Re[4]: Counting Statistics

["Jim Dunlap" <jim.dunlap@guardian.brooks.af.mil>]

     I didn't experience that at all.  Perhaps you used a grade of HCl that 
     caused this.  Clearly, if you eluted with aa chelating agent you're 
     going to experience problems.  I eluted with the hightes quality HCl 
     (1 N, I think).  I added the EDTA after eluting.  Bottom line for me 
     was: I DIDN'T EXPERIENCE PROBLEMS.


______________________________ Reply Separator _________________________________
Subject: Re: Re[2]: Counting Statistics
Author:  radsafe@romulus.ehs.uiuc.edu at guardian
Date:    1/15/99 2:07 PM



>     Within 10 hours, it's gone (for practical purposes), and the Ge-68 
>     parent breakthrough has not been shown to be a problem.  

My experience with the Ge-68/Ga-68 generator is limited to PET QC with
Dupont generators and is a few years old. Both the EDTA and HCl based
elutions systems showed rather significant and persistent Ge-68
breakthrough. The resulting contamination was very difficult to remove from
sinks, pipes and traps. With a ~270 day T1/2, for the Ge-68, this of course,
can be a problem. 

Hopefully, the more current generator technology does not have a
breakthrough problem.
Daniel F. Kane
Medical Nuclear Physicist
Associates in Medical Physics, LLC

dankane@mindspring.com
www.medphysics.com
(770) 980 - 0714
FAX (770) 980 - 1278

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