Abstract
IN connexion with the half-life standardization of lutetium-176 (half-life = 2.2 × 210 yr.) a 1-g quantity of commercially available lutetium oxide was obtained having a purity of 99.9 per cent. (Standardization work was carried out by Mr. Donhoffer of the Institut für Radiumforschung und Kernphysik, Vienna 9.) During measurement, however, it soon became evident that other activities were also present and in sufficiently large quantities to make the proposed measurement impossible. The sample was, therefore, subject to a nuclear spectroscopic analysis by means of a 400-channel pulse height analyzer for a 26-h period. The results of this analysis (Fig. 1) clearly indicated the presence of several activities resulting from the decay of thorium, the decay scheme for which is shown in Fig. 2.
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TITZE, H. Thorium Content of, and its Separation from, Commercially Available Pure Lutetium Oxide. Nature 201, 66 (1964). https://doi.org/10.1038/201066a0
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DOI: https://doi.org/10.1038/201066a0
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