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- W2271308092 abstract "High precision measurement of /sup 234/U//sup 238/U ratios and U concentrations in profiles of Atlantic and Pacific waters have been made in order to determine the degree of heterogeneity of these parameters in the open ocean. The measurements were made possible by the development of mass spectrometric techniques to measure /sup 234/U//sup 238/U to +/- approx. 5 per thousand (2sigma) and U concentrations to +/- 2 per thousand with 2-5 x 10/sup 9/ atoms of /sup 234/U. A /sup 233/U-/sup 236/U double spike is used to correct for instrumental mass fractionation. The average /sup 234/U//sup 238/U for 4 samples from the Pacific profile is 144 +/- 4 per thousand higher than the equilibrium atomic /sup 234/U//sup 238/U ratio (5.47 x 10/sup -5/). The average for 5 samples in the Atlantic profile is identical (144 +/- 4 per thousand). A comparison of /sup 234/U//sup 238/U values for samples above and below the thermocline shows similar homogeneity. U concentrations normalized to 35 per thousand salinity are the same within approx. 1% (3.215 +/- 6 to 3.257 +/- 6 ppb) but clearly show variation greater than the +/- 2 per thousand error. The reason for this fine scale variation requires further investigation. Themore » authors data suggest that /sup 234/U//sup 238/U in the open ocean is homogeneous to within 8 per thousand. This is consistent with the long residence time of U and the long /sup 234/U half life compared to the residence time of water in the deep ocean. Similar measurements on marine pore fluids which can easily be done using the authors technique should provide constraints on the U flux across the sediment-water interface (524).« less" @default.
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- W2271308092 date "1985-01-01" @default.
- W2271308092 modified "2023-09-28" @default.
- W2271308092 title "Precise measurements of /sup 234/U//sup 238/U and U concentrations in profiles of Pacific and Atlantic waters" @default.
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