Applying radio‐isotope 32P, the distribution of bacterial cells retained within glass‐fibre air sterilization filters was measured. In particular, the time‐dependence of the radial as well as the longitudinal distribution was studied. The collection efficiency of glass‐fibre was obtained and the experimental result was compared with a theoretical value based upon the sum of interception, inertia and diffusion. Discrepancies could not be accounted for and are similar to those in the literature. An equation was proposed for the estimation of air filter life. This was not completely verified but leads to some suggestive results.
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Aiba et al. (1959) studied this question.
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