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Activity median aerodynamic diameter

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A value of aerodynamic diameter (dae) such that 50% of the activity in the aerosol is associated with particles of aerodynamic diameter greater than the AMAD. The AMAD is used when deposition depends principally on inertial impaction and sedimentation, typically when dae is more than about 0.3 μm.

(adapted from ICRP Publication 130, 2015)

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