(a) Why does a 99mTc generator need to be shipped once a week to hospitals? (b) What is the activity of a 1011-Bq 99mTc generator source 9 days after it was produced? (c) If the activity is 0.9 × 1011 Bq on Monday morning when it arrives, what will be the activity at the same time on Friday morning, the last day of the working week?
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