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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.
The energy of the radiation for a given isotope is considered to be constant for the life of the isotope. Review: 1  The half-life of radioisotopes varies from seconds to billions of years. 2  Carbon-dating uses the half-life of Carbon-14 to find the approximate age of an object that is 40,000 years old or younger.