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A radioactive source that is not under regulatory control, either because it has never been under regulatory control, or because it has been abandoned, lost, misplaced, stolen, or transferred without proper authorisation. ([https://www.iaea.org/resources/safety-standards/safety-glossary IAEA Glossary], 2016)
''ICRP Glossary entry - May 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''