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An atom whose nucleus is not stable.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
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An [[atom]] whose nucleus is not stable.<ref>Wile, Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
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Radioactive isotopes have many applications in science and medicine. One application is [[radiocarbon dating|carbon 14 dating]].<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/cardat.html</ref> This allows scientists to calculate the age of the remains of once-living things.
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Radioactive isotopes have many applications in [[science]] and [[medicine]]. One application is [[radiocarbon dating|carbon 14 dating]].<ref>http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/cardat.html</ref> This allows [[scientist]]s to calculate the age of the remains of once-living things.