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    Rates of Radioactive Decay

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    A one- milligram sample of Cu-64 (nuclear mass =63.92 amu) has an activity of 3.82*10^3 Ci.

    1a) How many atoms are in the sample?
    b) What is the decay rate in atoms/s?
    c) What is the rate constant in min-1?
    d) What is the half-life in minutes?

    2) What percentage of Cu-64 will decay in 4.00hr?

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    Solution Preview

    See the attached files for the solution.

    The nuclear mass of is where
    Thus, a single atom mass is:

    Thus, in a sample we have:

    So in this sample we have atoms of

    A unit of one Ci is given by:

    So the decay ...

    Solution Summary

    This a tutorial on how to calculate the rates of decay.