Radiation Intensity and the Induction of Mutation in Drosophila

Abstract
A study was made of the effect of intensity of irradiation on the production of IInd chromosome lethal mutations in spermatozoa and spermatogonia of Drosophila. No intensity effect was detected between x-ray doses of 3000 r given at 600 r/min and 2·0 r/min respectively, or 60Co γ-ray doses of 3000 r given at 2000 r/min and 2·0 r/min respectively. A comparison between the effect of 60Co γ-rays given at 2·0 r/min and 0·01 r/min at a total dose of 200 r showed that a slight intensity effect might be operative in spermatogonia but that this was very much less than that observed by Russell in the mouse over a comparable dose-rate range.

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