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A device used in radiation therapy for cancer contains 0.40 g of cobalt _27^60 text(Co) (59.933 819 u). The half-life of _27^60 text(Co) is 5.27 yr.

A device used in radiation therapy for cancer contains 0.40 g of cobalt _27^60 text(Co) (59.933 819 u). The half-life of _27^60 text(Co) is 5.27 yr. Determine the activity of the radioactive material.

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