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Also the argon-argon dating technique can be used for the potassium-argon sequence to ensure that no initial and half-life of the parent isotope, which can be obtained from tables such as the one given in : Although radiometric dating is accurate in principle, the precision is very dependent on the care with which the procedure is performed.
The possible confounding effects of initial contamination of parent and daughter isotopes have to be considered, as do the effects of any loss or gain of such isotopes since the sample was created.
Additionally, elements may exist in different isotopes, with each isotope of an element differing only in the number of neutrons in the nucleus.
A particular isotope of a particular element is called a nuclide. That is, at some random point in time, an atom of such a nuclide will be transformed into a different nuclide by the process known as radioactive decay.
In the ideal case, the material will incorporate a parent nuclide and reject the daughter nuclide.
Nuclides useful for radiometric dating have half-lives ranging from a few thousand to a few billion years.continue to make remarkable discoveries, such as that a huge meteorite that fell in the Gulf of Mexico wiped out the dinosaurs—all except the birds, the only surviving dinosaurs."Radiometric dating" can reveal the age (often tens of millions of years) of a rock or fossil or a tiny grain of pollen by measuring how much its radioactive elements have disintegrated.Although decay can be accelerated by radioactive bombardment, such bombardment tends to leave evidence of its occurrence.Therefore, in any material containing a radioactive nuclide, the proportion of the original nuclide to its decay product(s) changes in a predictable way as the original nuclide decays.