A Comparison of the Effects of Acute and Protracted Gamma-radiation on the Growth of Seedlings ofVicia Faba

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Abstract
Observations with Vicia faba on the reduction of root ‘growth in ten days’ with increase of time-interval between two exposures, are analysed and indicate an approximately exponential recovery in the dose equivalent of sub-lethal damage with time after the first exposure, half-times of about 0·7 and two hours applying at 19° and 3·5°c respectively. Calculations are made of the theoretical dose response curves which are derived for exposure at 8·4, 1·52 and 0·89 rads/hour based on a survival curve for acute exposure of the form consistent with those results of previous experiments. Theoretical values of acute exposures equivalent to various protracted exposures agree well with the experimental results for 3·5°c where there is no significant cell-division during the exposure.