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The distribution of Am between selected solid and liquid phases hag been studied using initial 24'Am solutions with a molarity smaller than 1 x 10-11. The synthetic and natural groundwaters used have pH values in the 7-8 range and a total alkalinity of approximately 1 mN which is mainly due to bicarbonate. Mruw spectrometric isotope dilution was utilized to determine the amount of Am in the solution phru+einitially and after equilibrium W= attained. Using this sensitive technique, 7 x 10* atoms of 241Am were accllrately measured. Our results indicate that the percent of Am lost to the walls of the container in the absence of geologic material varies from 35 to 84, The Am sorption codiicient determined is on the order of 10s ml/g for clinoptilol;te, 104 ml/g for tuff consisting mainly of alkali feldspax and cristobaiite, and 103 ml/g for romanecbite.

A carrier-free chemical procedure has been developed to separate and purify nanogram quantities of the long-lived isomer of 236 Np ( 236i Np, tm = 1.2 χ 10 5 a) and 236 Pu from gram quantities of uranium. A target containing 2 g of highly enriched 23 5 U was irradiated for 3960 μ Ah with 20.1 MeV deuterons. A total of 4.45 χ 10 13 atoms of 236, Np and 1.14 χ 10 14 atoms of 236 Pu was recovered.

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