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    Decay of Radioactive Cobalt Sample

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    Cobalt 60 has a half life of 5.26 year. The Cobolt 60 in a certain radiation therapy unit must be replaced whenever its radioactivity falls to 80 percent of the original sample. If the original sample was purchased in 11/2002 when will it be necessary to replace the Cobalt 60?

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    Solution Summary

    The decay of radioactive Cobalt samples are examined. The half life is examined.