Science for kids radiometric dating carbon 14 purity dating
In contrast to the most simple radiometric dating techniques, isochron dating, which can be used for many isotopic decay sequences (e.g.
rubidium-strontium decay sequence), does not require knowledge of the initial proportions.
The processes that form specific materials are often conveniently selective as to what elements they incorporate during their formation.
In the ideal case, the material will incorporate a parent nuclide and reject the daughter nuclide.
In this case, the only daughter nuclides to be found through examination of a sample must have been created since the sample was formed.
The uranium-lead radiometric dating scheme is one of the oldest available, as well as one of the most highly respected.
It has been refined to the point that the error in dates of rocks about three billion years old is no more than two million years.
In this case, the half-life is usually given is for the entire chain, rather than just one step in the chain.