Re: uranium in drinking water

["Tom Savin" <lexicon@hotbot.com>]

 Quick question, would you then expect to preferentially get higher amounts of U-234 than U-238 when in-situ leaching mining? - Tom
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On Tue, 10 Oct 2000 15:19:27   Bob Shannon wrote:
>----- Original Message -----
>From: "Franz Schoenhofer" <franz.schoenhofer@chello.at>
>To: "Multiple recipients of list" <radsafe@romulus.ehs.uiuc.edu>
>Sent: Tuesday, October 10, 2000 1:32 PM
>Subject: Re: uranium in drinking water
>
>>
>> I recall, that U-238 and U-234 activity concentrations are usually equal.
>I
>> can hardly imagine any process that would disturb equilibrium when
>leaching
>> the isotopes from the ground rock or soil.
>>
>
>U-238/U-234 disequilibrium is very commonly observed  in groundwaters. The
>phenomenon is reportedly responsible for U-234:U-238 activity ratios as high
>as 10:1.  The mechanism that I have heard proposed for this is that U-234 is
>relatively more soluble than U-238 in certain geological materials due to
>recoil damage to the crystal caused during in situ decay of U-238 to U-234.
>
>
>Bob Shannon
>Radiochemistry Technical Director
>Paragon Analytics, Inc.
>Tel: 970-490-1511
>
>
>
>
>
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