Dating of Young Groundwater

The hydrogeological functioning of four different areas in a complex evaporite-karst unit of predominantly aquitard behavior in S Spain was investigated. Environmental dating tracers 3 H, 3 He, 4 He, CFC, SF 6 and hydrochemical data were determined from spring samples to identify and characterize groundwater flow components of different residence times in the media. Ne values show degassing of most of the samples, favored by the high salinity of groundwater and the development of karstification so that the concentration of all the considered gases were corrected according to the difference between the theoretical and the measured Ne. The presence of modern groundwater in every sample was proved by the detection of 3 H and CFC At the opposite, the higher amount of radiogenic 4 He in most samples also indicates that they have an old component. The large SF 6 concentrations suggest terrigenic production related to halite and dolomite. Particularly, GA 50 is derived from the median groundwater age and is presented as a new way of interpreting mixed groundwater age data. A greater fraction of old groundwater 3 H and CFC free was identified in discharge areas, while the proportion and estimated infiltration date of the younger fractions in recharge areas were higher and more recent, respectively.

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calculate how many nuclei are in 1 MBq (~27 μCi) of tritium(3H) (t½ = yr.). x y 40K to 40Ar (K/Ar dating) or the decay of U or U to their.

After meeting all of the contestants it will be up to you to pick your favourite and perhaps propose a second date. On your groundwater samples that is. Starting to find some answers on water chemistry of baseflow samples from the Yukon. The first step in groundwater dating…picnic style. Photo: Matt Herod.

Before I introduce you to our contestants I should briefly make it clear why groundwater dating is important. Understanding how old groundwater is may be one of the most, if not the most important aspect of protecting groundwater as a resource and preventing depletion of groundwater reserves from overpumping. There may be lots of it, but the aquifer could take a long time to recover. Think of it like this: the water being pumped has to come from somewhere. Pumping could draw more water into the aquifer from recharge not always an option to replace what is lost, the water pumped could be from groundwater already stored in the aquifer, or it could be groundwater that was leaving the aquifer via discharge into a river or lake that is now diverted to your well.

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Isotopes in the Water Cycle pp Cite as. Unable to display preview. Download preview PDF.

In order to apply 3H/3He age dating method by using he- Recharge and Discharge by Using the Tritium, Helium-3 Dating Technique”: In Lieu of a Preface​.

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However, this method has rarely been applied to karstified aquifers and in particular to drip water in caves, despite the importance of the information which may be obtained. Besides the determination of transfer times of climate signals from the atmosphere through the epikarst to speleothems as climate archives, 3 H- 3 He together with Ne, Ar, Kr, Xe data may also help to give new insights into the local hydrogeology, e. In order to check the applicability of 3 H- 3 He dating to cave drips, we collected drip water samples from three adjacent caves in northwestern Germany during several campaigns.

The use of 14C in dating groundwater was first discussed by Muen- ductivity, water levels) and long-term recharge processes (3H and 14C).

Radiocarbon decay is rarely used to assess the residence time of modern groundwater due to the low resolution of its long half-life in comparison to the expected range of ages. Nonetheless, the modern 14C peak induced by the nuclear bomb tests traces efficiently the impacts of recent human activities on groundwater recharge, as well as for tritium.

A simple lumped parameter model LPM was implemented in order to assess the interest of 14C and 3H nuclear peaks in a highly anthropized aquifer system of southeastern Spain under intense agricultural development. It required i to assess a correction factor for modern 14C activities and ii to reconstruct the 3H recharge input function, affected by irrigation.

In such a complex hydrogeological context, an exponential model did not provide satisfying results for all samples. A better solution was reached by taking into account the qualitative recent variation of the recharge rates into a combined exponential flow and piston flow model. Apart from presenting an uncommon approach for 14C dating of modern groundwater, this study highlights the need of considering not only the variation of the tracer but also the variability of recharge rates in LPMs.

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Love, Lies and What They Learned

Application of environmental isotope techniques for determining the origin and mechanisms of recharge of the Rashche Spring. T1 – Application of environmental isotope techniques for determining the origin and mechanisms of recharge of the Rashche Spring. N2 – This study is focused on the groundwater system of the Rashche Spring which serves as the main source of drinking water for the City of Skopje, located at the foot of the widely karstified Zeden massif. Investigations were made to define the mechanisms of groundwater recharge and its residence time.

AB – This study is focused on the groundwater system of the Rashche Spring which serves as the main source of drinking water for the City of Skopje, located at the foot of the widely karstified Zeden massif.

X-MOL提供的期刊论文更新,Journal of Hydrology——Groundwater dating tools (​3H, 3He, 4He, CFC, SF6) coupled with hydrochemistry to.

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Chlorofluorocarbons 3H/3He and 85Kr are tracers of atmospheric origin that can be used to date groundwater over periods from 0 to 40 years. In suitable.

Tritium 3 H or T is the radioactive isotope of hydrogen that decays with a half life of Tritium is produced naturally in the upper atmosphere by interaction of nitrogen, and, to a lesser extent, oxygen with cosmic rays. After oxidation to HTO, it takes part in the natural water cycle. These tests which were mainly performed in the early s, led to an increase of tritium in precipitation over the continents of the northern hemisphere from roughly 5 TU to levels of the order of TU.

One TU Tritium Unit means a tritium to hydrogen ratio of 10 Whereas the addition of bomb tritium to the environment practically eliminated the use of natural tritium as a tracer, it offered a new tool, i. If the tritium delivery as a function of time can be reconstructed, this penetration process can be used for quantitative studies of water movement through identification of the bomb peak in certain ground water bodies. However, there are natural limits to this method because tritium decay and dispersion make it increasingly difficult to identify the bomb peak in groundwater.

These problems can be overcome by using tritium in combination with its decay product 3 He 3 He trit as first suggested by Tolstykhin and Kamensky and experimentally confirmed by Torgersen et al. If both the tritium and 3 He trit concentrations are measured in TU, it can be calculated as.

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See more details. Paper Information. Radioisotopes, as a new achievement in the environmental sciences, have found significant development in water resources management, especially in dating, aquifer recharge management, and the role of contaminants in water resources pollution.

Recent rain water now has a higher 3H concentration than water recharged during the nuclear-weapons-testing period (decay lines in Fig. 1 now.

Tritium, the radioactive isotope of hydrogen, is a perfect conservative tracer of water cycle in the environment. In hydrology, hydrogeology, limnology, and ocean research, knowledge of tritium concentration is, a powerful tool for groundwater age dating and for the estimation of circulation patterns and aquifer vulnerabilities. In our tritium measurement, water samples of 0. The main principle of this method is that tritium decays to 3 He. This method is the most sensitive one that can be used to detect low-level tritium concentrations of environmental waters.

The tritium concentration of a sample can be calculated from the measured 3 He. The most important step of tritium measurements is the mass spectrometric analysis of the tritiogenic 3 He. The metal vessel containing the water sample is attached to the line via VCR connectors. Having evacuated the system, the valve of the metal vessel is opened to let the helium in.

During sample admission, the water trap and the molecular sieve trap are held at liquid nitrogen temperature, and the empty trap of the cryo is held at 25K, while the charcoal trap is held at 10K. The water vapour is streamed through the capillary carrying the helium atoms into the line.

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