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Groundwater dating and residence time measurements

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However, little is known about the age of groundwater in the Siberian Arctic region.In order to determine the residence time of permafrost groundwater in eastern Siberia, transient tracers including tritium () were used to analyze a mixture of supra-permafrost and intra-permafrost groundwater in the middle of the Lena River basin.Excel workbooks for calculation and presentation of environmental tracer data for simple groundwater mixtures. In: IAEA Guidebook on the Use of Chlorofluocarbons in Hydrology. Atmospheric environmental tracers commonly used to date groundwater on time scales of years to decades include CFC-11, CFC-12, CFC-113, SF6, 85Kr, 3H, and 3H/3H(0), where 3H(0) refers to initial tritium (3H tritiogenic 3He) (Cook and Herczeg, 2000).Interpretation of age from environmental tracer data may be relatively simple for a water sample with a single age, but the interpretation is more complex for a sample that is a mixture of waters of varying ages.

For example, the selection of atmospheric environmental tracers can be changed to reflect analytes of interest, the input tracer data can be modified to reflect local conditions or different time scales, and the analytes of interest can include other types of non-point-source contaminants such as nitrate (Böhlke, 2002).

It can be produced by irradiating lithium metal or lithium bearing ceramic pebbles in a nuclear reactor.

Tritium is used as a radioactive tracer, in radioluminescent light sources for watches and instruments, and, along with deuterium, as a fuel for nuclear fusion reactions with applications in energy generation and weapons.

However, neither the composition nor the evolution of the upper layers of the Earth can be explained by local-scale geochemistry.

It is the open-system nature of geochemistry in this environment that provides most of its explanatory power, as well as its intellectual challenge.