The Reston Groundwater Dating Laboratory

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Tritium input to ground water has occurred in a series of spikes following periods of atmospheric testing of nuclear devices that began in 1952 and reached a maximum in 1963-1964. Concentrations of 3H in precipitation have decreased since the mid-1960s bomb peak, except for some small increases from French and Chinese tests in the late 1970s. Radioactive decay of 3H produces the noble gas helium-3 3He. Tritium measurements alone can be used to locate the depth of the mid-1960s bomb peak, but, because of radioactive decay, many samples may need to be collected and analyzed today to locate its position. In systems younger than the mid-1960s, the bomb peak will not be present due to radioactive decay. Although initial 3H concentrations have decreased because of radioactive decay, measurements of 3H and tritiogenic 3He define a quasi-stable tracer of initial 3H input to ground water and may be used to determine the position of the mid-1960s bomb peak in recharge areas. Additionally, location of the mid-1960s bomb peak provides information on recharge rate Schlosser and others, 1988, 1989; Solomon and Sudicky, 1991; Solomon and others, 1992, 1993; Ekwurzel and others, 1994. Locating the position of the mid-1960s bomb peak is difficult due to the required high density of vertical sampling and, therefore, is often an impractical means of obtaining ground-water age information. Geological Survey for dating of young ground water, such as, uses of chlorofluorocarbons and sulfur hexafluoride, and can be applied to dating water recharged since about 1965. In these cases, the measured Ne content assumed to be derived solely from the atmosphere can be used to calculate the additional He He terr. The 3He trit then becomes where R terr. R ter has to be determined from the isotope measurements of tritium-free water in the aquifer under investigation. For dating studies of waters from crystalline rocks, or even for waters from alluvial aquifers associated with crystalline bedrock, it is best to sample several old tritium-free waters to aid in defining R terr. The 3H from 1963-64 atmospheric nuclear-bomb testing was clearly evident in the tritiogenic 3He at a depth of 5 to 10 meters in the saturated zone. This difference was attributed to incomplete 3He confinement and dispersive mixing with deeper water. Helium-3 confinement has also been shown to be a function of the vertical flow velocity recharge rate and dispersivity. Schlosser and others 1989 calculated significant 3He loss across the water table to the atmosphere at vertical flow velocities of less than 0. Uncertainty in age because of analytic uncertainty is approximately ± 0. Larger uncertainties in age result from corrections in defining the tritiogenic 3He, the requirement that the parcel of water remain confined following infiltration, and mixing effects caused by hydrodynamic dispersion. If 3He is lost by diffusion to the unsaturated zone air, younger ages are derived. The age of the young fraction s in ground-water mixtures can be particularly useful when assessing the susceptibility of ground-water resources to contamination from anthropogenic sources. If the mixture contains multiple fractions of young water, the resulting age is regarded as a mean age of the young fraction s in the mixture. Effects of mixing can be more significant when waters are sampled from relatively large intervals in aquifers. Mixing, if it occurs, may not be readily apparent if the concentration of a particular constituent such as dissolved Cl - or Ca 2+ in the aquifer is uniform over the depth interval sampled. In any mixture containing a fraction of post-bomb water and a fraction of pre-bomb water, the detectable 3H and 3He trit is attributed to the young water fraction. See for example Plummer and others 1998a, 1998b, 2000. Geological Survey Water-Resources Investigations Report 93-4054, 47p. Flow patterns, age of groundwater, and influence of lakewater leakage: Water Resources Research, v. Tracing the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia. Dating the young fraction in groundwater mixtures in the Upper Floridan aquifer near Valdosta, Georgia. Ground Water, 38 2 , 264-283. M, 1976, Trichloromethane, a new hydrologic tool for tracing and dating ground water: Bloomington, Indiana, Ph. Dissertation, Department of Geology, Indiana University.

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