U-235 Abundance in Natural Urnaium

["Leo M. Lowe" <llowe@senes.ca>]

Hello,



An international standard reference on the isotopic composition of uranium 

and all other elements   "Isotopic Abundances of the Elements 1997"  is 

published by the International Union of Pure and Applied Chemistry and may 

be found at :



http://www.iupac.org/reports/1998/7001rosman/index.html



The range (atom%) of natural variation in U-235 is given as 0.7202 - 

0.7198, and the reference given is:



  G.A. Cowan and H.H. Adler 1976.  "The Variability of the Natural 

Abundance of U-235".  Geochim. Cossmochim. Acta 40: 1487-1490.



Note that these refer to atomic abundances.



Regards,

Leo M. Lowe, Ph.D.



SENES Consultants Limited

llowe@senes.ca

www.senes.ca

Tel: (905) 764-9380

Fax:(905) 764-9386



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