Abstract
The natural actinides /sup 227/Ac, /sup 228/Th, /sup 230/Th, /sup 232/Th, /sup 234/Th, /sup 231/Pa, /sup 238/U, and /sup 234/U and the ..cap alpha..-emitting plutonium isotopes are determined in samples of suspended marine particulate material and sediments. Analysis involves total dissolution of the samples to allow equilibration of the natural isotopes with added isotope yield monitors followed by coprecipitation of hydrolyzable metals at pH 7 with natural Fe and Al acting as carriers to remove alkali and alkaline earth metals. Final purification is by ion exchange chromatography (Dowex AG1-X8) and solvent extraction for Pa. Overall chemical yields generally range from 50 to 90%. The method has been successfully interfaced with published methods to include the determination of /sup 55/Fe, /sup 137/Cs, /sup 90/Sr, and /sup 241/Am on the same samples.
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