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The ratio of the activity per unit area (or per unit mass or volume) before a particular decontamination technique is applied to the activity per unit area (or per unit mass or volume) after the technique is applied. ([https://www.iaea.org/sites/default/files/17/11/iaea-safety-glossary-rev2016.pdf IAEA Glossary 2016])
''ICRP Glossary entry - May 2019''
'''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''