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Promethium is a rare-earth metal that emits beta radius. It is very radioactive and rare, so it is little studied: its chemical and physical properties are not well defined. Promethium salts have a pink or red colour that colours the surroundings air with a pale blue-green light.
Most promethium is used for research purpose. It can be used as beta radiation source in luminous paint, in nuclear batteries for guided missiles, watches, pacemakers and radios, and as a light source for signals. It is possible that in future it will be used as portable X-ray source.