Space charge

Last revised by Andrew Murphy on 29 Mar 2020

Space charge refers to the collection of electrons which are emitted from the metal surface, after the application of tube current, at a short distance away from the metal surface.

These electrons collect and form a cloud of negative charge around the metal surface. This space charge repels and limits the further emission of electrons from the surface and is referred to as the space charge effect. The effect is most noticeable at lower kVp.

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