Commonly used for Radiometric Dating
|Dating Sample||Key Fission Product|
|Lutetium-176||Hafnium-176||37.8 billion||early Earth|
|Uranium-238||Lead-206||4.468 billion||10 million to origin of Earth|
|Uranium-235||Lead-207||704 million||10 million to origin of Earth|
|Rubidium-87||Strontium-87||48.8 billion||10 million to origin of Earth|
|Potassium-40||Argon-40||1.277 billion||100,000 to origin of Earth|
|Carbon-14||Nitrogen-14||5730 ± 40||0-100,000|
the half-life durations listed in the text
sections of this tutorial are
rounded off for
uranium-238 and potassium-40.
Copyright © 1999-2012 by Dennis O'Neil. All rights reserved.