Abstract
The short-lived nuclear isomers, Pb 207 m (0·8 sec) and Ir 191 m (4·9 sec) have been identified and characterized after rapid anion-exchange separation from their long-lived parents, Bi 207 (8 years) and Os 191 (16 days). Diffusion of daughter activities from the resin to solution phase is sufficiently rapid to permit satisfactory separation from the parent activities. In the strong base anion exchanger used, the diffusion coefficient of tracer Pb(II) was found to be 7·8 × 10 −8 cm 2/sec at 25°C. The yield of the Pb 207 m separation, as calculated from diffusion theory and the measured diffusion coefficient of Pb(II), is in fair agreement with that observed. Results are discussed in regard to general applicability of the ion-exchange technique for rapid separations.
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