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A study of the deposition and clearance of inhaled particles in the human nasal passage has identified and quantified the major routes of particle transport clearance from the nose. The results of the study have been used to construct a compartment model describing extrathoracic clearance. Experimental evidence for each of the model's clearance routes is discussed. [ABSTRACT FROM AUTHOR]

The article presents a study that investigates the volunteer study of the National Radiological Protection Board (NRPB) to determine the health implications of inhaled particles on the nasal passage of human beings in Great Britain. It states the new model on respiratory tract imposed by the International Commission on Radiological Protection (ICRP). Moreover, the effects of aerosol on the respiratory tract of humans are also mentioned.

An experimental study of the absorption into blood of inhaled plutonium nitrate from the human respiratory tract was conducted. Human respiratory tract model (HRTM) parameters describing the time dependence of absorption were evaluated and compared with similar parameters determined for rats. [ABSTRACT FROM AUTHOR]

An experimental study of the absorption of inhaled gadolinium oxide from the human respiratory tract was conducted. Preliminary estimates of human respiratory tract model (HRTM) parameters describing the time dependence of absorption were derived and are compared with similar parameters determined from the results of experiments with laboratory animals. [ABSTRACT FROM AUTHOR]