Abstract
Mature sperm from Drosophila melanogaster males that had been irradiated with several doses of 0.68-MeV neutrons or 250-kVP X-rays, were tested for the presence of translocations, sex-linked recessive lethal mutations and dominant lethal mutations. The data support the conclusions that: ( 1) neutrons induce all these effects by the action of single proton tracks; ( 2) some X-ray induced translocations and dominant lethals are produced by single electron tracks while the remainder are produced by at least two tracks; ( 3) X-ray-induced recessive lethal mutations are produced by single electron tracks. The relative biological effectiveness (RBE) for all the effects was > 1.
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