Statistics – Computation
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..86..129w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 86, no. 2-4, Dec. 1987, p. 129-173.
Statistics
Computation
30
Cosmic Rays, Planetary Evolution, Solar System, Abundance, Chemical Composition, Computational Astrophysics, Planets, Solar System, Isotopes, Abundance, Evolution, Nucelosynthesis, Time Scale, Calculations, Procedure, Techniques, Isotopic Ratios, Moon, Spectrometry, Theoretical Studies, Laboratory Studies, Strontium, Rubidium, Condensation, Anomalies, Radioactivity, Formation, Earth, Samples, Lunar, Diagrams, Comparisons, Models, Dynamics, Structure, Samples, Terrestrial, Samples, Meteorite, Experiments, Ch
Scientific paper
For matter that has been removed from a region of nucleosynthetic activity and the effects of interactions with nuclear active particles, the only changes in nuclear abundances that can occur in an isolated system derive from the decay of radioactive nuclei of an element to yield the nucleus of another element. These two related nuclei furnish the absolute chronometers of geologic and cosmic time, through the decay of spontaneously radioactive parent nuclei and the accumulation of daughter nuclei. For systems related to such cosmic processes as the formation of the solar system from the precursor interstellar medium, and involving the very early evolution of the sun, there may arise considerable complexity, due to the intrinsic isotopic heterogeneity of the medium and the presence of short-lived nuclei.
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