Abstract
THE modifying effect of oxygen on the biological response to 14-MeV neutrons has been discussed in relation to the use of these neutrons in radiotherapy1–5; but no direct experimental data were cited. We have recently obtained for another purpose some data for 14-MeV neutrons on yields of chromatid-type aberrations in meristematic cells of bean root tips in aerated and anoxic conditions. The dose modification factor for true aberrations was about 1.5 and for non-staining lesions (‘gaps’)6 about 1.3. These values are very little greater than those found for chromosome damage in the same biological material with 3-MeV neutrons7 or in Tradescantia micro-spores with fission neutrons8.
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