Posted by **amy** on Thursday, February 3, 2011 at 1:58pm.

An investigator receives Co-60 (5.27 year half life) for use in a research study.

Unfortunately the Co-60 is contaminated with Cs-137 (30.0 year half life). The

initial Co-60 activity is 400 times the initial Cs-137 activity. How long after the

initial assay will the Cs-137 activity be 0.2 times the Co-60 activity?

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