| 摘要 |
A light-sensitive silver halide photographic film material has been provided, said film material comprising a transparent support and on both sides thereof at least one light-sensitive emulsion layer having spectrally and chemically sensitized tabular silver halide grains rich in silver bromide, further having silver iodide in an amount of less than 3 mole % based on silver, with two flat parallel ä111ü crystal faces, said grains accounting for a total projective surface of said parallel crystal faces in said emulsion of at least 50 %, further having an average aspect ratio of at least 2:1, a grain thickness of from 0.05 up to 0.15 mu m, a site-directing azacyanine compound satisfying the general formulae disclosed herein in an amount of not less than 1 x 10<-4> mole per mole of silver halide coated and one or more J-aggregating spectrally sensitizing dye(s), wherein a molar ratio amount between said site directing compound and said J-aggregating spectrally sensitizing dye(s) is at least 1:6 for a grain coverage of said ä111ü tabular grains exceeding 50 %. A radiographic screen/film combination has also been described comprising said light-sensitive silver halide photographic film material and two supporting or self-supporting X-ray intensifying screens)comprising luminescent phosphors, wherein by contacting the film material with a sandwich of a pair of said intensifying screens and exposing said combination to X-rays, emission of radiation by said luminescent phosphors in the wavelength range for which said material has been made spectrally sensitive provides a black-and-white diagnostic image after processing of said exposed radiographic film material.
|
