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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.
Besides 209 Bi, the most stable bismuth radioisotopes are 210m Bi with a half-life of 3.04 million years, 208 Bi with a half-life of 368,000 years and 207 Bi, with a half-life of 32.9 years, none of which occur in nature.All other isotopes have half-lives under 1 year, most under a day.ismuth (Bi) has no stable isotopes, but does have one very long-lived isotope; thus, the standard atomic mass can be given as 208.9803987(16) u.