1. Structural investigation of coprecipitation of technetium-99 with iron phases
- Author
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Eric Gautron, Massoud Fattahi, Bernd Grambow, Stéphane Jobic, A. Olicard, Philippe Deniard, I. Alliot Llorens, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), and Université de Nantes (UN)-Université de Nantes (UN)
- Subjects
XRD ,Coprecipitation ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Technetium ,01 natural sciences ,7. Clean energy ,Siderite ,chemistry.chemical_compound ,Technetium-99 ,Physical and Theoretical Chemistry ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Aqueous solution ,Precipitation (chemistry) ,Chemistry ,Radiochemistry ,Radioactive waste ,021001 nanoscience & nanotechnology ,Electron diffraction ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,TEM ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,0210 nano-technology - Abstract
Technetium is a long-lived product of nuclear fission which commonly exhibits two oxidation states (IV and VII). Siderite (FeCO3), suspected to be formed as a container corrosion product in geological radioactive waste repositories, may concentrate by coprecipitation more than 90% of technetium-99, present as Tc(IV) in surrounding aqueous fluids. X-ray diffraction and transmission electron microscopy measurements indicate that technetium can be incorporated within the siderite structure, even if we note that technetium-bearing green rust phase may also be observed. These results suggest that siderite might play a beneficial role in limiting Tc diffusion to the next environment of nuclear waste repositories.
- Published
- 2008
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