Cfc Water Dating

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USGS Groundwater Dating Lab - Water Resources
CFCs / Introduction to Water Dating and Tracer Analysis . . .
Tracing and Dating Young Ground Water - USGS
USGS Groundwater Dating Lab - Water Resources
PDF Tracing and Dating Young Ground Water - USGS
Groundwater age dating with chlorofluorocarbons - Oster . . .
PDF Ground-water Age Dating and Other Tools Used to Assess . . .
Reliability of current CFC data for age dating of water . . .
Age Dating of Shallow Groundwater with Chlorofluorocarbons . . .
(PDF) 36Cl in modern groundwater dated by a multi-tracer . . .
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CFC dating of groundwater is based on the assumption that historical CFC concentrations in the unsaturated zone, or in the air that was last in contact with the water , are known or can be calculated . The effect of unsaturated zone thickness on CFC dating of groundwater is discussed in the section on unsaturated zone thickness
Water dating with CFC -11 and CFC -12 is possible because: i . the atmospheric mixing ratios of these compounds are known and/or have been reconstructed over the past 50 years ii . the Henry's law solubilities in water are known, and iii . concentrations in air and young water are relatively high and can be measured .
CFC dating is best suited for ground water in relatively rural environments where localized contamination, such as that from septic systems, sewage effluent, landfills, or urban runoff, can contain CFC concentrations in excess of that of atmospheric sources .
The Reston Groundwater Dating Laboratory provides analytical services for chlorofluorocarbons ( CFCs ), sulfur hexafluoride (SF 6) and other dissolved gases including N 2, Ar, CO 2, CH 4, O 2 . The data generated by the Groundwater Dating Laboratory are being used throughout the USGS in hydrologic studies .
developed a method to date ground water on the basis of chlorofluorocarbon ( CFC ) content of the water that is practical, cost-effective, and applicable to most shallow ground- water systems . Sampling for tracers The feasibility of using CFCs as tracers of recent recharge and indicators of ground- water age was first recognized in the 1970s
Abstract . CFCs are useful tracers for age dating young water . Two critical assumptions are typically invoked: (1) the initial concentration needs to be known, and (2) the tracer must be stable . A series of 8000 CFC air data from four sites on the west European continent (from high-alpine clean air down to urban sites) show site-specific CFC . . .
tively useful for age dating . CFC's have been used to measure ground- water age because this method gives more accurate estimates of age (plus or minus 2 years) and can resolve better the dates of recharge of younger ground water (early 1990's), which is needed to study water -quality problems in relatively shallow aquifers
Age dating of water based on dissolved CFCs and Krypton-85 has been applied extensively for many years . CFCs were adopted as an approach for water dating due to the availability of global input functions and because of a straightforward methodology . In the last decade, due to international treaties, CFCs production and atmospheric concentrations of some trace gases (e .g . Krypton-85) are . . .
Abstract . Groundwater age dating through the combination of transient tracer methods (chlorofluorocarbons ( CFCs ) and tritium/helium 3 ( 3 H/ 3 He)) and groundwater flow path analysis is useful for investigating groundwater travel times, flow patterns, and recharge rates, as demonstrated by this study of the homogeneous shallow, unconfined . . .
36Cl in modern groundwater dated by a multi-tracer approach (3H/3He, SF6, CFC -12 and 85Kr): a case study in quaternary sand aquifers in the Odense Pilot River Basin, Denmark
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Cfc Water Dating

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