Abstract
Seedlings of Vicia faba have been used to measure the oxygen enhancement ratio (O.E.R.) for acute X-ray and protracted γ-ray exposures at 3°C and 19°C. At 3°C there was no significant difference between the O.E.R. for acute or protracted exposures (2·67 and 2·70 respectively). At 19°C the O.E.R. was significantly lower for protracted than for acute exposures (2·06 compared with 2·58). There was found to be no recovery between splitdoses delivered under hypoxic conditions in contrast to the marked recovery which takes place when the irradiation is carried out under conditions of normal aeration.
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