Follow-up to Depleted Uranium

[Paul William Shafer <paulwilliam_s@YAHOO.COM>]

By the Radiological Health Handbook plus Knolls Lab

isotopic data, depleted uranium is by definition:

"uranium having an amount of U-235 less than 0.72 atom

percent abundance."



However, one respondant indicated that the NRC was

considering < 0.711 U-235 atom percent abundance as

depleted uranium.  From Auxier and Morgan (1975), "In

the case of natural uranium, which consists of

99.2830% U-238 +  0.0054% U-234 + 0.7114% U-235,

toxicity is also limiting."  Therefore, I suppose

<0.711 % would be not the "average" natural U and

would be considered depleted.



Paul W. Shafer

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