(Answered) A drug prepared for a patient is tagged with 4399tc which

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A drug prepared for a patient is tagged with 4399Tc which has a half life of 6.05 h and an activity of 2.10 µCi when it was prepared. Suppose the drug containing 4399Tc is injected into the patient 1.20 h after it is prepared. What is its activity at the time it is injected?

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