The half-life of 131I is 8.04 days. (a) Calculate the

Chapter 44, Problem 31

(choose chapter or problem)

The half-life of 131I is 8.04 days. (a) Calculate the decay constant for this nuclide. (b) Find the number of 131I nuclei necessary to produce a sample with an activity of 6.40 mCi. (c) A sample of 131I with this initial activity decays for 40.2 d. What is the activity at the end of that period?

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