Abstract
Dicentric and total aberration yields induced in human lymphocytes by 15-MeV neutrons under conditions of oxygenation and of anoxia have been fitted to a dose-response curve using the function Y = αD + βD 2. An oxygen-enhancement ratio (OER) ranging from 3.7 at low yields to 1.6 at high yields was calculated from the co-efficients of the dicentric yield curves and evidence is presented which suggests that oxygen does not act as a dose-modifying agent in this system. High dose RBE values of 1.2 and 2.1 with respect to 250 kVp X-rays for oxygenated and anoxic conditions were also obtained. Coefficients for total aberration yield gave similar values to dicentrics for both OER and RBE
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