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The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut to 50% of the original intensity.
Other forms of Radiometric Dating. Carbon 14's half-life is not nearly long enough to measure dates in the geological past. For that elements with a half life of many millions of years are required. Here are the half-lives of some other radioactive elements: 1  Uranium-238 ~half life=4.5 billion years. 2  Uranium-235 ~half life=704 million years.