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Decay Chains

U-238 (4.5 b.y.) Th-234 (24.5 days) Pa-234 (1.14 min.)

dU-238 /dt = dTh-234/dt = dPa-234/dt etc.

λ(U-238)*N(U-238) = λ(Th-234)*N(Th-234) = λ(Pa-234)*N(Pa-234) etc.  Or…

N(U-238)/t(U-238) = N(Th-234)/t(Th-234) = N(Pa-234)/t(Pa-234) etc.

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