Groundwater Dating Tritium
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USGS Groundwater Dating Lab
Groundwater age-dating simplified - USGS
Dating Groundwaters with Tritium | Request PDF
Tritium/3He dating of shallow groundwater - ScienceDirect
Tritium/ 3 He dating - Lamont-Doherty Earth Observatory
Tracing and Dating Young Ground Water - USGS
Age Dating by Tracers - Isodetect
PDF 9 . Groundwater Dating
Tritium as an indicator of modern, mixed, and premodern . . .
PDF 5 .15 Groundwater Dating and Residence-time Measurements
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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 .
The method—tritium-based age classification, or TBAC—requires just a single measurement of tritium , along with knowledge of sample date and location . For example, if the TBAC method determines that groundwater is premodern, that groundwater is less likely to contain chemicals, such as current-use pesticides, that came into use after 1953 .
Tritium (³H) is one of the most common radioisotopes used to identify the presence of modern groundwater recharge and estimate apparent groundwater ages (1) . Tritium , a short-lived radioactive . . .
If we assume that no tritiogenic ~He is lost by diffusion across the groundwater table, the tritium /3He age of groundwater can be calculated by: r = Tl/2/ln 2 In(1 + [-~He]/[3H]) (3) where r = tritium/~He age in years . This determination is independent of the initial tritium concentration .
Because 3He is a gas, the application of the tritium /3Hemethod to dating of groundwater depends strongly on the degree ofconfinementof 3Hetritin the groundwater . The confinementof3Hetritis mainly determined by the ratio of advection to dispersion in waterparcelsmoving away from the water table .
Tracing and Dating Young Ground Water . Data on concentrations of environmental tracers, such as chlorofluorocarbons (CFCs), tritium (3 H), and other chemical and isotopic substances in ground water, can be used to trace the flow of young water (water recharged within the past 50 years) and to determine the time elapsed since recharge . Information about the age of ground water can be used to define recharge rates, refine hydrologic models of ground-water systems, predict contamination . . .
Rule of thumb for qualitative groundwater dating based on tritium content (modified according to Clark & Fritz 1997) <0 .5 TU water older than 1952 (pre-modern) 0 .5 - ~ 3 TU mostly mixture of premodern and young (<10 a) water 3 - 10 TU mostly younger than 10-15 years or dominant share premodern
Groundwater Dating Water moves through the hydrological cycle at different rates . Water vapor . . . of the thermonuclear peak can provide groundwater age information . Tritium is a short-lived isotope of hydrogen with a half-life of 12 .32 years (Lucas and Unterweger, 2000) . It is directly incorporated into the water
Categorical classification of groundwater age is often used for the assessment and understanding of groundwater resources . This report presents a tritium -based age classification system for the conterminous United States based on tritium (3H) thresholds that vary in space and time: modern (recharged in 1953 or later), if the measured value is larger than an upper threshold; premodern . . .
www .ees .nmt .edu › outside › courses › hyd558 › downloads › Set_8a_IntroDating › GWDating_ResTime .pdf
Groundwater Dating and Residence-time Measurements F . M . Phillips New Mexico Tech, Socorro, NM, USA and M . C . Castro University of Michigan, Ann Arbor, USA 5 .15 .1 INTRODUCTION 452 5 .15 .2 NATURE OF GROUNDWATER FLOW SYSTEMS 452 5 .15 .2 .1 Driving Forces 452 5 .15 .2 .2 Topographic Control on Flow 453 5 .15 .2 .3 Hydraulic Conductivity and Its Variability 453
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Groundwater Dating Tritium
