The Oxygen Effect for Acute and Protracted Radiation Exposures Measured with Seedlings ofVicia faba

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Abstract
Seedlings of Vicia faba were used to measure the O2 enhancement ratio (OER) for acute X-ray and protracted gamma-ray exposures at 3[degree]C and 19[degree]C. At 3[degree]C there was no significant difference between the OER for acute or protracted exposures (2.67 and 2.70 respectively). At 19[degree]C the OER was significantly lower for protracted than for acute exposures (2.06 compared with 2.58). There was no recovery between split-doses delivered under hypoxic conditions in contrast to the marked recovery which takes place when the irradiation is carried out in the air.