Radiographic elements suitable for medical diagnostic imaging employing a symmetrically coated emulsion combination

摘要

Radiographic elements for medical diagnostic imaging are disclosed in which silver halide emulsion layer units coated on opposite sides of a transparent support together provide a point gamma of at least 1.0 at an image density of 1 and a point gamma of at least 2.0 at an image density of 2.5. The emulsion layer units both contain a combination of tabular grain emulsions including, a polydisperse tabular grain silver halide emulsion portion exhibiting a coefficient of variation of grain diameter of greater than 30 percent and a monodisperse tabular grain silver halide emulsion (a) accounting for from 20 to 50 percent of the combination of tabular grain emulsions, based on total silver, (b) having a mean grain diameter of less than the mean grain diameter of the combination of tabular grain emulsions, and (c) exhibiting a coefficient of variation of grain diameter of less than 10 percent. <IMAGE>