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Re: 90-Y counting in Beta/Gamma Counters
I am a bit late in responding due to vacation...
Aren't there a number of multi-ring compounds in serum that could act as
fluors and wave-length shifters to increase the apparent counting
efficiency? (Just a guess...)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - H. Gregg Claycamp, Ph.D., C.H.P.
H. Gregg Claycamp, Ph.D., C.H.P.
Assoc. Prof. and Assoc. Chair
Dept. of Environmental and Occupational Health
University of Pittsburgh
412-967-6524 FAX: 412-624-1020
On Wed, 12 Aug 1998, CMMI012 RSO wrote:
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> Hello All,
> I am looking for some help regarding counting samples of 90-Y in a =
> beta counter and gamma Counter. We counted 3 samples of 90-Y of similar =
> activity in a beta counter and gamma counter in similar geoemtry/vials. =
> One sample contained 90-Y in saline, the other 2 contained 90-Y in serum =
> (at different concentrations). The numbers looked reasonable from the =
> beta counter. However, when the samples were counted in a gamma counter, =
> the serum sample yielded higher counts than the saline sample. the =
> experiment was repeated several times with similar results. Does anyone =
> have an expalantion as to why the serum samples would yield hugher =
> counts in the gamma counter as opposed to the saline sample? Any help is =
> greatly appreciated. Thanks in advance.
> Truly yours,
> Bob Dunn
> rso.gscancer@worldnet.att.net
>
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> <DIV><FONT color=3D#000000 size=3D2>Hello All,</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2> I am looking for =
> some help=20
> regarding counting samples of 90-Y in a beta counter and gamma Counter. =
> We=20
> counted 3 samples of 90-Y of similar activity in a beta counter and =
> gamma=20
> counter in similar geoemtry/vials. One sample contained 90-Y in saline, =
> the=20
> other 2 contained 90-Y in serum (at different concentrations). The =
> numbers=20
> looked reasonable from the beta counter. However, when the samples were =
> counted=20
> in a gamma counter, the serum sample yielded higher counts than the =
> saline=20
> sample. the experiment was repeated several times with similar results. =
> Does=20
> anyone have an expalantion as to why the serum samples would yield =
> hugher counts=20
> in the gamma counter as opposed to the saline sample? Any help is =
> greatly=20
> appreciated. Thanks in advance.</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>Truly yours,</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>Bob Dunn</FONT></DIV>
> <DIV><FONT color=3D#000000=20
> size=3D2>rso.gscancer@worldnet.att.net</FONT></DIV></BODY></HTML>
>
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