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A 135.5 mCi radioactive tracer is produced in a nuclear reactor. When it is delivered to...

A 135.5 mCi radioactive tracer is produced in a nuclear reactor. When it is delivered to a hospital 20 hours later, its activity is 70 mCi. The lowest useable level of activity is 10 mCi. For how long after delivery is the tracer useful (in hours)?

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