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Posted by / 21-May-2020 12:57

The two cascades are different—235U becomes 207Pb and 238U becomes 206Pb.

What makes this fact useful is that they occur at different rates, as expressed in their half-lives (the time it takes for half the atoms to decay).

Uranium comes in two common isotopes with atomic weights of 235 and 238 (we'll call them 235U and 238U).

Both are unstable and radioactive, shedding nuclear particles in a cascade that doesn't stop until they become lead (Pb).

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Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence.

In a 704-million-year-old rock, 235U is at its half-life and there will be an equal number of 235U and 207Pb atoms (the Pb/U ratio is 1).

In a rock twice as old there will be one 235U atom left for every three 207Pb atoms (Pb/U = 3), and so forth.

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