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22 April, 15:02

A sample of radium-226 contains 1.0*108 atoms of radium-226. How many atoms of radium-226 will remain in the sample after three half-lives?

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  1. 22 April, 17:32
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    After 3 half lives it will be (1/2) ^3 or 1/8 of original

    so

    1/8 times 10^8=1.25 x 10⁶ atoms left
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