Asymmetric speed portal imaging assembly and method of use

A radiographic imaging assembly comprising a first radiographic silver halide film arranged in association with a second radiographic silver halide film,

• (a) said first radiographic silver halide film comprising a support having first and second major surfaces and is capable of transmitting X-radiation,
• said first radiographic silver halide film having disposed on said first major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer, and on said second major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer,
• each of said silver halide emulsion layers comprising silver halide cubic grains that (a) have the same or different composition in each silver halide emulsion layer, (b) have an average grain size of from about 0.1 to about 0.3 μm, and (c) are composed of at least 80 mol % chloride, up to 20 mol % bromide, and up to 2 mol % iodide, based on total silver, and
• all hydrophilic layers of said first radiographic silver halide film being fully forehardened and wet processing solution permeable for image formation within 45 seconds,
• (b) said second radiographic silver halide film comprising a support having first and second major surfaces and is capable of transmitting X-radiation,
• said second radiographic silver halide film having disposed on said first major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer, and on said second major support surface, one or more hydrophilic colloid layers including at least one silver halide emulsion layer,
• each of said silver halide emulsion layers comprising silver halide cubic grains that (a) have the same or different composition in each silver halide emulsion layer, (b) have an average grain size of from about 0.1 to about 0.3 μm, and (c) are composed of at least 80 mol % chloride, up to 20 mol % bromide and up to 2 mol % iodide, based on total silver, and
• all hydrophilic layers of said second radiographic silver halide film being fully forehardened and wet processing solution permeable for image formation within 45 seconds,
• wherein the ratio of the photographic speed of said first radiographic silver halide film to the photographic speed of said second radiographic silver halide film is at least 0.3 logE, and
• said imaging assembly further comprising a fluorescent intensifying screen on both the front and back of the combination of said first and second radiographic silver halide films, and a metal intensifying screen on the front of said front fluorescent intensifying screen.