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For nearly all practical purpose, bismuth can be regarded as not radioactive. There is only one isotope of bismuth ordinarily found in nature, 209Bi, and though it is radioactive, it is only barely so, having a half life of 19,000,000,000,000,000,000 years, a fact only recently discovered. Like all elements, there are synthetic radioactive isotopes of bismuth.
First answer by GeoHarvey. Last edit by GeoHarvey. Contributor trust: 261 [recommend contributor recommended]. Question popularity: 0 [recommend question].

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