RE: U-235 in Natural Uranium

["Stokes, James" <StokesJ@TTNUS.COM>]

NAtural Uranium is considered .711%, DOE isgiving you the standard deviation

in the numbers they provided.

-----Original Message-----

From: BLReider@AOL.COM

To: radsafe@list.vanderbilt.edu

Sent: 6/18/01 7:09 PM

Subject: Re: U-235 in Natural Uranium



DOE STD 1136-2000 Table 2-1 gives U-235 weight % as 0.72%, and states

that the range of the weight % of U-235 in the natural environment can

vary from 0.61% to 0.81%.  Std. dev. is not given.



Barbara Reider, CHP





>>>Hello All:



Does anyone have any literature/information on the normal variability of



the U-235 concentration in naturally occurring uranium in ores and soils



i.e. 0.72% +/- ??.  I understand that the NRC considers depleted uranium



(DU) as uranium depleted below 0.711% U-235.  Does this then mean that 

natural uranium does not exhibit U-235 levels this low (except in unique



circumstances such as the Okla natural reactor)?



Thank you.



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