| 摘要 |
MEANS FOR ASSURING PROPER ORIENTATION OF THE FILM IN AN ASYMMETRICAL RADIOGRAPHIC ASSEMBLY An asymmetrical radiographic element is disclosed comprised of a transparent film support, green sensitized silver halide emulsion layer units of differing sensitometric characteristics coated on opposite sides of the film support, and a processing solution decolorizable means for reducing crossover to less than 10 percent. The element is positioned between intensifying screens and mounted in a cassette for exposure to X-radiation. A processing solution decolorizable pentamethineoxonol dye with insignificant absorption at 550nm is incorporated into an overcoat layer to distinguish which of the emulsion layer units is positioned nearest a source of X-radiation during exposure.
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