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Radioisotopes are unstable isotopes: they spontaneously decay (emitting radiation in the process -- thus making them radioactive).They continue to decay going through various transitional states until they finally reach stability. It will spontaneously decay until it transitions into Lead-206 (Pb206).Once the organism dies, however, it ceases to absorb carbon-14, so that the amount of the radiocarbon in its tissues steadily decreases.Carbon-14 has a half-life of 5,730 ± 40 years— during the succeeding 5,730 years.This belief is based upon three significant assumptions. Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food.

A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.Sometimes, scientists already know the age of the fossil because fossils of the same species have been found elsewhere and it has been possible to establish accurately from those when the dinosaur lived.Play a game that tests your ability to match the percentage of the dating element that remains to the age of the object.The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly.

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