[ RadSafe ] Concerning Rizzini's claim of one ug U-238

Dan McCarn hotgreenchile at gmail.com
Mon Oct 28 03:09:04 CDT 2013

Dear Otto:

Most natural oxidizing waters contain about 1 ug/L U or more. I've measured
concentrations in the 100s of ug/L U in natural environments. Large
portions of my project areas (geological exploration) contain 5-10 ug/L U
as normal background in aquifers.  Reducing waters are typically
undetectable <0.1 ug/L U.

In one project area, the San Luis Valley, Southern Colorado, I plotted eH &
pH values across a regional redox-controlled roll-front.  See:

McCarn, Dan W. (2004): Scoping Calculations: Natural and anthropogenic
multi-pathway risks associated with naturally occurring uranium
mineralization in aquifers;
*, pp.289-315.


Fig. 3, Page 295 is an Eh / pH diagram showing stability fields for the
mineral uraninite (UO2) and 3 aqueous carbonate species of uranium.
Clearly, he is mistaken!

Dan ii

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 Mon, Oct 28, 2013 at 1:14 AM, Otto G. Raabe <ograabe at ucdavis.edu> wrote:

> Rizzini has been quoted as saying that one microgram of U-238 can kill a
> person. An article from March 31, 2011, Rizzini once again claims that 1
> microgram of uranium is enough to kill a person:
> PLEASE CHECK MY MATH: According to ICRP-2 (page 81) a human can have a
> body burden of U-238 of 0.5 microcuries without lifetime risk.
> That is 0.5 microcuries times 3.7 x 109 Bq/uCi = 1.9 x 109 Bq. One
> microgram of U-238 equals 0.012 Bq.
> Hence, according to ICRP-2 a human could have an internal burden of about
> ten grams without significant radiation risk.
> Am I missing something here? Please check my math.
> Otto
> ************************************************
> Prof. Otto G. Raabe, Ph.D., CHP
> Center for Health & the Environment
> University of California
> One Shields Avenue
> Davis, CA 95616
> E-Mail: ograabe at ucdavis.edu
> Phone: (530) 752-7754   FAX: (530) 758-6140
> *************************************************
> ______________________________**_________________
> You are currently subscribed to the RadSafe mailing list
> Before posting a message to RadSafe be sure to have read and understood
> the RadSafe rules. These can be found at: http://health.phys.iit.edu/**
> radsaferules.html <http://health.phys.iit.edu/radsaferules.html>
> For information on how to subscribe or unsubscribe and other settings
> visit: http://health.phys.iit.edu

More information about the RadSafe mailing list