Re: U-235 in Natural Uranium

[BLReider@AOL.COM]

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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