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The attractiveness of chlorine in hydrologic studies is that it is highly soluble, exists in nature as a conservative non-sorbing anion, does not participate in redox reactions, and has some quickly identifiable sources (e.g., seawater).The abundance of Cl/Cl ratios (Bentley et al., 1986; Phillips et al., 1986; Nolte et al., 1991). | Using cosmogenic nuclides in glacial geology | Sampling strategies cosmogenic nuclide dating | Difficulties in cosmogenic nuclide dating | Calculating an exposure age | Further Reading | References | Comments | Cosmogenic nuclide dating can be used to determine rates of ice-sheet thinning and recession, the ages of moraines, and the age of glacially eroded bedrock surfaces.Cosmogenic nuclide dating uses the interactions between cosmic rays and nuclides in glacially transported boulders or glacially eroded bedrock to provide age estimates for rock at the Earth’s surface.

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He is presently employed in the Space & Atmospheric Sciences Group at the Los Alamos National Laboratory.

The addition of Cl can be evaluated by measurement of the Cl and other ionic concentrations in the water, in-situ production can be estimated after a measurement of aquifer U and Th concentrations, and precipitation input values can be estimated using present-day local values.

For the determination of water transit times between two sampling locations instead of the absolute age of the water, the value measured at the upgradient location is used as the input value.

The half-life of this hydrophilic nonreactive isotope makes it suitable for dating in the range of 60,000 to 1 million years.

Additionally, large amounts of Cl has seen use in other areas of the geological sciences, including dating ice and sediments (Nishiizumi et al., 1983; Phillips et al.,1983).