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Q: Consider the following B- decay chain with the half-lives indicated. 210 Pb (22y) -> 210 Bi (5d) -> 210 Po A sample contains 30 Mbq

Consider the following B- decay chain with the half-lives indicated.

210 Pb (22y) -> 210 Bi (5d) -> 210 Po A sample contains 30 Mbq of 210 Pb and 15 MBq of 210 Bi at time zero.

(a) Calculate the activity of 210 Bi at time = 10 d.

(b) If the sample were originally pure 210 Pb, then how old is it at time t = 0?

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