Silver halide photographic emulsion

Abstract

Disclosed is a silver halide photographic light-sensitive emulsion comprising silver halide grains, wherein the silver halide constituent of said silver halide grains is substantially composed of at least one constituent selected from silver bromide or silver iodobromide, and said emulsion contains at least one kind of indium compound.

What is claimed is: 
     
       1. A silver halide photographic light-sensitive emulsion comprising core/shell type silver iodobromide grains, said silver iodobromide grains having inside a high silver iodide containing phase having a silver iodide content of not less than 8 mol %, said silver iodobromide grains further containing at least one kind of indium compound, wherein the silver iodobromide grains are chemically sensitized, and said indium compound is introduced within a period from starting formation of said silver iodobromide grains to starting the chemical sensitization. 
     
     
       2. The silver halide photographic light-sensitive emulsion of claim 1, wherein said indium compound is a trivalent compound. 
     
     
       3. The silver halide photographic light-sensitive emulsion of claim 1, wherein said silver iodobromide grains are twinned crystal silver iodobromide grains having two {111} planes parallel to each other. 
     
     
       4. The silver halide photographic light-sensitive emulsion of claim 1, wherein said silver iodobromide grains are tabular shaped silver iodobromide grains, and an average aspect ratio of said tabular shaped silver iodobromide grains is less than 5. 
     
     
       5. The silver halide photographic light-sensitive emulsion of claim 4, wherein said aspect ratio is not less than 1.1 and less than 4.5. 
     
     
       6. The silver halide photographic light-sensitive emulsion of claim 5, wherein said aspect ratio is not less than 1.2 and less than 4. 
     
     
       7. The silver halide photographic light-sensitive emulsion of claim 1, wherein each grain size of said silver iodobromide grains is within the range of 0.1 μm to 5.0 μm. 
     
     
       8. The silver halide photographic light-sensitive emulsion of claim 7, wherein said each grain size is within the range of 0.2 μm to 4.0 μm. 
     
     
       9. The silver halide photographic light-sensitive emulsion of claim 8, wherein said each grain size is within the range of 0.3 μm to 3.0 μm. 
     
     
       10. The silver halide photographic light-sensitive emulsion of claim 1, wherein said silver iodobromide grains are monodispersed, and an amount by weight of silver iodobromide grains having grain sizes within the range of ±20% of an average grain size is not less than 60%. 
     
     
       11. The silver halide photographic light-sensitive emulsion of claim 10, wherein said amount is 70%. 
     
     
       12. The silver halide photographic light-sensitive emulsion of claim 1, wherein said silver iodobromide grains are monodispersed and have a grain size distribution of not more than 20%, said grain size distribution being defined by the following Formula A: Grain size distribution (%)=(Standard deviation/Average grain size)×100.   
     
     
       13. The silver halide photographic light-sensitive emulsion of claim 1, wherein the silver iodide content of the silver iodobromide grains is within the range of 0.1 to 15 mol %, in terms of an average silver iodide content. 
     
     
       14. The silver halide photographic light-sensitive emulsion of claim 13, wherein the silver iodide content of the silver iodobromide grains is within the range of 5 mol % to 12 mol %, in terms of an average silver iodide content. 
     
     
       15. The silver halide photographic light-sensitive emulsion of claim 14, wherein said silver iodide content of the silver iodobromide grains is within the range of 6 mol % to 10 mol % in terms of an average silver iodide content. 
     
     
       16. The silver halide photographic light-sensitive emulsion of claim 1, said silver iodobromide grains each having an outermost layer with a silver iodide content of not more than 10 mol %. 
     
     
       17. The silver halide photographic light-sensitive emulsion of claim 16, said silver iodobromide grains further having an interlayer set between said outermost layer and said high silver iodide containing phase, wherein the silver iodide content of said interlayer is within the range of 10 to 22 mol %.