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For a single element, these atoms are called isotopes.Because isotopes differ in mass, their relative abundance can be determined if the masses are separated in a mass spectrometer (see below , which permits the identification of daughter atoms formed by the decay process in a sample containing radioactive parent atoms.Isotopes are important for radiometric or age dating. Example: As uranium undergoes radioactive decay, it releases subatomic particles and energy, and ultimately decays to form lead.The radioactive isotope which undergoes decay is called the parent element.

As the uranium in rocks decays, it emits subatomic particles and turns into lead at a constant rate.

The parent element undergoes radioactive decay to form a daughter element.

In the example above, uranium is the parent element, and lead is the daughter element.

...igneous activity (both extrusive and intrusive) occurred in the Caledonian mountain belt, which stretched from New England, Nova Scotia, Newfoundland, Scotland, and Scandinavia to eastern Greenland.

Radiometric dating of granitic intrusions associated with the Caledonian orogeny yields ages between about 430 million and 380 million years.

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