Groundwater age dating example of chronometric dating
Uncertainty in age because of analytic uncertainty is approximately ± 0.5 years.
Larger uncertainties in age result from corrections in defining the tritiogenic H input has been relatively constant and therefore influenced to a lesser extent by hydrodynamic dispersion (Solomon and Sudicky 1991). Practical applications of environmental tracers to dating young ground water often depend on sampling from pre-existing domestic, industrial, and municipal-supply wells that, because of their construction, intercept relatively large open intervals and can produce mixed waters.
Effects of mixing can be more significant when waters are sampled from relatively large intervals in aquifers. N., 1992, Use of chlorofluoromethanes (CCl) as hydrologic tracers and age-dating tools: Example - The alluvium and terrace system of central Oklahoma: Water Resources Research, v.
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However, under transient conditions, such as for waters recharged prior to the 1960s bomb pulse, dispersion can cause more than 50 percent differences between calculated He ages determined near the water table should closely reflect the average vertical velocity.
See for example Plummer and others (1998a, 1998b, 2000). B., and Krause, D., Jr., 1980, Isotopic fractionation of helium during solution: A probe for the liquid state: J.
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