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Dating groundwater

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The guidebook also presents a number of case studies providing insight into how various isotopes have been used in aquifers around the world.The methods, findings and conclusions presented in this publication will enable students and practicing groundwater scientists to evaluate the use of isotope dating tools for specific issues related to the assessment and management of groundwater resources.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. In systems younger than the mid-1960s, the bomb peak will not be present due to radioactive decay.

It is therefore important to continually refine our interpretation of hydrogeologic, geochemical and isotopic data to better understand the spatial and temporal movement of water in the subsurface.With our ever-increasing understanding of the magnitude of climate variations during the last 40 000 years and the impact of our industrialised society on groundwater quality and quantity, hydrogeologists will continue to require more information about the rate of groundwater movement on scales from the subannual to millenium.The increasing national and international demand for water has led to increasing reliance on subsurface storage, both for naturally and artificially recharged water.Beta Analytic is offering Oxygen-18 and Deuterium stable isotope measurements for water samples at no additional cost for samples submitted for radiocarbon dating.These analyses can also be ordered on a standalone basis without radiocarbon dating.1. Before beginning the collection from the wellhead/spigot, allow the water to run for sufficient time so that the water being collected has come directly from the aquifer.C), was first produced artificially in 1940 by Martin Kamen and Sam Ruben, who bombarded graphite in a cyclotron at the Radiation Laboratory at Berkeley, CA, in an attempt to produce a radioactive isotope of carbon that could be used as a tracer in biological systems (Kamen (1963) [101]; Ruben and Kamen (1941) [102]).