A QUANTITATIVE METHOD OF DETERMINING THE LETHAL EFFECT OF ULTRAVIOLET LIGHT ON BACTERIA SUSPENDED IN AIR

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Abstract
A long tubular lamp of standard make giving 88% of its output at 2537 A with complete cutoff at 2300 A is used. Air carrying the bacteria is passed in a steady stream between this lamp and a concentric cylinder slightly larger in diam. Means have been devised for detecting the presence of viable bacteria in the air stream after exposure. Preliminary results with Staphylococcus albus show that 26,200 ergs per sq. cm. are sufficient to kill all the suspended bacteria present with an exposure of 1.06 sec. This amount is of the same order of magnitude as that obtained by other observers using the plate method of exposure to rays of the same X.

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