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Description
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Cold cathodes sometimes have rare earth coating on them for enhancing electron emission. Some types contain a source of beta radiation to start ionization of the gas that fills the tube. In such a tube, glow discharge around the cathode is usually minimized, in favor of a so called positive column, filling the tube. The best example is the humble neon lamp. Another good example is Nixie tubes. Nixie tubes too are cold cathode neon displays that also happen to be in-line, but not in-plane display devices.
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