Abstract
Dr. F. G. Spear, Dr. L. H. Gray and Dr. J. Read report that the relation between the dose and the percentage residual mitosis in in vitro cultures of chick embryo fibroblasts after irradiation with D-D neutrons is not the same as the sigmoid relation found for γ-radiation, but is more nearly exponential. An exponential relation would be anticipated in the case of neutron irradiation if inhibition of mitosis resulted from the production of about 1,500 ion pairs in a volume of about 3 μ in diameter.
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Points from Foregoing Letters. Nature 142, 1081 (1938). https://doi.org/10.1038/1421081b0
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DOI: https://doi.org/10.1038/1421081b0