Astronomy: General

A Dictionary of Astronomy A Dictionary of Earth Sciences Further reading

exposure age

A Dictionary of Astronomy | 1997 | Copyright

exposure age The period of time during which a meteoroid has been exposed to cosmic radiation in space; also known as cosmic-ray exposure age, or radiation age. This is usually the time between a meteoroid leaving its parent body (such as an asteroid) and arriving on Earth. Bombardment of the meteoroid by cosmic rays in space produces radioactive isotopes (such as helium-3, neon-21, and argon-38), or phenomena such as fission tracks, whose abundances can be used to estimate the exposure age. Typical exposure ages range from a few million years to a few hundred million years.

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exposure age

A Dictionary of Earth Sciences | 1999 | | Copyright

exposure age (sun-tan age) The period during which a rock has been exposed at the lunar surface as measured by fission tracks induced by exposure to solar flare particles, which penetrate to depths of less than 0.5cm. The average exposure age is less than three million years.

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AILSA ALLABY and MICHAEL ALLABY. "exposure age." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "exposure age." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-exposureage.html

AILSA ALLABY and MICHAEL ALLABY. "exposure age." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-exposureage.html

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