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Re: U-235 in Natural Uranium
Philippe and Leo
I agree if you are only considering the ratio of 235/238, but not 234/238.
The ratio of 234/238 in ground water can be greater than unity because the
solubility of the micro-matrix that contains uranium can change when 238
decays. Bob Brown had an AECL report on this, but I don't know if he
published it.
John R Johnson
----- Original Message -----
From: Philippe Duport <pduport@uottawa.ca>
To: Leo M. Lowe - SENES Consultants Limited <llowe@senes.on.ca>;
<radsafe@list.vanderbilt.edu>
Sent: Tuesday, June 12, 2001 11:25 AM
Subject: Re: U-235 in Natural Uranium
> Leo,
>
> I do not remember having seen data on the variability of the U235/238
ratio
> in U ores. One would think that the U235/238 ratio is quite constant and
> stable everywhere in the Earth crust, except where nuclear reactions
> occurred naturally. There are no reports of other Oklas. There are no
> mechanisms other than nuclear reactions and isotopic separation to change
> the isotope ratio in natural elements. Then, except at fossil reactors,
the
> U235/238 ratio should be constant everywhere, as are the C14/C14 and
> K39-K41/K40 ratios.
>
> In particular, the C14/C12 ratio is considered constant enough to be used
> for accurately dating prehistoric artifacts.
>
> Philippe Duport
>
> ----- Original Message -----
> From: "Leo M. Lowe - SENES Consultants Limited" <llowe@senes.on.ca>
> To: <radsafe@list.vanderbilt.edu>
> Sent: Tuesday, June 12, 2001 9:18 AM
> Subject: U-235 in Natural Uranium
>
>
> > Hello All:
> >
> > Does anyone have any literature/information on the normal variability of
> > the U-235 concentration in naturally occurring uranium in ores and soils
> > i.e. 0.72% +/- ??. I understand that the NRC considers depleted uranium
> > (DU) as uranium depleted below 0.711% U-235. Does this then mean that
> > natural uranium does not exhibit U-235 levels this low (except in unique
> > circumstances such as the Okla natural reactor)?
> >
> > Thank you.
> >
> > Leo M. Lowe, Ph.D.
> > Principal, Senior Health and
> > Environmental Physicist
> >
> > SENES Consultants Limited
> > 121 Granton Drive, Unit 12
> > Richmond Hill, Ontario
> > Canada L4B 3N4
> > Tel: (905) 764-9380
> > Fax: (905) 764-9386
> > e-mail: llowe@senes.on.ca
> > WWW: www.senes.on.ca
> >
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