. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 64 ADVENTURES IN RADIOISOTOPE RESEARCH activity was obtained we can conclude that hafnium does not belong to the elements showing a strong artificial radioactivity. This is partly due to the fact that the capture of neutrons by most of the hafnium isotopes leads, as explained later, to the formation of a heavier stable. 200 days F"ig. 1. Decay Curve of Hafnium. isotope ; as stable isotopes 176, 177, 178, 179, and 180 are known and only the absorption of neutrons by the last mentioned isotope can lead to the formati
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. 64 ADVENTURES IN RADIOISOTOPE RESEARCH activity was obtained we can conclude that hafnium does not belong to the elements showing a strong artificial radioactivity. This is partly due to the fact that the capture of neutrons by most of the hafnium isotopes leads, as explained later, to the formation of a heavier stable. 200 days F"ig. 1. Decay Curve of Hafnium. isotope ; as stable isotopes 176, 177, 178, 179, and 180 are known and only the absorption of neutrons by the last mentioned isotope can lead to the formation of an active product. The relative abundance of the isotopes in the naturally occurring element hafnium, as determined by Aston, is seen from Table 2. Table 2. — Relative Abvxdance of the Hafnium Isotopes Mass number Aljundance 176 5% 177 19% 178 28% 179 18% 180 30%. 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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