On the production of X-rays in thin metal foils

Abstract
An effect is discussed whereby the production efficiency of x-rays in a thin metal foil bombarded by a beam of electrons is a function of the direction of the incident beam. The effect has an explanation similar to that of the ‘anomalous absorption’ effect observed on transmission electron micrographs of metal foils. The dark ‘absorption’ bands observed at low-order bend extinction contours in the transmission electron microscope image should be associated with regions of enhanced x-ray emission. The effect is important in the interpretation of scanning x-ray micrographs of metal foils, and may even be important for bulk specimens.

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