Abstract
HENDRY, J. H., AND HOWARD, A. Neutrons and the Oxygen Effect: Corroboration of the Greater Effectiveness at High LET for Sensitization by Oxygen at Low Concentrations. Radiat. Res. 75, 529-540 (1978). Another comparison has been made between the sensitivity of cells at low oxygen concentration to 290-kV X rays or 14-MeV neutrons. The K values for oxygen with young sporelings of the fern Osmunda regalis were 35 4- 5 juM for X rays, and 23 4- 7 ,M for neutrons. The former value is higher than those reported for other cells. The trend toward a lower value for neutrons is consistent with two of three previous comparative measurements. This consensus of experimental evidence indicates that the component of the dose from neutrons, which demonstrates an oxygen effect, tends to show more affinity for sensitization by oxygen in the competitive-type reaction which leads to fixation of damage than does the dose from X rays. This qualitative feature should be considered in proposed mechanisms for the reduction in OER with an increase in ionization density, and these are discussed.
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