. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 938 ADVENTURES IN RADIOISOTOPE RESEARCH ScHOENHEiMEE,, whosG Untimely and tragic death is much to be de- plored. The discussion of the numerous important results obtained by ScHOENHEiMEE and RiTTENBERG and their collaborators*^*^ lies, how- ever, beyond the scope of this lecture. HEAVY WATER In 1931, Urey discovered deuterium, an isotope of hydrogen.^^^^ This important discovery made possible the labelling of hydrogen. Deuterium is not an ideal indicator, its properties differing appreciably. 60 80 100 120 mm. jTjct, 2.
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 938 ADVENTURES IN RADIOISOTOPE RESEARCH ScHOENHEiMEE,, whosG Untimely and tragic death is much to be de- plored. The discussion of the numerous important results obtained by ScHOENHEiMEE and RiTTENBERG and their collaborators*^*^ lies, how- ever, beyond the scope of this lecture. HEAVY WATER In 1931, Urey discovered deuterium, an isotope of hydrogen.^^^^ This important discovery made possible the labelling of hydrogen. Deuterium is not an ideal indicator, its properties differing appreciably. 60 80 100 120 mm. jTjct, 2. — Percentage distribution ratio of labelled sodium, potassium and deuterium oxide between plasma water and muscle water of equal weight. from those of hydrogen. The latter has a unique position : it is the sole element met with, though only transitorily, as a naked nucleus in chemical reactions. Chemical forces do not suffice to remove all electrons from any other element. Differences in the structure of the nucleus will therefore make themselves more noticeable in the chemical behaviour of hydrogen isotopes than in the case of any other element. Furthermore, the difference between the mass of the hydrogen atom and that of the deuterium atom amounts to as much as 100 per cent, while, for example,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hevesy, Georg von, 1885-1966. New York, Pergamon Press
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