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20 July, 18:34

What fraction of a Sr-90 sample remains unchanged after 87.3 years?

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  1. 20 July, 19:03
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    Half life of Sr-90 is 28.8 years

    so:

    28.8 = ln 2/k

    k = - 0.0241

    - 0.0241 x 87.3 = - 2.10393

    e^-2.10393 = 0.12

    3/25 of the original sample will remain unchanged.
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