For example, the age of the Amitsoq gneisses from western Greenland was determined to be 3. The half-life of a first-order reaction under a given set of reaction conditions is a constant. Accurate radiometric dating generally requires that the parent has a long enough half-life that it will be present in significant amounts at the time of measurement except as described below under "Dating with short-lived extinct radionuclides"the half-life of the parent is accurately known, and enough of the daughter product is produced to be accurately measured and distinguished from the initial amount of the daughter present in the material. We will explore some of the most common types of radioactive dating and how the particular isotopes work for each type. Dergachev
Tauber, and K.
Figure 7 visually depicts this process. The carbon isotope would vanish from Earth's atmosphere in less than a million years were it not for the constant influx of cosmic rays interacting with atmospheric nitrogen. This chain eventually ends with the formation of a stable, nonradioactive daughter nuclide. Concepts Deep time Geological history of Earth Geological time units. New Tools for Isotopic Analysis".