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20 January, 23:09

Plutonium-239 (t1/2 = 2.41 * 104 yr) represents a serious nuclear waste hazard. if seven half-lives are required to reach a tolerable level of radioactivity, how long must 239 pu be stored? enter your answer in scientific notation.

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  1. 20 January, 23:20
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    The half-life of Plutonium-239, t1/2 is 2.41 * 10⁴ yrs

    time taken to reach tolerable level = seven half-lives

    = 7 x t1/2

    = 7 x 2.41 * 10⁴ yrs

    = 168700 yrs

    = 1.687 x 10⁵ yrs

    Hence, the period of time that Plutonium-239 must be stored is 1.687 x 10⁵ years.
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