Re: Critics Allege Infant Mortality Rate

[Norman & Karen Cohen <norco@bellatlantic.net>]

Hi Bob,

The info for the technique might be on the webpage: www.radiation.org
I don't recall exactly, it was something like a spellation counter, but that
might not be the correct name for the machine.


norm

Bob Flood wrote:

> >   Maybe I missed something earlier, but where would the mis-identification
> >of K-40 with Sr-90 occur. I was under the impression that the K-40 has
> >a very active gamma (about 1460 KeV) however, the Sr-90 is no where close.
> >Even if you were to measure the Y-90 counterpart the energies are so far
> >off, I don't know that you could really confuse the two? If Im off base
> here let me know.
>
> I may have made an assumption that might not be valid - I would expect that
> Sr-90 would be evaluated using a beta analysis, since gamma would be
> impractical (a chemical extraction would alter the Sr/Y relationship, and
> the Y-90 photons are too few to rely on, anyway). I would also expect a
> budget-constrained study that is looking for Sr-90 to use a gross beta
> counting method and make an adjustment for K-40, which I assume could be
> done from gamma spec results of the same sample.
> ============================
> Bob Flood
> Dosimetry Group Leader
> Stanford Linear Accelerator Center
> bflood@slac.stanford.edu
>
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