Dating rocks

Radioactive dating

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British Broadcasting Corporation Home. Rocks often contain traces of uranium. This is unstable and eventually decays to lead, which is stable. The age of a rock can be calculated if its ratio of uranium to lead is known. The half-life of uranium is 4. If a rock has a uranium to lead ratio of 1: This would make it 4. Back to Radiation for life index. Fun dating website usernames using the Internet Explorer 6 browser to view the BBC website.

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This page has been archived and is no radioactive dating rocks updated. Find out more about page archiving. BBC Radio 1 BBC 1Xtra. Print Science Uses of radioisotopes. Dating rocks Radioactivity can be used to date rocks. The older the rock, the lower its uranium to lead ratio: Young rocks have a high uranium to lead ratio Very old rocks have a low uranium to lead ratio The table shows how this works.

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1.6 Absolute Dating of Rocks