old-198 is a β emitter used to treat leukemia. It has a half-life of 2.7 days. The dosage is 1.0 mCi/kg body weight.  How many half lives must pass for a 70 mCi dose to decay to 2.2 mCi?  How long (days) would it take for a 70 mCi dose to decay to an activity of 2.2 mCi?

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Chapter19: The Nucleus: A Chemist's View
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Gold-198 is a β emitter used to treat leukemia. It has a half-life of 2.7 days. The dosage is 1.0 mCi/kg body weight.

 How many half lives must pass for a 70 mCi dose to decay to 2.2 mCi?

 How long (days) would it take for a 70 mCi dose to decay to an activity of 2.2 mCi?

 
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