polleycolton3864 polleycolton3864

24-04-2024
Chemistry

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A 228Th source is labeled 4.50 mCi, but its present activity is found to be 1.04 ✕ 107 Bq. (a) What is the present activity in mCi? (b) How long ago (in y) did it actually have a 4.50 mCi activity?

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