Question: Why is half-life important in radiometric dating?

The half-life of the uranium-238 to lead-206 is 4.47 billion years. The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years. These differing rates of decay help make uranium-lead dating one of the most reliable methods of radiometric dating because they provide two different decay clocks.

What is a half-life in radiometric dating?

Halflife: While the moment at which a particular nucleus decays is random, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing dating techniques.

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