Radiographic elements with selected contrast relationships

  • US 4,994,355 A
  • Filed: 03/29/1990
  • Issued: 02/19/1991
  • Est. Priority Date: 07/26/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. A radiographic element comprised ofa transparent film support,first and second silver halide emulsion layer units coated on opposite sides of the film support, andmeans for reducing to less than 10 percent crossover of electromagnetic radiation of wavelengths longer than 300 nm capable of forming a latent image in the silver halide emulsion layer units, said crossover reducing means being decolorized in less than 90 seconds during processing of said emulsion layer units,characterized in thatthe first silver halide emulsion layer unit exhibits an average contrast of less than 2.0, based on density measurements at 0.25 and 2.0 above minimum density andthe second silver halide emulsion layer unit exhibits an average contrast of at least 2.5, based on density measurements at 0.25 and 2.0 above minimum density,the contrast of the first silver halide emulsion layer unit being determined with the first silver halide emulsion unit replacing the second silver halide emulsion unit to provide an arrangement with the first silver halide emulsion unit present on both sides of the transparent support andthe contrast of the second silver halide emulsion layer unit being determined with the second silver halide emulsion unit replacing the first silver halide emulsion unit to provide an arrangement with the second silver halide emulsion layer unit present on both sides of the transparent support.

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