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HVL for I-131


     Help, Radsafers!
        I'm looking for the HVL for I-131 in both lead and concrete.  So 
     far, I've found at least two different values for the lead HVL and 
     none for the concrete HVL.
        Does anyone have a reference?
        You may respond to me directly at plott@mc.duke.edu
     Thank you!
     Carmine