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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.
1 Radioactivity. 2  This breakdown is called radioactive decay of the unstable nucleus of the atom (radioisotope). 3  In the breakdown of the unstable nucleus, energy is released by the emission of alpha, beta and gamma ionising radiation (see diagram below). This breakdown is called radioactive decay of the unstable nucleus of the atom (radioisotope). 2  In the breakdown of the unstable nucleus, energy is released by the emission of alpha, beta and gamma ionising radiation (see diagram below).