2006
DOI: 10.1007/s10582-006-1002-9
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Geochemical study of uranium mobility in tertiary argillaceous system at ruprechtov site, Czech Republic

Abstract: The natural analogue study at the Ruprechtov site is aimed to investigate and understand the behaviour of natural radioelements in plastic clay formation. Uranium is present predominantly in U(+IV) form, either in secondary uranium minerals (uraninite, ningyoite) or in detrital immobile phases (monazite, rhabdophane, xenotime, zircon) and in hardly characterisable non-crystalline forms as well. Process of uranium accumulation probably proceeded via reduction of U(VI) and U(IV) precipitation with involvement of… Show more

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Cited by 4 publications
(2 citation statements)
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“…For uranium, uraninite (UO 2 ) was assumed to be the solubility-controlling phase because of its presence in the waste form. This treatment is consistent with a natural analogue study of uranium fixation in a Tertiary argillite (Havlova et al 2006). …”
Section: Radionuclide Solubilitysupporting
confidence: 87%
“…For uranium, uraninite (UO 2 ) was assumed to be the solubility-controlling phase because of its presence in the waste form. This treatment is consistent with a natural analogue study of uranium fixation in a Tertiary argillite (Havlova et al 2006). …”
Section: Radionuclide Solubilitysupporting
confidence: 87%
“…Because uraninite is the stable uranium phase, negligible oxidative degradation of the waste form would be expected. For example, a natural analogue study of uranium fixation in a Tertiary argillite found that uraninite was the principal secondary uranium phase formed (with less abundant U-phosphate and U-phosphosulfate phases; Havlova et al 2006). When contacted by water, fuel rods would have diminished thermodynamic drive to dissolve, thus slowing the matrix release of actinides and fission products.…”
Section: Dissolved Radionuclide Solubility Controlsmentioning
confidence: 99%