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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
Two different radioisotopes of uranium are found occurring naturally in rocks. They decay via a series of alpha and beta particle emissions from the nuclei of their atoms to different stable isotopes of lead. The decay chains have different half-lives. These radioactive decay mechanisms can be used to date ancient rocks and fossils.
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