Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon in which trace radioactive impurities were selectively incorporated when they were formed.
Radiometric dating or radioactive dating as it is sometimes called is a method used to date rocks and other objects based on the known decay rate of radioactive isotopes different methods of radiometric dating can be used to estimate the age of a variety of natural and even manmade materials.
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Radiometric dating is based on the halflives of the radioactive isotopes these halflives have been measured over the last 4090 years they are not calibrated by fossils.
Since radiometric dating techniques are based on the halflife phenomena of radioactive nuclides lets explore it a little radioactive atoms are unstable so they decay into a something else the rate that atoms decay or break down is not constant.
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Geologists use radioactive dating techniques to estimate the age of rocks and fossils these are based on the concept that the rocks contain a small concentration of a radioactive substance which decays at a fixed rate.
The oldest rocks on earth found in western greenland have been dated by four independent radiometric dating methods at 3738 billion years rocks 3436 billion years in age have been found in southern africa western australia and the great lakes region of north america.
Many absolute dating techniques take advantage of radioactive decay whereby a radioactive form of an element is converted into another radioactive isotope or nonradioactive product at a regular rate.