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OpenStudy (anonymous):
A radioactive isotope has an activity of 9.18 mCi. After 3.85 hours the activity is 6.24 mCi. What is the half-life of the isotope? Which I got to = 6.92 hr Now it wants to know "What is the activity after an additional 3.85 hours in mCi units?" Any help would be greatly appreciated!!
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