RE: Source for Uranium?

[John R Johnson <idias@interchange.ubc.ca>]

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Andy is correct. FYI, some information is given in Section 4 of NCRP Report

No. 94.



John

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

  From: owner-radsafe@list.vanderbilt.edu

[mailto:owner-radsafe@list.vanderbilt.edu]On Behalf Of A Karam

  Sent: November 30, 2004 11:27 AM

  To: amrso@MCW.EDU; radsafe@list.vanderbilt.edu

  Subject: RE: Source for Uranium?





  Ralph -



  First, I am not sure where you can get these sources.  However....



  Remember that U-234 may or may not be in secular equilibrium, depending on

weathering and exposure to groundwater.  It is not uncommon for U-234 to be

present in higher concentrations in water, and lower concentrations in

minerals or soil.  Alpha damage to the crystal structure increases the

chance that U-234 will dissolve out of a particular crystal, so U-234 enters

water (and leaves crystals) more readily than U-238.



  Andy



  P. Andrew Karam, Ph.D., CHP

  Research Assistant Professor

  Rochester Institute of Technology

  Department of Biological Sciences

  85 Lomb Memorial Drive

  Rochester, NY  14623

  +1 585-475-6432

  karam@mail.rit.edu



  A foolish consistency is the hobgoblin of little minds, adored by little

statesmen and philosophers and divines. -Ralph Waldo Emerson, writer and

philosopher (1803-1882)



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

    From: owner-amrso@mcw.edu [mailto:owner-amrso@mcw.edu] On Behalf Of

NORTH, Ralph

    Sent: Tuesday, November 30, 2004 2:17 PM

    To: radsafe@list.vanderbilt.edu; amrso@mcw.edu

    Subject: Source for Uranium?





    We are trying to track down highly enriched U-233 and U-236 to make a

"double-spike" for U isotope analyses as part of a project to date cave

deposits (1,000's to 100,000's of years old).  We need on the order of 10 mg

each, and the key is that they need to be very low in U-234, since we will

look at that isotope to establish attainment of secular equilibrium.

Normally Oakridge and New Brunswick have these, but both tell me none is

available at this time.







    Any leads on sources we might try? Thanks.







    Ralph North



    University of Wisconsin - Madison



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