Isotopes, Radiogenic
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ISOTOPES, RADIOGENIC
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Cross-references Anaerobic Oxidation of Methane with Sulfate Astrobiology Biomarkers (Organic, Compound-Specific Isotopes) Cold Seeps Critical Intervals in Earth History Fe(II)-Oxidizing Prokaryotes Fe(III)-Reducing Prokaryotes Iron Sulfide Formation Isotope Fractionation (Metal) Nitrogen Methane, Origin Photosynthesis Sulfate-Reducing Bacteria Sulfur Isotopes
ISOTOPES, RADIOGENIC Bent T. Hansen University of Göttingen, Göttingen, Germany
Definition Radiogenic nuclides (more commonly referred to as “radiogenic isotopes”) are produced by a process of radioactive decay. Radioactive decay means that unstable isotopes (mother nuclides) are spontaneously transferred
into stable isotopes (daughter nuclides) by emission of particles and loss of energy (radioactive radiation).
Introduction The radioactive decay provides an accurate method of measuring the ages of rocks and minerals. This possibility was recognized both by Rutherford (1906) and Boltwood (1907) at the beginning of the twentieth century. However, the measurement and interpretation of variations in the isotopic composition of certain elements in natural materials were not possible until modern mass spectrometers were developed based on the design by Nier
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