Process for preparing silver halide emulsion and silver halide x-ray photographic material containing said emulsion.

摘要

A process for treating a tabular silver halide emulsion is disclosed comprising the steps of subjecting the tabular silver halide emulsion to reduction sensitization and to sulfur sensitization or selenium sensitization and/or gold sensitization in the presence of a nitrogen-containing heterocyclic compound which forms a complex with silver during the manufacture of the tabular silver halide emulsion, said tabular emulsion having a grain size distribution such that grains having an average aspect ratio of not lower than 3.0 constitute at least 50% of the total projected area of all of the silver halide grains. There is also disclosed a silver halide X-ray photographic material comprising a support having thereon at least one silver halide emulsion layer containing a tabular silver halide emulsion prepared in accordance with the above process.