Earth Science Basics. Once an organism dies, the C begins to decay. In many cases, the daughter nuclide itself is radioactive, resulting in a decay chaineventually ending with the formation of a stable nonradioactive daughter nuclide; each step in such a chain is characterized by a distinct half-life. Oxford, UK: Radiometric Dating and the Geological Time Scale: Upgrade to Premium to add all these features to your account! Radiogenic isotope geology 2nd ed.
This involves the alpha decay of Sm to Nd with a half-life of 1. Index Fossils as Indicators of Time. We designate a specific group of atoms by using the term "nuclide.
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