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Cyanobacteria; Gamma rays; Microbial viability counts


A method for quantitative recovery of the blue-green alga, Anacystis nidulans, after treatment with gamma rays is described, and data for the survival of the alga after exposure to a gamma source is presented. No conclusions could be drown by applying a "multi-target" model relating dosage to survival. Application of the data lo a revised target-theoretical expression which included the effects of a dose-dependent repair mechanism indicates that such a mechanism is present in A. nidulans. The validity of these dose-response models is discussed.

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