Abstract
This paper discusses in detail the direct viewing of x‐ray topographs via a secondary electron conduction (SEC) vidicon system. The various geometries used to record large area topographs, the theoretical and experimentally obtainable resolutions, and the applications of the different geometries for obtaining information about the defects within crystals are illustrated. Finally, some qualitative comparisons of a practical nature are made with other video systems used for recording x‐ray topographs.
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