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Re: Distillation of urine

Paul,

    I looked in HPS N13.14-1994 Internal Dosimetry Programs for Tritium
Exposure-under their Counting Protocol on page 21 they state " A typical
counting protocol would use a commercial LS cocktail, 22 mL plastic vials,
and a sample composition of 0.5 mL urine thoroughly mixed with 10 mL of the
LS cocktail.  Counting efficiency for this composition will vary from 45 to
25% depending on the quenching.

Hope this is of some help.

Steve Hand
University of Maryland
Radiation Safety
hand@wam.umd.edu

Paul Lavely wrote:

> --============_-1236038738==_ma============
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> We have been performing analysis of some human urine samples for
> levels of tritium that are at the lower end of our LSC to measure. We
> have been distilling the urine to rid it of the color and chemicals
> other than water. This distillation process is more than a burden.
> Does anyone use a process that would eliminate the distillation
> process?
>
> Thanks,
>
> Paul Lavely
> UC Berkeley
> lavelyp@uclink4.berkeley.edu
> --============_-1236038738==_ma============
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> <html><head><style type="text/css"><!--
> blockquote, dl, ul, ol, li { margin-top: 0 ; margin-bottom: 0 }
>  --></style><title>Distillation of urine</title></head><body>
> <div><font face="Palatino" size="+2" color="#000000">We have been
> performing analysis of some human urine samples for levels of tritium
> that are at the lower end of our LSC to measure. We have been
> distilling the urine to rid it of the color and chemicals other than
> water. This distillation process is more than a burden. Does anyone
> use a process that would eliminate the distillation process?<br>
> <br>
> Thanks,<br>
> <br>
> Paul Lavely<br>
> UC Berkeley<br>
> lavelyp@uclink4.berkeley.edu</font></div>
> </body>
> </html>
> --============_-1236038738==_ma============--
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