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The Spectracon

  • J. D. McGee
Part of the Optical Physics and Engineering book series (OPEG)

Abstract

The term “electronography” is now accepted for the technique of recording an image of photoelectrons by projecting them directly on to a suitable photographic emulsion. If each photoelectron can be made to excite a grain of silver halide so that it can be subsequently developed to be equal in size to a grain directly excited by image photons, then it follows that the image tube will record “faster” than direct photography by the ratio of the detective quantum efficiencies of the photocathode and the photographic emulsion. Recording “speed” is the reciprocal of the exposure required to reach a given photographic density. Not only will the electronographic recording be faster than the direct photography but, even more important, the amount of information recorded will be greater by the same factor, which has been shown in Chapter 6 of this volume to be about 100.

Keywords

Electron Physics Silver Halide Relative Exposure Detective Quantum Efficiency Image Tube 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • J. D. McGee
    • 1
  1. 1.Imperial College of Science and TechnologyLondonEngland

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