[ RadSafe ] Radioactivity and Fracking
JAitken at slb.com
Mon Jan 23 07:55:40 CST 2012
Dan: This material is manufactured ceramic "grains" originating in China, used as proppants in the Formation Fracturing (I hate the term "Fracking!) process.
I have actually forwarded the article to our Well Services business (who do Fracturing) to see if they ever had problems with these proppants.
QHSE Advisor, Schlumberger D&M Operations Support
Cell Phone: 713-562-8585
(alternate e-mail: doug.aitken at slb.com )
Mail: c/o Therese Wigzell,
Drilling & Measurements HQ,
300 Schlumberger Drive, MD15,
Sugar Land, Texas 77478
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Dan McCarn
Sent: Monday, January 23, 2012 12:06 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Radioactivity and Fracking
Since the material is most likely natural, I make the assumption that the radium is in secular equilibrium with uranium. In order to place these quantities in perspective, the equivalent amount of natural uranium was calculated in mg / kg (ppm). For the regulatory limit of 5 pCi/g Ra ==
0.185 Bq/g this would be the equivalent of 7.32 mg/kg U-Nat. This is slightly less than the typical granites in Wyoming which average about 10 mg/kg U-Nat.
For the sand that would correspond to 45 pCi/g == 1.665 Bq/g, it is equivalent to 66 mg/kg (ppm) U-Nat. (6.59 x 10^-5 g). This could be from a moderately enriched granite or perhaps a heavy-mineral enriched natural sand containing zircon. Pure zircon sands contain from 150 - 300 mg/kg U-Nat == 100 - 200 pCi/kg almost always in secular equilibrium with
The anatectic granites mined for uranium in the Namib Desert in SE Africa
(Namibia) are about 100-125 mg/kg (ppm) U-Nat.
The Chattanooga (USA), Pierre (USA) & Kolm (Sweden) shales are about 100 mg/kg (ppm) U-Nat.
These are only observations.
Dan W McCarn, Geologist
108 Sherwood Blvd
Los Alamos, NM 87544-3425
+1-505-672-2014 (Home - New Mexico)
+1-505-670-8123 (Mobile - New Mexico)
HotGreenChile at gmail.com (Private email) HotGreenChile at gmail dot com
On Sat, Jan 21, 2012 at 8:24 PM, Lawrence Jacobi < rjacobi at jacobiconsulting.net> wrote:
> There has been an interesting series of articles in the Williston
> North Dakota newspaper regarding radioactivity from oilfield
> operations. My impression is that the reporters have tried to write
> balanced articles, but the stories have been replete with mild
> hysteria and misinterpretation of the data.
> Here's the latest:
> Lawrence R. Jacobi, Jr., P.E., J.D.
> Jacobi Consulting
> 10807 Bonaparte Bend
> Austin, TX 78750-2801
> (512) 656-4765 cell
> (512) 335-4006 fax
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