Tritium Age Dating Water
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Groundwater age-dating simplified - USGS
USGS Groundwater Dating Lab - Water Resources
Groundwater Age-Dating for Water Resource Characterization . . .
Tracing and Dating Young Ground Water - USGS
Tritium / Introduction to Water Dating and Tracer Analysis . . .
Introduction to Water Dating and Tracer Analysis / Tritium . . .
Tritium/ 3 He dating - Lamont-Doherty Earth Observatory
Dating cave drip water by tritium - ScienceDirect
DATING OF GROUNDWATER WITH TRITIUM AND $sup 14$C . (Journal . . .
PDF 9 . Groundwater Dating
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A new USGS report documents a simple method to classify groundwater age as premodern (recharged before 1953), modern (recharge in 1953 or later), or a mix of the two . The method—tritium-based age classification, or TBAC—requires just a single measurement of tritium , along with knowledge of sample date and location .
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 .
Less model-dependent than tritium age dating : Traditional tritium age-dating is confounded by mixing between old tritium -dead water and young tritiated water , and requires modeling, assumptions or independent estimates of the mixing ratio to convert measured tritium activity into a groundwater age .
Other chemical dating tools . Tritium (half-life 12 .4 years) provides another useful tracer of young ground water . Although it is difficult to evaluate age information from tritium data alone, age commonly can be reliably determined from data on tritium (3 H) and its decay product, helium-3 (3 He) .
Age-dating using tritium is based on the radioactive decay of tritium to helium-3 (3 He) after rainwater penetrates the ground during recharge . Because of the irregularly shaped bomb peak, tritium data can often give ambiguous ages .
Introduction to Water Dating and Tracer Analysis GNS provides a number of complementary age tracer methods to date water samples . These include tritium , CFCs, SF6, radon, carbon-14, and stable isotopes, covering a range of ages from less than six months to tens of thousands of years .
Tritium (3H or T) is the radioactive isotope of hydrogenthat decays with a half life of 12 .43 years to its stable daughter 3He . Tritium is produced naturally in the upper atmosphere by interaction ofnitrogen, and, to a lesser extent, oxygen with cosmic rays . Afteroxidationto HTO, it takes part in the natural water cycle .
Tritium drip- water dating . The presented method is based on the radioactive hydrogen isotope tritium . It has a half-live of 12 .32 years ( Lucas and Unterweger, 2000) and is used in studies of groundwater and surface water to distinguish old (>50 years) from more recently infiltrated water ( Clark and Fritz, 1997 ) .
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 .
Tritium -free groundwaters are considered "submodern" or older . Tritium concentration units The use of tritium in dating groundwaters relies on knowledge of its concentration in meteoric waters , to which both natural and anthropogenic sources contribute . The most widely used unit of concentration of tritium is the Tritium Unit, or TU, where:
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Tritium Age Dating Water
