Fibrous Filters as Particle-Size Analyzers

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Science  07 Feb 1964:
Vol. 143, Issue 3606, pp. 572-573
DOI: 10.1126/science.143.3606.572


A method was developed for characterizing radioactive aerosols by determining their distribution as a function of depth in fibrous filters under carefully controlled conditions. The method distinguishes the contributions of three major processes of filtration: diffusion, interception, and inertial impaction. For those experiments where diffusion is the controlling mechanism, particle sizes in the range of 50 to 500 Å thus determined compare favorably with those obtained from concentration and flow data and electron photomicrographs.