[ RadSafe ] Geology Type Question

[Jaro Franta]

If that's the case, then how do vein-type ore deposits of Uranium form ?

Video:
https://youtu.be/DBXrr7N9kKs

Is the understanding presented in the video wrong ?  (maybe outdated ?)

Thnx

Jaro 
^^^^^^^^^^^^^^^^^^^^^^^^^^^



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of KARAM, PHILIP
Sent: Tuesday, November 22, 2016 11:00 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Geology Type Question

You see something similar in the high-background area in Ramsar Iran. 
Groundwater circulates between the surface and subsurface, where the
radioactivity is. 
By the time it gets to depth it's lost pretty much all of its oxygen, so it
can't dissolve out the uranium. 
But the radium will go into solution, and it's brought to the surface with
the rest of the mineral-laden water. 
Once there, the minerals precipitate out to form freshwater limestone
(travertine) with the radium substituting for calcium in the mineral
structure. 
Some rocks there are as much as 10-11 million pCi/gm and the soils derived
from these rocks are in the thousands of pCi/gm.

So - same geochemistry, just a different setting.

Andy

P. Andrew Karam, PhD, CHP
NYPD Counterterrorism Division
(718) 615-7055 (desk)
(646) 879-5268 (mobile)

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Dan McCarn
Sent: Tuesday, November 22, 2016 8:36 AM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Geology Type Question

Hi Mike:

Uranium has 2 common valence states in geologic media: +4 and +6; chemically
reduced (+4) and oxidized (+6) which have 8 (or so) orders of magnitude
differences in aqueous solubility. 
The reduced phase - commonly uraninite (UO2) - has far less aqueous
solubility than the oxidized phase. 
Oil & gas deposits are, by definition, methanogenic and strongly reducing,
thus little or no soluble uranium is present in connate waters. 

Thorium has very little aqueous solubility. 

So what ends-up on pipes as NORM are the decay products. 


Dan W McCarn
108 Sherwood Blvd
Los Alamos, NM 87544 USA
+1-505-670-8123
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