Radiographic film material exhibiting increased covering power and “colder” blue-black image tone

US6346360B1 · kind B1 · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Ann Verbeeck · Begijnendijk, BE
• Freddy Henderickx · Olen, BE

Key dates

• Filing date: Nov 7, 2000
• Grant date: Feb 12, 2002
• Expiry date: Nov 7, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/167
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A radiographic film material has been provided, comprising a transparent film support having first and second major surfaces coated, apart from a subbing layer and, optionally, a non-light-sensitive hydrophilic layer thereupon, with at least one light-sensitive silver halide emulsion layer overcoated with a protective antistress layer, said emulsion layer(s) having chemically and spectrally sensitized {111} tabular hexagonal core-shell emulsion grains or crystals in an amount of at least 50% of the total projective grain surface of all grains, said grains being composed of a silver bromide core and a silver bromoiodide shell having an average amount over the whole crystal volume of more than 90 mole % of silver bromide, said grains further having a mean equivalent volume diameter of from 0.3 &mgr;m up to 1.0 &mgr;m and an average grain thickness of less than 0.30 &mgr;m, wherein said film material is coated with a total amount of silver, expressed as an equivalent amount of silver nitrate of less than 7 g/m2, characterized in that all silver iodide is present in an outermost shell corresponding with at most 20% of all silver halide precipitated in order to provide silver iodide to …