Abstract
The uranium content in sea water was determined by counting the fission tracks on muscovite immersed in a condensed aqueous solution during the reactor neutron irradiation. For the condensation from sea water, uranium was coprecipitated with aluminium phosphate. After the precipitate had been dissolved in a small amount of dilute nitric acid, an aliquot of this solution in a quartz ampoule was taken up by a piece muscovite and irradiated with reactor neutrons (KUR). After etching of the muscovite with hydrofluoric acid solution, a microphotograph was taken. The fission fragment tracks on the muscovite surface were counted and the sea-water samples were compared with standard uranium solutions. The uranium content in sea water could be determined easily as 3.40 ± 0.12 μg 1 -1 without any further chemical purification.
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