[L. radius, a spoke of a wheel, hence, a ray] A method of determining the age of fossils and rocks using half-lives of radioactive isotopes.

Use of radioactive isotopes to estimate the age of a sample of water or rock; more precisely, radiometric dating. See also groundwater dating.

(n) - the use of radioactive isotopes to determine the absolute age of rocks and geologic events

A technique for estimating the age of an object by measuring the amounts of various radioisotopes in it.

the most reliable method of obtaining a 'date' for a rock depends upon the observation that the rate of decay of a radioactive element is a constant. The earliest methods, using uranium and thorium MINERALS as the starting material, yielded evidence that the extent of geological time was at least 2 million years. The development of knowle [..]

the most reliable method of obtaining a date for a rock depends upon the observation that the rate of decay of a radioactive element is a constant. The earliest methods, using uranium and thorium mine [..]