silver iodide content lower than 1 mol % and contains at least 3.0×10 -3  mol, but less than 2×10 -2  mol of a thiocyanate per mol of silver halide. 
     
     
       5. A silver halide photographic material as in claim 6, wherein said thiocyanate is deposited on the surface of the silver halide grains in an amount of at least 2×10 -3  mol, but less than 2×10 -2  mol per mol of silver halide. 
     
     
       6. A silver halide photographic material as in claim 4, wherein the thiocyanate is contained in a binder in the silver halide emulsion in an amount of not more than 3.0×10 -3  mol per mol of silver halide. 
     
     
       7. A silver halide photographic material as in claim 4, wherein the silver halide emulsion contained in said silver halide emulsion layer is prepared by maintaining pBr at a value of 2.5 or higher during formation of the silver halide grains. 
     
     
       8. A silver halide photographic material as in claim 4, wherein the silver halide grains have an average silver iodide content which is lower than 0.3 mol %. 
     
     
       9. A silver halide photographic emulsion as in claim 4, wherein the silver halide grains have an average silver iodide content of at least 0.01 mol %, but lower than 0.3 mol %, and the outermost surface layer of the silver halide grains contains silver iodide. 
     
     
       10. A silver halide photographic material as in claim 4, wherein at least one compound represented by formula (IV) or a precursor thereof is contained in at least one of the silver halide emulsion layer(s) and a hydrophilic colloid layer:   Z--SM                                                      (IV)     wherein Z represents a heterocyclic ring to which at least one of --SO 3  M, --COOR 1 , --OH and --NHR 2  is bonded directly or indirectly; M represents a hydrogen atom, an alkali metal, a quaternary ammonium group or a quaternary phosphonium group; R 1  represents a hydrogen atom, an alkali metal or an alkyl group having 1 to 6 carbon atoms; R 2  represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, --COR 3 , --COOR 3  or --SO 2  R 3  ; and R 3  represents a hydrogen atom, an aliphatic group or an aromatic group.