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Paul Charp
wrote:
>Subject: uranium in drinking
water
>Message-ID:
<F0DEEE37B071D211AB210001FA12DAAF0245A580@mcdc-atl-50.cdc.gov>
>We
have been involved with this situation for about a week. The
uranium
>data we have received thusfar is that the
uranium analysis was performed by
>gamma spec with the following results listed
as pCi/L:
>U-nat 758 +/- 140 mda
0.8
>U
235 7 +/- 2 mda 0.5
>U
234 512 +/- 95 mda 0.8
>U
238 224 +/- 42 mda 0.7
>the
total alpha was measured at 882 pCi/L with no indication of the
method
>used for this
analysis I would question the
method and accuracy of these "results". I doubt it is physically possible for a
gamma spectroscopy system (HPGe) to count a water sample large enough and/or
long enough to measure to these reported mda's. The other thing that jumps
out from this data is what gamma is being measured to determine U-234, a pure
alpha emitter and no daughter in quick equilibrium?
I would want to see
some alpha spectroscopy results to be confident in this
data.
Erik C. Nielsen
Radiochemist
Antech Ltd.
c/o Westinghouse Waltz Mill Site
P.O. Box 158 (Bldg. G, M/S 62)
Madison, PA 15663
voice 724-722-5214
fax 724-722-5208
mailto: enielsen@antechltd.net
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