Re: Uranium Uptake Above 10 CFR 20 Limit

[William Lorenzen <LORENZEN_W@A1.TCH.Harvard.edu>]

          Don't Uranium intake levels BELOW the mass limit of 10 mg/wk also 
          need to be taken seriously too?  Doesn't it depends of the 
          solubility of the substance?
          
          The notice provided a derived uranium intake (29 mg).  The 
          derivation of that intake was, I assume, from applying some model 
          to urine data to back calculate that intake value.  Depending on 
          your assumptions about the solubility of the material you can get 
          a variety of answers.
          
          My comments had/have nothing to do with passing judgment on the 
          licensee (you went to far).  They were aimed at understanding why 
          ONLY a soluble limit applied (or was used for comparison) to a 
          relatively insoluble compound (U3O8).
          
          Is to possible to exceed a committed dose limit from a regulatory 
          standpoint for a class Y material before any nephrotoxic limit is 
          reached?  I agree urine can be an "INDICATOR" of an exposure, 
          however, a more detailed evaluation should be undertaken to 
          determine IF an exposure requires regulatory reporting.
          
          ANYONE:   What is the committed dose from an inhalation intake of 
          29 mg of class Y uranium (assume 1 micron particle size)
          
          Bill you have taken my comment(s) beyond my intended point of 
          discussion.
          
          I'll end my comments and contributions to this thread here.
          
          William A. Lorenzen
          

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