Uranium and thorium isotope concentrations in foraminiferal calcite

Details Uranium and thorium isotope concentrations in foraminiferal calcite Uranium and thorium isotope concentrations in foraminiferal calcite

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..258d&link_type=abstract

Earth and Planetary Science Letters, Volume 62, Issue 2, p. 258-262.

Physics

9

Scientific paper

Uranium and thorium isotope activities were measured by isotope dilution alpha spectrometry in four late Pleistocene and Holocene foraminiferal calcite samples. Sample cleaning methods were utilized to separate calcite tests from contaminating clay and surface oxide coatings. The maximum concentration of lattice bound uranium is 0.023 ppm (10 × 10-9 moles U/mole Ca), consistent with the lowest reported value, 0.025 ppm [1]. 230Th/234U activity ratios in samples cleaned as described above are much greater than one, indicating that the cleaning methods used do not effectively remove 230Th from the surfaces of the calcite. The upper limit for lattice bound 232Th is 0.039 ppm (17 × 10-9 moles Th/mole Ca).

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