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214Pb decays to Bi by β- decay which in turn decays to Po also by β-...

214Pb decays to Bi by β- decay which in turn decays to Po also by β- decay. If the half-lives of these decays are 26.8 min and 19.9 minutes respectively, calculate the activity of Bi at t=30 minutes knowing that at t=0 the radioactive sample contained 5.9 mCi of Pb and 1.0 mCi of Bi. How many nuclei of 214Bi have decayed between 1 hour and 2 hours?

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