Fwd: Pd-103 activity verification

[Ccja@aol.com]

---------------------
Forwarded message:
From:	pking@CYBERTRON.COM (P. King)
Sender:	medphys@LISTS.WAYNE.EDU (Medical Physics Listserver)
Reply-to:	MEDPHYS@LISTS.WAYNE.EDU (Medical Physics Mailing List)
To:	MEDPHYS@LISTS.WAYNE.EDU (Multiple recipients of list MEDPHYS)
Date: 97-10-31 05:13:43 EST

I do check the activity of Pd-103 seeds. In the absence of an NBS tracable
standard, all
you can really do is demonstrate reproducibility (which is, of course, the
most
important thing).  I've not had great results and am flagging just as hard as
I can.  As
far as how:  Standard imaging HDR well chamber, I-125 ADCL factor, with
Standard Imaging
provided energy dependence factor.  This last part is where the
smoke-and-mirrors comes
in, and makes this a constancy-only check.  If you think that Theragenics is
not getting
this right and you can resolve, please contact Ty Robin at Theragenics.
- Paul

CBS970@AOL.COM wrote:
>
>    I am not working with Pd-103, but am curious how those who do verify the
> activity of the seeds?  Do you have a NIST-traceable calibration
independent
> of Theragenics?  I got the sinking feeling from a post or two that
> Theragenics calibrated at least one of its chambers with a cadmium check
> source, the same type of error I posted earlier about my trip to 3M to
> resolve their I-125 miscalibrations.  I have this feeling that perhaps none
> of Theragenics Pd-103 calibrations have been accurate and no one has
flagged
> it until now.  If you have a check system, how was the Pd-103 calibration
> factor assigned to it?  Thanks.
>                         -  Carter Schroy
>
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