Abstract
THE discovery both of artificial radioactive elements and heavy non-radioactive isotopes, together with methods of concentration of the latter, has opened up new methods of examining the reactions and movements of substances in the body.
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Use of Isotopes in Biology. Nature 143, 709–711 (1939). https://doi.org/10.1038/143709a0
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DOI: https://doi.org/10.1038/143709a0