Abstract
Abstract For a comprehensive description of the fraction, SF , of species surviving irradiation dose, D , we use the generalized exponential SF =exp[−( D / D 0 ) α ], where D 0 denotes the effective dose, and α >0 is the dispersion parameter. The generalized exponential reduces to an exponential survival curve for α =1, reproduces the concave or tailed survival curves for 0 α α >1. The differences among these common types of survival curves are phenomenologically interpreted solely in terms of the distributions of radiation sensitivity of species under the given experimental conditions. As an example the survival statistics for five strains of yeast Saccharomyces cerevisine are shown.
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