Apparatus was designed and constructed in which a bacterial aerosol of known age, particle size, and relative humidity (RH) could be exposed to ultraviolet (UV) radiation of measured intensity for a given period of time and then be sampled quantitatively. Aerosols of Serratia marcescens were exposed to UV dosages between 96.0 and 0.75 (Aw-sec)/cm2 at humidities ranging from 25 to
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