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8.6 x 1005

a Reproduced from T. F. Hatch and P. Gross, Pulmonary Deposition

and Retention of Inhaled Aerosols, Academic Press, New York, 1964.

where t is the time of travel. If the tube (or part of the bronchial tree) in which they move is of radius R and is inclined at an angle y to the horizontal, the maximum distance of fall will no longer be 2R but 2R/cos y. The ratio, r, of the distance of fall to the maximum distance for deposition to be achieved is thus

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