Silver halide photographic emulsion for medicine, preparing method thereof, and infrared film comprising the same

摘要

PURPOSE: A medical silver halogen photographic emulsion and an infrared film containing the emulsion for the MRI diagnosis are provided, wherein the emulsion is applied to the film the MRI diagnosis having high contrast, high resolution and sensitivity in an infrared range of 680-810 nm. CONSTITUTION: The silver halogen photographic emulsion is prepared by dispersing micro crystal particle of silver halogen to gelatin, wherein the emulsion is prepared by adding ammonia silver nitrated solution by a back mixing method, washing it to obtain 2-3 mol% of silver iodide, to obtain regular square-shaped silver halogen with an average size of 0.45-0.55 micrometers, and adding potassium iodine as a fog generation preventer and an intensifier dye absorbing the light of a wavelength of 680-810 nm. Preferably the washing is carried out by precipitation method in the case of polycarbamyl gelatin, and by noodle method or sulfate coagulation method in the case of bone gelatin.