- Bertram Boltwood
Infobox Scientist
name = PAGENAME
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birth_date =July 27 ,1870
birth_place =Amherst, Massachusetts
death_date = 1927
death_place =Hancock Point, Maine )
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nationality =United States
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alma_mater =Yale University
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known_for =radiochemistry
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footnotes =Bertram Borden Boltwood (
July 27 ,1870 Amherst, Massachusetts - 1927,Hancock Point, Maine ) was an American pioneer ofradiochemistry .He was a graduate of
Yale University , and taught there 1897-1900. He measured the age of rocks by the decay of uranium to lead, in 1907. He got results of ages of 400 to 2200 million years, the first success ofradiometric dating . More recently, older mineral deposits have been dated to about 4.4 billion years old, close to the best estimate of theage of earth .Boltwoodite is named after him.References
*Boltwood, Bertram (1907) "The Ultimate Disintegration Products of the Radio-active Elements. Part II. The disintegration products of uranium." in "American Journal of Science" series 4, volume 23, pages 77-88.
External links
* [http://www.pbs.org/wgbh/aso/databank/entries/do07ra.html Science Odyssey: Radiometric dating finds Earth is 2.2 billion years old]
* [http://www.minrec.org/labels.asp?colid=196 The Mineralogical Record - Label Archive ] at www.minrec.org
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