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ULTRAFAST CHEMICAL SEPARATIONS
SEPARATION TIME: 100 s
SEPARATION TECHNIQUE: Extraction, ion exchange
PRODUCTION MODE: Batch
REFERENCE: Chayawattanangkur, K., Herrmann, G., and Trautmann, N., “Heavy isotopes of 229–232Ac,” J. Inorg. Nucl. Chem.35, 3061–3073 ( 1973).
PROCEDURE: Irradiated thorium salt was dissolved in a mixture of α-hydroxyisobutyric acid (HIB) and its ammonium salt, mixed with Dowex-50W X8 resin, and filtered. Actinium was retained by the resin along with yttrium, lanthanides, alkali, and alkaline earths. The resin was washed with NH4Cl (5%), and then with HIB (1M, pH 3.6); actinium was then eluted with HIB (1M, pH 4.65). The solution containing actinium was passed through a layer of Voltalef coated with HDEHP, which retained actinium. The Voltalef layer was washed with HCl (0.05M); actinium eluted with HCl (2M) and coprecipitated with Fe(OH)3.
SEPARATION TIME: 2.7 s
SEPARATION TECHNIQUE: Volatilization
PRODUCTION MODE: Autobatch
REFERENCE: Rudolph, W., Kratz, K. L., and Herrmann, G., “Half-lives, fission yields, and neutron-emission probabilities of neutron-rich antimony isotopes,” J. Inorg. Nucl. Chem.39, 753–758 ( 1977).
PROCEDURE: From the sample dissolved in HCl (12M), the hydrides of antimony, selenium, tellurium, and arsenic were volatilized by a burst of nascent hydrogen generated by the addition of zinc powder. H2Se and H2Te were absorbed on quartz wool coated with 0.5M NaOH. The gas containing AsH3 and SbH3 was passed through KClO3 – HCl (9M) solution, which decomposes the hydrides and oxidizes arsenic and antimony to (V). The solution was passed through a layer of plastic powder coated with HDEHP, which retains only antimony. Also refer to Kratz, K. L., et al., Nucl. Phys.A317, 335–362 (1979). Also see procedure Sc-1 under “Selenium,” Kratz, J. V., and Herrmann, G., J. Inorg. Nucl. Chem.32, 3713–3723 (1970).