Dating Groundwater With Tritium

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Dating Groundwaters with Tritium - Testa - - Major . . .
USGS Groundwater Dating Lab
Dating Groundwaters with Tritium | Request PDF
DATING OF GROUNDWATER WITH TRITIUM AND $sup 14$C . (Journal . . .
Tritium/3He dating of shallow groundwater - ScienceDirect
Groundwater age-dating simplified - USGS
Tritium/ 3 He dating - Lamont-Doherty Earth Observatory
dating of groundwater with tritium | SpringerLink
Groundwater Age-Dating for Water Resource Characterization . . .
Tracing and Dating Young Ground Water - USGS
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Although tritium can occur as a gas, its most common form is in water because, like nonradioactive hydrogen, radioactive tritium readily reacts with oxygen to form water, which allows groundwater to be dated . As tritium replaces one of the stable hydrogens in the water molecule, (H 2), it is referred to as the molecule HTO, or tritiated water (T 2 0) . Similarly to water, tritium is colorless and odorless .
3 H/ 3 He Dating Background . Tritium (3 H, half-life of 12 .43 years (Unterweger and others, 1980)) has provided an excellent tracer of young waters . 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 .
In the absence of strong dispersion the ratio of atmospherically derived tritium (3H) and its stable daughter, helium 3 (3He), can be used to accurately date shallow groundwater with ages ranging . . .
Age dating of the water has been tried for the validation of ground water transport models . Thus, several tritium and /sup 14/C-analyses have been carried out on water samples from deep boreholes drilled within SKB's (Swedish Nuclear Fuel and Waste Management Company) study sites .
Besides dating of groundwater combined tritium /SHe data are val- uable parameters for calibration of groundwater transport models (see [20]) . Further studies at locations with different geohydraulic parameters should be made to establish the tritium / 3 He method for studies of shallow groundwater circu- lation on a broader basis .
The TBAC method can also be used as a screening tool to determine if other, more complicated age- dating methods are needed to resolve questions of groundwater age . The TBAC method can be used retroactively to assign age categories to any sample previously analyzed for tritium , provided that the sampling date and location are known .
Because 3 He is a gas, the application of the tritium / 3 He method to dating of groundwater depends strongly on the degree of confinement of 3 He trit in the groundwater . The confinement of 3 He trit is mainly determined by the ratio of advection to dispersion in water parcels moving away from the water table .
Tritium /helium-3 age dating is not affected by dilution with old (or pre-modern) groundwater and yields both the mean age of the modern age component and, when compared with tritium in precipitation curves, the mixing ratio between modern and pre-modern water .
Tracing and Dating Young Ground Water . Data on concentrations of environmental tracers, such as chlorofluorocarbons (CFCs), tritium (3 H), and other chemical and isotopic substances in ground water, can be used to trace the flow of young water (water recharged within the past 50 years) and to determine the time elapsed since recharge . Information about the age of ground water can be used to define recharge rates, refine hydrologic models of ground-water systems, predict contamination . . .
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Dating Groundwater With Tritium