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    mathlover69's Avatar
    mathlover69 Posts: 1, Reputation: 1
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    #1

    Nov 22, 2011, 05:50 AM
    half -life
    The half-life of Radium -226 is about 1600 years. After 3000 years, what percentage P(t) of a sample of radium-226 remains. Assume you start with 100% = a
    Aurora2000's Avatar
    Aurora2000 Posts: 111, Reputation: 16
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    #2

    Nov 22, 2011, 08:43 AM
    The formula for the exponential decay process is

    where stands for the half life time, and the fraction of not decayed part after time .
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