Abstract
Summary
1. Gamma radiation from cobalt-60 proves to be an effective method for inactivation of Lansing poliomyelitis, St. Louis encephalitis. Western equine encephalomyelitis and vaccinia viruses. 2. Partially purified suspensions of viruses tested were more vulnerable to lethal effects of gamma radiation than were crude suspensions. 3. In crude and partially purified suspensions the smaller viruses required larger doses of gamma radiation for inactivation than did the larger viruses. 4. The rate of inactivation for viruses tested, within error of experiment, is an exponential function of the dosage of gamma radiation.
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