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The objective of this paper is to discuss how environmental tracers are used to characterise young groundwater systems so that more researchers, water managers, and policy-makers are aware of the value of environmental tracer approaches and can apply them in appropriate ways.We also discuss areas where additional research is required to improve ease of use and extend quantitative interpretations of tracer results. TY - JOURT1 - Dating of 'young' groundwaters using environmental tracers T2 - Isotopes in Environmental and Health Studies AU - Newman, Brent D.AU - Osenbrück, Karsten AU - Aeschbach-Hertig, Werner AU - Solomon, D.Kip AU - Cook, Peter AU - Rózánski, Kazimierz AU - Kipfer, Rolf PY - 2010Y1 - 2010N2 - Many problems related to groundwater supply and quality, as well as groundwater-dependent ecosystems require some understanding of the timescales of flow and transport.In the atmosphere, these substances have mixed and spread worldwide.

As these substances are virtually inert in ground water, unaffected by ground-water chemistry and unaffected by contamination from most anthropogenic sources, He dating complements existing capabilities within the U. 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. B., 1993, Chlorofluorocarbons (CCl) as Dating Tools and Hydrologic Tracers in Shallow Ground Water of the Delmarva Peninsula, Atlantic Coastal Plain, United States: Water Resources Research, v. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Among the elements, fluorine ranks 24th in universal abundance and 13th in terrestrial abundance. CFCs also can be used to trace seepage from rivers into ground-water systems, provide diagnostic tools for detection and early warning of leakage from landfills and septic tanks, and to assess susceptibility of water-supply wells to contamination from near-surface sources.During the past 50 years, human activities have released an array of chemical and isotopic substances to the atmosphere.

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