C14 Natural abundance

["Edward L. Wilds, Jr." <wilds@safety.ehs.uconn.edu>]

Radsafers:
	Can someone complete the following table for the natural 
abundance of carbon isotopes in the environment and supply the 
reference.

	C12 - 98.89%
	C13 - 1.11%
	C14 - ?

I have seen a value for C14 of 0.0000000010%.  Is this familiar 
to anyone?  Thanks for the help.

Ed Wilds

+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*+*++*+*+*+*+*+*+*+
Edward L. Wilds, Jr., Ph.D.
The University of Connecticut
Department of Environmental Health & Safety
Radiation Safety Manager
233 Glenbrook Rd., U97
Storrs, CT  06269-4097
Ph. (860) 486-3613
Fax.(860) 486-1106
Email: Ehsadm3@uconnvm.uconn.edu
       Wilds@safety.ehs.uconn.edu