82Rb with T1/2=1.25min, like 81Rb is a positron emitter that is useful for heart perfusion imaging....

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Physics

82Rb with T1/2=1.25min, like 81Rb is a positron emitter that isuseful for heart perfusion imaging. It can be produced by thenatural decay of 82Sr  (T1/2=25 days).

1) Suppose you have a sample of with 100 mCi of 82Sr. When willthe activity of 82Rb reach over 99% of the activity of 82Sr?

2) How much daughter activity (Question 1) will there be after20 minutes?

3) How much daughter activity (Question 1) will there be after20 days?

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