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Continental degassing of 4He by surficial discharge of deep groundwater
Helium-4 is produced in the Earth’s crust and degassed to the atmosphere. Measurements of 4He and 81Kr dating in an aquifer in Brazil suggest that most crustal 4He reaches the atmosphere by the discharge of deep ...
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Chapter
Isotopic Tracing of Perchlorate in the Environment
Isotopic measurements can be used for tracing the sources and behavior of environmental contaminants. Perchlorate (ClO 4 − ) has been detected widely in groundwater, soils, fertilizers, plants, milk, and human ur...
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Chapter
Stable Isotopic Composition of Chlorine and Oxygen in Synthetic and Natural Perchlorate