Deep time Geological history of Earth Geological time units. Cambridge University Press, Isotopes are important to geologists because each radioactive element decays at a constant rate, which is unique to that element. As a substance ages, the relative amount of carbon decreases. 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. Just checking in. Area of Study.
Radiometric Dating: Methods, Uses & the Significance of Half-Life
5.7: Calculating Half-Life
This can be seen in the concordia diagram, where the samples plot along an errorchron straight line which intersects the concordia curve at the age of the sample. When a plant or an animal dies, it stops taking in carbon For example, all atoms of carbon have six protons, all atoms of oxygen have eight protons, and all atoms of gold have 79 protons.