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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
Fifty percent of the mass of material in the aerosol is associated with particles of diameter greater than the MMD. For a log-normal distribution with geo- metric geometric standard deviation sg <math>\sigma_g</math> the MMD can be calculated from the [[count median diameter]] (CMD):
<math>