Simultaneous determination of trace uranium and thorium by radiochemical neutron activation analysis |
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Authors: | L. Benedik A. R. Byrne |
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Affiliation: | (1) Jo ef Stefan Institute, University of Ljubljana, Jamova 39, P.O. 100, SLO-61111 Ljubljana, Slovenia |
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Abstract: | A method for the simultaneous, radiochemical neutron activation analysis of uranium and thorium at trace levels in biological materials is described, based on a technique known as LICSIR, in which a double neutron irradiation is employed. In the first, long irradiation233Pa (27.0 d) is induced by neutron capture on232Th and then the sample is cooled for several weeks. A second short irradiation to induce239U (23.5 m) is followed by a rapid sequential radiochemical separation by solvent extraction of239U with TBP and233Pa with TOPO. Chemical yields of239U and233Pa were measured for each sample aliquot using added235U and231Pa tracers from the -spectra of the separated fractions. The technique was validated by quality control analyses. |
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