The after-survivals S of adult Drosophila melanogaster exposed to the same dose of 250 kV x-rays at various ages are constant fractions k of the remaining life expectancies E at those ages. The value of k is the same, also, if the life expectancy has been reduced by a prior dose or by such dose along with additional aging. The fraction k decreases as the dose R increases, and the present data are compatible with such general relations as <tex-math>${\rm log}\ k={\rm log}\frac{S}{E}=-0.0036(R+0.025R^{2})$</tex-math> or <tex-math>$\downarrow \frac{1}{k}=\frac{E}{S}=1+0.0043(R+0.025R^{2})$</tex-math>. The values of the constants are probably dependent on the quality of the radiation
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Copyright 1970 Academic Press, Inc.
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