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The technique has potential applications for detailing the thermal history of a deposit. A carbon-based life form acquires carbon daitng its lifetime. These temperatures are carbkn determined in the lab by artificially resetting sample minerals using a high-temperature furnace. Accuracy of radiometric dating[ edit ] Thermal ionization mass spectrometer used in radiometric dating. Carbon has a half life of years, meaning that years after an organism dies, half of its carbon atoms have decayed to nitrogen atoms.
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But carbon dating won't work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old. To determine the ages of these specimens, scientists need an isotope with a very long half-life. Some of the isotopes used for this purpose are uranium, uranium and potassium, each of which has a half-life of more than a million years.
Unfortunately, these elements don't exist in rockx fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma. Fossils, however, form in sedimentary rock -- sediment carboj covers a dinosaur's body, and the sediment and the carobn gradually turn into rock. But this sediment doesn't typically include the necessary isotopes in measurable amounts. Fossils can't form in the igneous rock that usually does contain the isotopes. The extreme temperatures of the magma would just destroy the bones. So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash. These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary rock formed.
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