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Tritium-helium dating

Jean-Baptiste P, Petit JR, Lipenkov VY, Raynaud D, Barkov N (2001) Constraints on hydrothermal processes and water exchange in Lake Vostok from helium isotopes. Nature 411 460-462 Jean-Baptiste P, Raynaud D, Mantisi F, Sowers T, Barkov N (1993) Measurement of helium isotopes in Antarctic ice preliminary results from Vostok. C R Acad Sci Paris 316 491-497 Jenkins WJ (1976) Tritium-helium dating in the Sargasso Sea A measurement of oxygen utilization rates. Science 196 291-292... [Pg.694]

CFCs in the Ocean. Long-Term Tracer Changes. Oxygen Isotopes in the Ocean. Stable Carbon Isotope Variations in the Ocean. Tritium-Helium Dating. [Pg.138]

Air-Sea Transfer N2O, NO, CH4, CO. Carbon Cycle. Tritium-Helium Dating. [Pg.187]

A major task in the tritium-3He dating method is the identification of 3He based on the background of the atmospheric helium, which has a 3He 4He ratio that varies from one place to another within a wide range of values. [Pg.230]

Szabo Z., Rice D. E., Plummer L. N., Busenberg E., Drenkard S., and Schlosser P. (1996) Age dating of shallow groundwater with chlorofluorocarbons, tritium/helium 3, and flow path analysis, southern New Jersey coastal plain. Water Resour. Res. 32, 1023-1038. [Pg.2748]

Eaton, G. F., Hudson, G. B., and Moran, J. E. 2004. Tritium-helium-3 age-dating of ground-water in the Livermore Valley of California.in Radioanalytical Methods in Interdisciplinary Research. Laue, C. A. and Nash, K. L., eds. pp. 235-245. Washington, DC ACS. [Pg.443]

Tritium (tm = 12.3 y) is used to date relatively recent samples in a technique similar to carbon-14 dating. For example, tritium is used to determine the age of groundwater. The ratio of and 3H abundances in rain and snow is stable over time. However, once the water seeps into the ground, it cannot mix with the water in the atmosphere, and the tritium nuclei that decay are not replaced. To determine the age of groundwater, we can measure the concentrations of both tritium and its daughter nuclide, helium-3. The age of the groundwater can help determine properties such as the depth of its source. [Pg.967]

During the last decade a different track has been followed for the tritium dating method, namely, measurement of the decay product 3He (section 10.1) as a substitute for the initial tritium concentration. Tritium-derived 3He (tritiogenic helium) is built up in the groundwater as the contained tritium disintegrates hence, the 3H 3He ratio decreases with age. To facilitate the calculations both nuclides are expressed in TR (tritium ratio) units, that is, 3H H and 3He H ratios of 10-18. In principle, the age of groundwater can be determined by measuring the tritium concentration left... [Pg.229]

See other pages where Tritium-helium dating is mentioned: [Pg.22]    [Pg.139]    [Pg.140]    [Pg.141]    [Pg.142]    [Pg.143]    [Pg.143]    [Pg.144]    [Pg.145]    [Pg.146]    [Pg.22]    [Pg.139]    [Pg.140]    [Pg.141]    [Pg.142]    [Pg.143]    [Pg.143]    [Pg.144]    [Pg.145]    [Pg.146]    [Pg.3092]    [Pg.693]    [Pg.704]    [Pg.729]    [Pg.145]    [Pg.607]    [Pg.198]    [Pg.225]    [Pg.646]    [Pg.317]    [Pg.320]    [Pg.310]    [Pg.199]    [Pg.690]    [Pg.696]    [Pg.728]    [Pg.646]   
See also in sourсe #XX -- [ Pg.139 , Pg.140 , Pg.141 , Pg.142 , Pg.143 , Pg.144 , Pg.145 ]



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