In each of the three generalized approaches (single-sample-based models, statistical approach, and geochemical mass-balance approach), successful application depends on scrutiny of the isotopic (C content of DIC in aquifers.The recently developed graphical analysis method is shown to aid in determining which approach is most appropriate for the isotopic and chemical data from a groundwater system.
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This review discusses first the geochemical processes behind each of the single-sample-based models, followed by discussions of the statistical approach and the geochemical mass-balance approach.
Finally, the applications, advantages and limitations of the three groups of models/approaches are discussed.
Technische Schwierigkeiten dieser Bestimmung, welche für diese Art der experimentellen Methode charakteristisch sind, besonders Adsorptionsprobleme, und die Methoden mit welchen diese Schwierigkeiten überwunden wurden, werden im Detail besprochen.
Als Ergebnis einer gründlichen Analyse aller erhaltenen Resultate wird eine Halbwertszeit von 5760 ± 50 Jahren angenommen, wobei die angegebene Ungenauigkeit aus dem wahrscheinlichen Fehler aller Resultate abgeschätzt wurde.
Ionization Inverse Square Law Interaction of RT/Matter Attenuation Coefficient Half-Value Layer Sources of Attenuation -Compton Scattering Geometric Unsharpness Filters in Radiography Scatter/Radiation Control Radiation Safety Radio-carbon dating is a method of obtaining age estimates on organic materials.
The word "estimates" is used because there is a significant amount of uncertainty in these measurements.
The method was developed immediately following World War II by Willard F.
Libby and coworkers and has provided age determinations in archeology, geology, geophysics, and other branches of science.
The half-life of carbon-14 has been determined with an accuracy believed to be higher than that of previously reported values.
Carbon dioxide was liberated by the action of perchloric acid on barium carbonate which contained C dioxide were analyzed mass spectrometrically, and other portions were diluted quantitatively with inert carbon dioxide and counted in the NBS length-compensated internal gas counters.
) — a quantity that is essential for estimation of radiocarbon age of DIC in groundwater.