What is the half-life of the isotope

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Reference no: EM13540198

A radioactive isotope has an activity of 8.09 mCi. After 3.05 hours the activity is 6.31 mCi. What is the half-life of the isotope?
8.51 h

Need help on 2nd part

What is the activity after an additional 3.05 hours in mCi units?

Reference no: EM13540198

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