A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85 X 107 Bq.How long ago did it actually have a 4.00-mCi activity? Data from the appendices and the periodic table may beneeded for these problems.
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A 60Co source is labeled 4.00 mCi, but its present activity is found to be 1.85 X 107 Bq.How long ago did it actually have a 4.00-mCi activity?
Data from the appendices and the periodic table may be
needed for these problems.
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