Abstract: A silver halide photographic emulsion is disclosed, comprising silver halide grains wherein at least 80% of a total grain projected area is accounted for by tabular grains, the tabular grains having an average aspect ratio of at least 12, a variation coefficient of grain diameter of less than 30%, an average overall surface iodide content of 5 to 15 mol % and an average surface iodide content in the vicinity of corners of the grains of less than 3 mol %; and the tabular grains further having a shallow electron trap center in the peripheral region of the grain.

Abstract: A silver halide photographic emulsion is disclosed, comprising silver halide grains wherein at least 80% of a total grain projected area is accounted for by tabular grains, the tabular grains having an average aspect ratio of at least 12, a variation coefficient of grain diameter of less than 30%, an average overall surface iodide content of 5 to 15 mol % and an average surface iodide content in the vicinity of corners of the grains of less than 3 mol %; and the tabular grains further having a shallow electron trap center in the peripheral region of the grain.

Abstract: A silver halide emulsion is disclosed, comprising silver halide grains, wherein a variation coefficient of grain diameter of the whole silver halide grains is not more than 25%, wherein at least 50% of the total grain projected area is accounted for by tabular grains having two twin planes and an aspect ratio of not less than 6 and meeting the following requirement, 1.0≦b/a≦1.3. Photographic materials containing the silver halide emulsion is also disclosed.

Abstract: A silver halide emulsion is disclosed, comprising tabular grains having an aspect ratio of 5 or more, the tabular grains further having dislocation lines of 30 or more per a grain, in a fringe portion of the grain and the tabular grains each containing silver iodide, the content of which gradually and continuously varies in the direction of from the grain center to the edge.

Abstract: A silver halide emulsion is disclosed, comprising tabular grains having an aspect ratio of 5 or more, the tabular grains further having dislocation lines of 30 or more per a grain, in a fringe portion of the grain and the tabular grains each containing silver iodide, the content of which gradually and continuously varies in the direction of from the grain center to the edge.

Abstract: A method for preparing a silver halide emulsion is disclosed, wherein the method controls a mean intergrain distance in the process of growing silver halide grains contained in a silver halide emulsion, as defined below, over a period of from the start of growing silver halide grains to completion thereof: Mean intergrain distance=(Volume of the reaction mixture solution/number of grains in the reaction mixture solution)⅓.

Abstract: A silver halide emulsion is disclosed, comprising silver halide grains having a variation coefficient of a grain diameter of 20% or less, at least 50% of total grain projected area being accounted for by tabular silver halide grains having an aspect ratio of 2 or more, said tabular grains each having 10 or more dislocation lines per grain in the peripheral region of the grain and having a variation coefficient of dislocation line length of 20% or less. A color photographic material by use of the emulsion is also disclosed.

Abstract: A silver halide emulsion is disclosed, comprising a dispersing medium and silver halide grains having a variation coefficient of grain size distribution of not more than 20%, at least 50% of total grain projected area of the emulsion being accounted for by tabular grains an aspect ratio of at least 5, the tabular grains each having a surface region having an iodide content more than an average iodide content of the grains, the tabular grains having dislocation lines in a central region and a peripheral region of the major faces, the peripheral region having a silver chalcogenide nucleus-containing phase, the central region having silver nucleus-containing phase, and the peripheral region having at least 10 dislocation lines per grain.

Abstract: A silver halide light sensitive photographic material is disclosed, comprising a support having thereon a silver halide emulsion layer containing tabular grains having an aspect ratio of not less than 5 and an even number of parallel twin planes, the tabular grains further satisfying the following requirements:(A) a coefficient of variation of grain size being 20% or less,(B) 0.7.ltoreq.y/x.ltoreq.2.0, where x represent a coefficient of variation of twin plane spacing and y represents a coefficient of variation of grain thickness, and (C) the grains having, in the interior of the grain, an internal layer having an iodide content higher than that of the grain surface, and the iodide content of the grain surface being higher than an average overall iodide content of the grains.

Abstract: A silver halide color photographic material is disclosed, comprising a support having thereon a silver halide emulsion layer containing silver halide grains having a variation coefficient of grain size of 20% or less and at least 50% of the total grain projected area is accounted for by tabular grains having an aspect ratio of 5 or more; and the silver halide grains having an average silver iodide content of 4 mol % or more and a distinct core/shell structure comprising a core portion having a silver iodide content of 15 mol % or less, a shell portion having a silver iodide content of 8 mol % or more, and a surface phase having a silver iodide content higher than the average silver iodide content.

Abstract: A silver halide photographic emulsion comprising silver halide grains which are prepared by a process comprising forming the silver halide grains in the presence of a dispersing medium and chemically sensitizing the silver halide grains formed, wherein, in the step of forming the silver halide grains, at least a part of the dispersing medium is a gelatin having an adenine content of 0.2 .mu.g or less per g of gelatin and the silver halide grains are chemically sensitized in the presence of a compound represented by the following formula.

Abstract: A silver halide photographic emulsion is disclosed, wherein the silver halide emulsion contains silver halide grains having an average iodide content of not less than 4 mol %, the grains comprising an internal silver halide phase having an average iodide content of 10 mol % to a solid solution limit and a surface silver halide phase having an average iodide content of not more than 4.5 mol %.

Abstract: A silver halide photographic light-sensitive emulsion is disclosed. The emulsion comprises silver halide grains formed under a condition in which fine grains of silver halide are supplied into the protective colloid solution, in which the silver halide grains are formed, in a period in the course of formation of the grains, andthe sum of projection area of tabular grains each having a aspect ratio larger than 1.2 accounts for lower than 50% of the total projection area of the whole silver halide grains of the emulsion, and the tabular grains have an average aspect ratio is more than 1.2 and less than 5.0 and an average grain size of not larger than 0.6 .mu.m.

Abstract: Disclosed is a silver halide photographic emulsion which comprises a dispersion medium and silver halide grains, wherein said silver halide grains are prepared by a process comprising the steps of:(a) preparing a dispersion medium, wherein said dispersion medium comprises a gelatin solution,(b) introducing an oxidizer into said dispersion medium; and(c) introducing silver halide seed grains.The silver halide emulsion provides a sliver halide photographic light-sensitive material high in sensitivity and excellent in pressure resistance.

Abstract: A silver halide photographic light-sensitive material is provided, comprising silver halide-grains which meet the following requirements:(1) the silver halide grains are formed from seed crystals through the growth of the crystals, wherein a silver halide phase formed in each grain, before 30% of the addition amount of silver is supplied, is formed while the intergrain distance of individual silver halide grains contained in the reaction liquor being kept within a range of 0.1 to 2.0 .mu.m;(2) the silver halide grains each have, in respect of distance L from the grain center to the grain surface, a point at which the content of silver iodide becomes maximum within distance L.sub.1 from the grain center to 0.67 L, and a point at which the content of silver iodide becomes minimum within distance L.sub.2 from 0.58 L to the grain surface and, in each grain, the silver iodide content shows a substantially monotonous decrease in the range from L.sub.1 to L.sub.2, and (L.sub.2 -L.sub.1)/L>0.20 is satisfied.

Abstract: A silver halide photographic light-sensitive material comprising a support having thereon a silver halide emulsion layer containing silver halide grains which meet the following requirements (1) and (2):(1) the silver halide grains are formed in the presence of an oxidizing agent, and(2) the silver halide grains each have, in respect of distance L from the grain center to the grain surface, a point at which the content of silver iodide becomes maximum within distance L.sub.1 from the grain center to 0.67 L, and a point at which the content of silver iodide becomes minimum within distance L.sub.2 from 0.58 L to the grain surface and, in each grain, the silver iodide content shows a substantially monotonous decease in the range from L.sub.1 to L.sub.2, and(L.sub.2 -L.sub.1)/L>0.20is satisfied.

Abstract: A silver halide emulsion comprising a dispersing medium and light-sensitive silver halide grains wherein said silver halide grains each comprise:(a) a high silver iodide-containing phase having a silver iodide content of not less than 15 mol % in the internal portion,(b) a low silver iodide-containing phase locating outside the phase (a) and having a silver iodide content lower than that of the phase (a), and(c) a surface phase having a silver iodide content higher than that of an inner phase adjacent thereto,and wherein a part or all of the phase (c) and a part or all of the phase (a) or the phase (b) are formed by supplying a fine silver halide grain emulsion prepared in the presence of protective colloid.

Abstract: A silver halide photographic emulsion is disclosed. The emulsion contains core/shell type silver halide grain comprising a core essentially consisting of silver iodobromide and at least one shell essentially consisting of silver iodobromide or silver bromide, in which said silver halide emulsion have an average silver iodide content of less than 7 mol %, and said core has a silver iodide content of not less than 10 mol % a shell arranged at the outermost portion of said shell has a silver iodide content of not more than 5 mol %, and said core and shell have a distinct core/shell structure. The emulsion is excellent in developing activity, ready in contrast control and excellent in processing stability, with out deteriorating both sensitivity and pressure resistance property.

Abstract: A silver halide color photographic light-sensitive material is provided, wherein at least one spectral-sensitive layer comprises two or more silver Halide emulsion layers each containing monodispersed silver halide grains having two parallel twin planes and an aspect ratio of 3 or less, having development starting points localized at specific sites on the grain surface or in the vicinity thereof.