Question

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

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

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

2) How much daughter activity (Question 1) will there be after 20 minutes?

3) How much daughter activity (Question 1) will there be after 20 days?

Science   Advanced-Physics   
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Homework Answers

Answer #1

A(Rb) at t= 20 mins is 3.669 * 10^6 Bq

And similarly for t = 20 days = 20 * 24 * 60 = 28800 mins

A(Rb)= 6.166 Bq

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