Abstract
L. H. Gray and J. Read, working on the biological effects of neutrons, have used the ionization produced in air in small graphite ionization chambers as a measure of neutron dose. Experiments have now been made which make it possible to correlate the ionization with the actual increment of energy per unit volume of tissue due to the recoil atoms generated by the neutrons. Calculations based on interaction cross-sections agree with two different lines of experimental investigation in showing that a neutron beam which produces 1 E.S.U./c.c. of ionization in a graphite chamber will give the same energy absorption per unit volume of tissue as 7 roentgens of γ-rays (20 per cent).
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Points from Foregoing Letters. Nature 144, 446 (1939). https://doi.org/10.1038/144446c0
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DOI: https://doi.org/10.1038/144446c0