Extrathoracic deposition was studied using an idealized average human mouth and throat
replica. Effects of particle size, flow rate and flow Reynolds number were examined using
gamma scintigraphy and gravimetry. Radiolabeled monodisperse sebacate (DEHS) oil
particles of mass median diameter dp= 3, 5 and 6.5 μm and two constant flow rates Q= 30
and 90 l/min were used. Total and regional depositions were measured using costumized
image analysis software that allowed extraction of position and intensity of radioactive sites …