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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.
a group of genetically related radioisotopes in which each succeeding isotope is formed as a result of the alpha or beta decay of the preceding isotope. Each radioactive series has a parent isotope, which is the one with the longest half-life. Radioactive series end in stable isotopes. If a nucleus emits an alpha particle, its charge Z is reduced by 2 and its mass number A by 4. Upon emission of a beta particle, Z increases by 1, but A is unchanged.