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Receiver exposure: Defined as radioactivity inhaled by receiver manikin (as percent activity exhaled ± CI) when mask was placed on the source, masks tested are sealed and unsealed. N95 (3M respirator), SMnat (surgical mask looped naturally around the ears), SF (SecureFit™ Ultra Fitted surgical mask), and PT (SecureFit™ Ultra Fitted surgical mask with nanofiber filter media). Receiver exposure factor is defined as ratio of MaxEx to actual exposure, calculated for each mask type.
