Actinides migration

Kim, J. I., Buckau, G., Baumgartner, F., Moon, H. C. Lux, D. 1984. Colloid generation and the actinide migration in Gorleben ground-waters. In. McVay, G. L. (ed) Scientific Basis for Nuclear Waste Management VII. North-Holland, New York, 31-40. 

The actinide retardation data for the hydrothermally-altered repository component experiments (4 and 5) in Table VI are preliminary and their interpretation is hindered by the lack of attainment of a steady-state condition for actinide migration in the systems These data indicate that only a small fraction of the actinides are retained by the rock core Comparing these results to those of the unaltered fissure experiments, where Pu and Np were almost completely retarded by the rock core, one could conclude that altering the rock tends to lower its ability to retard actinide migration Another way to discuss these same data, and one that leads to a completely opposite conclusion, is in terms of the amount of activity retained by the rock core, or, the rate of actinide loss from the groundwater in terms of A (dpm/mL) of 2 Pu and 237Np ... 

There was no perceptible difference in groundwater/ basalt interactions or actinide migration due to laboratory analog apparatus construction materials (Hastelloy vs. Monel). 

Gillow J. B., Dunn M., Francis A. L, Lucero D. A., and Papenguth H. W. (2000) The potential for subterranean microbes in facilitating actinide migration at the Grimsel Test Site and Waste Isolation Pilot Plant. Radiochim. Acta 88(9-11), 769-774. 

Honeyman, B.D., R.A. Hamish, T. McKibben, J.R. Spear, and S. Winkler. 1999. Actinide migration studies at the Rocky Rats Environmental Technology Site The effect of soil-water redox potential on 239,240py solubility. Report to Kaiser-Hill, Rocky Flats Environ. Technol. Site. 

I. Engkvist and Y. Albiusson, Eourth International Conference on the Chemistry and Migration Pehavior of Actinides andFission Products in the Geosphere R. 

Adloff JP, Roessler K (1991) Recoil and transmutation effects in the migration behavior of actinides. Radiochim Acta 52/53 269-274... 

As already noted, the carbonylation of bis(pentamethyl-cyclopentadienyl) actinide hydrocarbyls is irreversible in the cases studied thus far. Thus, thermolysis does not result in CO loss, but rather in interesting chemical reactions. Thermolysis of 1 ( 5) in toluene solution results in hydrogen atom migration to yield an enolate (eq.(5)). NMR studies establish that eq.(5) is essentially quantitative, and that the stereochemical course... 

Deep geological disposal is the most favored solution for the permanent disposal of nuclear wastes with long half-lives. Although the locations of the burial places are selected with outmost care to avoid migration of the wastes in nature over a very long period of time, no barrier can be safe forever, so, numerous studies are in progress to determine the main factors that could cause leaks of radioactive nuclides. Soluble compounds in ground water are likely to play a major role in the release of actinides. 

Torstenfelt B. 1986. Migration of the actinides, thorium, protactinium, uranium, neptunium, plutonium and americium in clay. Radiochem Acta 39 105-112. 

Miller, B., Alexander, R., Chapman, N. A., McKinley, I. G. Smellie J. A. T. 1994. Natural analogues revisited. Fourth International Conference on the Chemistry and Migration Behavior of Actinides and Fission Products in the Geosphere, Charleston, 545-549. 

Eberly, P., Ewing, R. C., Janeczek, J. Furlano, A. 1996. Clays at the natural nuclear reactor at Bangombe, Gabon Migration of actinides. Radiochimica Acta, 74, 271-275. 

The potentially important role of colloidal species in the geochemical behaviour of the polyvalent actinides has nevertheless been stated by various authors (e.g., Kim 1991 Kersting et al. 1999). The present paper discusses the role of colloids on the release of radionuclides from a nuclear waste repositoiy with regard to the processes leading to (1) colloid generation and stability (2) radionuclide interaction with aquatic colloids and (3) colloid-borne radionuclide migration. 

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