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Amplification and entailed resolution degradation in high‐pressure gas ionography
Author(s) -
Peschmann K. R.,
Grosche G.
Publication year - 1977
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594387
Subject(s) - xenon , krypton , detective quantum efficiency , resolution (logic) , electron , image resolution , noise (video) , atomic physics , materials science , physics , optics , nuclear physics , computer science , image quality , artificial intelligence , image (mathematics)
This work deals with the introduction of a gas electronic gain factor in high‐pressure ionography (or “electron radiography”). The purpose is to check the possibility of a further reduction of radiation dose per radiograph. It is shown that xenon or krypton can be mixed with special molecular gases in order to achieve charge‐carrier multiplication at comparatively weak electrostatic fields and in an easily controllable manner. Some radiographs are reproduced which have been obtained in the amplifying working modes of the system. Relevant image characteristics and their limits are discussed. The obtainable resolution is limited by electron diffusion and by quantum noise (lowering of the effective quantum‐detection efficiency).