Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Patent
1997-08-14
1998-10-20
Huff, Mark F.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
430508, 430509, 430966, 430438, 430604, 430567, G03C 146, G03C 516, G03C 1035
Patent
active
058244603
ABSTRACT:
A dual-coated radiographic element is disclosed that is capable of providing improved gastrointestinal tract images. Specifically, the radiographic elements are capable of simultaneously providing a maximum density of less than 3.0, a contrast in the range of from 1.0 to 2.0 over a lower exposure region (typically achieved by adding barium to the gastrointestinal tract) extending over an exposure range of 0.3 log E, a contrast of in the range of from 1.0 to 2.0 over a higher exposure region (typically achieved by adding an effervescent substance to the gastrointestinal tract) extending over an exposure range of 0.6 log E, and a contrast greater than 3.5 over an intermediate exposure region extending over an exposure range of 0.6 log E. To accomplish this, underlying and overlying spectrally sensitized tabular grain emulsion layers are coated on each major surface of a support. The underlying emulsion layers contain a processing solution decolorizable dye to reduce crossover to less than 15 percent and a lower speed polydisperse tabular grain emulsion containing rhodium as a dopant. The overlying emulsion layers contain a blend of higher speed polydisperse and intermediate speed monodisperse tabular grain emulsions. The radiographic elements are fully forehardened with total hydrophilic colloid coverages per side limited to less than 35 mg/dm.sup.2 to allow processing in less than 45 seconds.
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Eastman Kodak Company
Huff Mark F.
Thomas Carl O.
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