2) in unconsolidated glacial and alluvial aquifers during 1999 to determine the regional quality of ground water beneath about 790 mi of developed land and to gain a better understanding of the natural and human factors that affect the water quality (Glass, 2001).
Of the 35 wells sampled, 31 had water analyzed for atmospherically derived substances to determine the ground waters travel time from its point of recharge to its point of use or dischargealso known as ground-water age.
Paul began his career at USGS as a Hydrologist in San Antonio, Texas (1984) and has since worked in Austin, Texas (1986-1993) and Indianapolis, Indiana on a variety of groundwater and water chemistry studies.
He also worked as a Hydrogeologist with STS Consultants in Green Bay, Wisconsin (1982-84). M., 2016, Application of hydrogeology and groundwater-age estimates to assess the travel time of groundwater at the site of a landfill to the Mahomet Aquifer, near Clinton, Illinois, with a section on Regional Indications of Recharge to the Mahomet Aquifer from Previously Collected Tritium and Pesticide Data, by Buszka, P.
In the atmosphere, these substances have mixed and spread worldwide.
These atmospheric substances, such as tritium (H) in water vapor from detonation of nuclear bombs in the 1950s and early 1960s,and chlorofluorocarbons (CFCs) from refrigeration and other uses from the 1950s through the 1980s, dissolve in precipitation, become incorporated in the Earths hydrologic cycle, and can be found in ground water that has been recharged within the past 50 years.
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. Tritium measurements alone can be used to locate the depth of the mid-1960s bomb peak, but, because of radioactive decay, many samples may need to be collected and analyzed today to locate its position.
If the atoms of H, or 3.24 picocuries per liter, p Ci/L.
Ground water moves slowly from its point of recharge to its point of use or discharge.
This water starts as rain and melting snow that soak into the ground as recharge.
The detection of chlorofluorocarbons and tritium in ground water provides valuable information that can be used for dating and tracing young ground watertechniques that help water-resources managers develop management strategies for shallow ground-water systems.
Young ground water in shallow ground-water systems Young ground water is typically found at depths from 0 to 100 feet in unconsolidated sediments and at depths up to 1000 feet in fractured-rock systems.