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Diameter of a unit density (1 g cm<sup>-3</sup>) sphere that has same terminal settling velocity in air as the particle of interest. (Adapted from [[ICRP Publication 130]], 2015)
''ICRP Glossary entry - May 2019''
===Previous Description===Diameter (µm) of unit density sphere that has same terminal settling velocity in air as the particle of interest. (From [[ICRP Publication 119]], 2012) '''Return to [[ICRP Glossary|Glossary]] entry - May 2019'''