[ RadSafe ] Feild instruments for low activity gamma in soil

Joseph Shonka jjshonka at shonka.com
Tue Jul 8 13:02:54 CDT 2014

Dear Andy:

I was responsible for the instrumentation used for cleanup of the Kaiser
Aluminum SDMP site in Tulsa, OK.  The NRC was the authority, however, EPA
and the State concurred.  We used NaI operated as spectrometers.  The
detector size was chosen based on the scanning speed.

Joe Shonka
Joseph J. Shonka, Ph.D.
Shonka Research Associates, Inc.
119 Ridgemore Circle
Toccoa, GA 30577

On Tue, Jul 8, 2014 at 1:55 PM, Owen, Austin Andrew <owenaa at oro.doe.gov>

> Hello,
> Does anyone know of a field instrument capable of detection of 7 pCi/gm
> gamma in soils for Thorium remediation.  To be used in Northern Illinois
> with a higher than average Rn background?
> If so, has DOE or EPA approved use of instrument to meet free release
> criteria and/or screening for lab analysis.
> I would also be interested in any previous technical papers used to
> justify use of instrument or combination of scanner and scalar.
> Thanks
> Andy Owen
> Health Physicist
> Engineering and ISC Services Division
> (865) 576-0852
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