View source for Activity median thermodynamic diameter

A value of aerodynamic diameter such that 50% of the activity in the aerosol is associated with particles of [[thermodynamic diameter]] (d<sub>th</sub>) greater than the AMTD. The AMTD is used when deposition depends principally on diffusion, typically when the AMAD is less than about 0.3 μm. (Adapted from [[ICRP Publication 130]], 2015)

''ICRP Glossary entry -  May 2019''


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