Abstract: A silver halide emulsion having a silver chloride content of 90 mol % or more which has been chemically sensitized with a compound capable of releasing an AuICh− ion is described, wherein grains of the silver halide contain in the shell portion thereof 0.01 to 0.50 mol % of silver iodide per mol of the total silver, with Ch representing S, Se or Te.

Abstract: The present invention provides a photosensitive silver halide photographic emulsion comprising a silver iodide content of 41 mol % or more and 100 mol % or less and including a silver halide to which reduction sensitization is applied in the course of particle formation, and silver halide photographic emulsion comprising 41 mol % to 100 mol % of silver iodide and subjected to at least one of chalcogen sensitization and gold sensitization to the insides of particles.

Abstract: The present invention provides a photothermographic material including a support having disposed thereon an image-forming layer that contains at least a non-photosensitive organic silver salt, a photosensitive silver halide, a reducing agent and a binder, and further including a compound represented by the following formula (I):

Abstract: The present invention provides a photothermographic material, comprising a photosensitive silver halide, a non-photosensitive organic solvent salt, a reducing agent for a silver ion, and a binder on one face of a support, for being applied by using an organic solvent, the photothermographic material further comprising at least one compound selected from the group of compounds consisting of: a compound represented by the following general formula (1), a compound having a &bgr;-lactam ring, a compound having a group that is adsorptive to a silver halide and a group that reduces a silver halide and a precursor thereof: 1

Abstract: This invention relates to a silver halide photographic emulsion in which a silver emulsion high in silver iodide content of 80% by mol to 100% by mol based on the silver iodide content is chemically sensitized by at least one of methods of chalcogen sensitization and gold sensitization under the conditions that pAg is from 1.5 to 7.0, as well as a thermally developable photosensitive material having at least one image forming layer containing at least a non-photosensitive organic silver salt, a photosensitive silver halide, a reducing agent and a binder on a support, and having at least one non-image recording protection layer to the image forming layer on the side remote from the support, and exposed by a laser beam in which the material contains the silver emulsion high in silver iodide content.

Abstract: A silver halide emulsion having a silver chloride content of 90 mol % or more which has been chemically sensitized with a compound capable of releasing an AuICh− ion is described, wherein grains of the silver halide contain in the shell portion thereof 0.01 to 0.50 mol % of silver iodide per mol of the total silver, with Ch representing S, Se or Te.

Abstract: Disclosed are photothermographic materials having, on a support, a layer that contains at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the mean silver iodide content of the photosensitive silver halide falls between 5 and 100 mol %, preferably between 40 and 100 mol %.

Abstract: There is disclosed a light-sensitive silver halide photographic emulsion, which comprises light-sensitive silver halide grains mainly composed of (100) planes and (111) planes, at least one compound that is adsorbed selectively on the (100) planes of the silver halide grains, and at least one spectrally sensitizing dye. There is also disclosed a light-sensitive material using the emulsion. The emulsion is high in sensitivity and excellent in graininess.

Abstract: A process for reduction-sensitizing a silver halide photographic emulsion is disclosed, comprising reduction-sensitizing a silver halide basis grain having a silver bromide content of 75 mol % or more and thereafter or at the same time, depositing silver halide having a silver chloride content of 50 mol % or more on the surface of said basis grain not to have a distinct epitaxial form. Further disclosed is a silver halide photographic light-sensitive material containing a silver halide emulsion prepared by the process.

Abstract: A silver halide photographic emulsion is disclosed, which is chemically sensitized with a compound having an adsorptive group onto silver halide and a labile sulfur moiety, and further a silver halide photographic material using the same emulsion is disclosed.

Abstract: A method of reduction sensitization to provide a low-fog and high-speed silver halide emulsion having satisfactory preservability and a silver halide photographic material containing a silver halide emulsion having been reduction sensitized by the method are disclosed, the reduction sensitization being carried out using a compound having a group which is capable of being adsorbed onto a silver halide and a reducing group or a precursor of that compound during silver halide grain formation or after completion of grain formation.

Abstract: A silver halide emulsion is disclosed, which is subjected to chemical ripening using a labile tellurium sensitizer and/or a labile selenium sensitizer in the presence of at least one compound represented by formula (I), (II), (III) or (IV) described in the specification.

Abstract: A method for producing a silver halide emulsion, said method comprising: adding silver nitrate to a halogen compound to form an emulsion grain; and doping a non-labile selenium compound in an amount, in terms of selenium added, of from 1.0.times.10.sup.-8 to 1.0.times.10.sup.-6 mol per a unit surface area of 1 m.sup.2 of said emulsion grain, at the time when from 10 to 49% of the total silver amount used for the formation of said emulsion grain is added.

Abstract: A silver halide photographic emulsion which comprises silver halide grains having a silver chloride content of at least 60 mol % and an octatetracontahedral crystal form of the kind which is constructed of 48 triangular faces, every one of which contacts convexly with each of its two adjoining faces to form a line and concavely with its one adjoining face to form a line, with the grains being formed in the presence of a synthetic polymer peptizer which contains, as repeating units, units derived from a thioether linkage-containing ethylenically unsaturated monomer, in a mole fraction of from about 20 to 100 mole %, thereby achieving low fog and high sensitivity.

Abstract: A silver halide photographic material having the improved storability and anti-stress property is disclosed, which comprises a support having provided thereon at least one light-sensitive silver halide emulsion layer containing a silver halide emulsion, wherein the silver halide emulsion is subjected to a chemical sensitization with a selenium compound, and the emulsion layer or another layer provided on the support contains at least one of the compounds represented by formulas (I), (II) and (III): ##STR1## wherein R.sub.11 to R.sub.16, R.sub.21 to R.sub.26, R.sub.1 and R.sub.2 are defined in the specification.

Abstract: A silver halide photographic material having the improved storability and anti-stress property is disclosed, which comprises a support having provided thereon at least one light-sensitive silver halide emulsion layer containing a silver halide emulsion, wherein the silver halide emulsion is subjected to a chemical sensitization with a selenium compound, and the emulsion layer or another layer provided on the support contains at least one of the compounds represented by formulas (I), (II) and (III): ##STR1##

Abstract: A silver halide photographic light-sensitive material having at least one silver halide emulsion layer formed on a support, said emulsion layer containing tabular grains having an aspect ratio of 3 or more, which occupy at least 50% of the total projected area of all silver halide grains contained in the emulsion layer. The silver halide grains have been subjected to tellurium sensitization using at least butyl-diisopropylphosphinetelluride as a sensitizer, and also to other chemical sensitization.

Abstract: A silver halide photographic material comprises a silver halide emulsion layer provided on a support. The silver halide emulsion layer contains a selenium or tellurium compound represented by the formula (I): ##STR1## in which Ch is Se or Te; R.sup.1 is hydrogen, an aliphatic group, an aromatic group, a heterocyclic group, --OR.sup.11 or --NR.sup.12 R.sup.13 ; each of R.sup.11, R.sup.12 and R.sup.13 is hydrogen, an aliphatic group, an aromatic group or a heterocyclic group; and R.sup.2 is an aliphatic group, an aromatic group or a heterocyclic group.

Abstract: A direct-positive silver halide photographic material is disclosed, which comprises a support having thereon at least one prefogged light-sensitive silver halide emulsion layer, wherein said silver halide emulsion is an emulsion which has been previously fogged with a gold compound and a tellurium compound.

Abstract: A silver halide photographic material comprises a silver halide emulsion layer provided on a support. The silver halide emulsion layer contains a selenium compound represented by the formula (I), (IIa) or (IIb): ##STR1## in which each of R.sup.11 and R.sup.12 is hydrogen, an aliphatic group, an aromatic group, a heterocyclic group, --OR.sup.13 or --NR.sup.14 R.sup.15 ; each of R.sup.21 and R.sup.31 is an aliphatic group, an aromatic group, a heterocyclic group, --OR.sup.23 or --NR.sup.24 R.sup.25 ; each of R.sup.22 and R.sup.32 is an aliphatic group, an aromatic group or a heterocyclic group; each of R.sup.13, R.sup.14, R.sup.15, R.sup.23, R.sup.24 and R.sup.25 is hydrogen, an aliphatic group, an aromatic group or a heterocyclic group; and Ch is S, Se or Te.