3he helium age dating

[tritium, hydrocarbure halogene, eau souterraine, tritio, no metales, aguas subterraneas, compuesto organico del cloro, gasto, edad, plaine cotiere, new jersey, compose organochlore, llanura costera, metalloide, debit, age, hidrocarburos halogenados] Groundwater age dating through the combination of transient tracer methods (chlorofluorocarbons (CFCs) and tritium/helium 3 (3H/3He)) and groundwater flow path analysis is useful for investigating groundwater travel times, flow patterns, and recharge rates, as demonstrated by this study of the homogeneous shallow, unconfined Kirkwood-Cohansey aquifer system in the southern New Jersey coastal plain.

Apparent groundwater ages based on CFC- and 3H/3He-dating techniques and model-based travel times could not be statistically dif ferentiated, and all were strongly correlated with depth.

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He in rocks can be used to date geomorphologic surfaces.Apparent groundwater ages based on CFC- and 3H/3He-dating techniques and model-based travel times could not be statistically differentiated, and all were strongly correlated with depth.Confinement of 3He was high because of the rapid vertical flow velocity (of the order of 1 m/yr), resulting in clear delineation of groundwater travel times based on the 3H/3He-dating technique.The simulated groundwater travel times increase with depth in the aquifer, ranging from about 1.5 to 6.5 years for the shallow wells (screen bottoms 3–4 m below the water table), from about 10 to 25 years for the medium-depth wells (screen bottoms 8–19 m below the water table), and from about 30 to more than 40 years for the deep wells (screen bottoms 24–26 m below the water table).Apparent groundwater ages based on CFC- and He-dating techniques and model-based travel times could not be statistically differentiated, and all were strongly correlated with depth.

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