Knowing the rate of decay of one nuclear species (nuclide) into another, scientists can, in principle, use the ratios of decay products as a clock to measure the...
..the solar system; for this reason they are often called long-lived radionuclides.
The ability to quantify the geologic time scale—i.e., to date the events of the geologic past in terms of numbers of years—is largely a result of coupling radiometric dating techniques with older, classical methods of establishing relative geologic ages. ...water of the Nubian sandstone aquifer, which extends through several countries in an area that is now the Sahara desert.
The water is being used extensively for water supply and irrigation purposes.
Research in the Earth sciences has benefited greatly from the use of radiometric-dating techniques, which are based on the principle that a particular radioisotope (radioactive parent) in geologic material decays at a constant known rate to daughter isotopes.