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Encyclopedia > Cosmogenic

Cosmogenic refers to rare radioactive isotopes created when cosmic radiation interacts with an atomic nucleus. These isotopes are produced on Earth, in Earth's atmosphere, and in extraterrestrial items such as meteorites.


Some elements that have cosmogenic isotopes are:

Because cosmogenic isotopes have very long lives (anywhere from thousands to millions of years), scientists find them useful for dating extremely old geological features and activities.


Refer to the indicated sources for more detailed information.


Sources:


Purdue University Prime Lab, "Cosmogenic nuclides" http://plsv1.physics.purdue.edu/primelab/cosmo.html


"Cosmogenic Exposure Dating and the Age of the Earth" http://www.geocities.com/earthhistory/tcn.htm


Cosmogenic Isotope Laboratory, Quaternary Research Center and Department of Earth and Space Sciences, University of Washington (note: State of Washington, not DC) http://depts.washington.edu/cosmolab/index.html


  Results from FactBites:
 
SAHRA - Isotopes (649 words)
Cosmogenic isotopes are a result of cosmic ray activity in the atmosphere.
Cosmogenic isotopes are also produced at the surface of the earth by direct cosmic ray irradiation of atoms in solid geologic materials.
Cosmogenic nuclides, since they are produced in the atmosphere or on the surface of the earth and have relatively short half-lives (10 to 30,000 years), are often used for age dating of waters.
Welcome to Adobe GoLive 5 (7213 words)
Cosmogenic nuclide exposure ages along a vertical transect in western Norway: implications for the height of the Fennoscandian Icesheet.
Cosmogenic analysis of glacial terrains in the eastern Canadian arctic: a test for inherited nuclides and the effectiveness of glacial erosion.
Cosmogenic Neon in ultramafic nodules from Asia and in quartzite from Antarctica.
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