Dose from U-235 daughters

[David.Cowell@wssrap.com (David Cowell)]

     Dear Radsafers - 
     
     Pa-231 and Ac-227 are two of the U-235 daughters which have high dose 
     conversion factors (mrem/uCi).  They could be in the raffinate pits on 
     our site at concentrations high enough to be a dose concern, but we 
     have little info on this.  We are wondering if other sites similar to 
     ours are accounting for these in their dose assessments, if they've 
     even analyzed for these nuclides, and if they have, what analytical 
     methods were used.  A few years ago we tried to get labs to analyze 
     for these and were told at that time there no standard analytical 
     methods for them.
     
     Please feel free to respond to me personally or to radsafe.
     
     Thanks,
     David Cowell
     
     e-mail:  David.Cowell@WSSRAP.com