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IJSTR >> Volume 4 - Issue 5, May 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

New Concept For Calculating The Age Of A Fossil Bone By Uranium-Series Method

[Full Text]



Samer Farkh, Abdallah Zaiour, Jalal Abdallah, Samir Farkh, Hanadi Ismail, Ahmad elMoll, Mirvat Ballout, Nafez Harb, Katia Haddad, Zaher Zeaiter



Keywords: bone, age, uranium, thorium, equilibrium, radioactive chain



Abstract: The age of a fossil bone can be determined based on the chain of radioactive uranium, as far as it behaves like a closed system. Uranium is incorporated into the bone after its death and disintegrates into thorium. The calculation of age is based on the assumption that living tissue does not contain uranium and at the entrance of uranium in the dead tissue, it did not contain thorium. Uranium is soluble in water and easily enters the bone while the thorium adsorbs on the clay soil particles since it is insoluble in water. In this work, we determined the equations needed to calculate the age of a bone sample. We have shown that age cannot be determined from the activity ratio between uranium-234 and its source uranium-238 because ratio had to be 1 from 3.5 million years, before they both entered the bone. Thus, we used the activity ratio of thorium-230 and its source uranium-234 which allowed us to go backward up to 350 000 years. In the case where 234U/238U is greater than 1, an amount of exogenous 234U should be deducted.



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