Actinides in the Environment by Arnold M. Friedman (Eds.)

By Arnold M. Friedman (Eds.)

content material: The position of actinide habit in waste administration / John W. Bartlett --
Moisture and solute shipping in porous media / Merlin L. Wheeler --
The migration of plutonium and americium within the lithosphere / S. Fried, A.M. Friedman, J.J. Hines, R.W. Atcher, L.A. Quarterman, and A. Volesky --
organic pathways and chemical habit of plutonium and different actinides within the surroundings / Roger C. Dahlman, Ernest A. Bondietti, and L. Dean Eyman --
program of the field version concept to the geophysical shipping of PuO₂ : geochemistry of Pu(NO₃)₄ / A.T. Jakubick --
Oklo, an test in long term geologic garage / E.A. Bryant, G.A. Cowan, W.R. Daniels, and W.J. Maeck.

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Some small fraction of the Pu and Am migrates more rapidly (either v e r t i c a l l y or r a d i a l l y ) than the bulk of these species and appears to give an "exponential leading edge" in a plot of concentration of these species against d i s tance migrated. However, once fixed, even this fraction becomes much less mobile. This i s evidenced by the observations that: a. While rapid migration occurs upon addition of the original solution in the experiments, the a c t i v i t y distributions do not appear to change (or move) r a d i c a l l y after adding amounts of r a i n f a l l much larger than the original solution volumes (see Fig.

The space be­ tween the basalt and Teflon surfaces then constituted the fissure through which the aqueous medium could flow. Since a l l other surfaces of the basalt were waxed they did not participate in the experiment. Consequently a l l results on the distribution of plutonium on the surface of the basalt were unperturbed by effects that would have otherwise related to more complex geometries. 238 The plutonium, in this case the α - e m i t t i n g Pu, was intro­ duced at the top of the fissure in a very small volume (about 50 μ ΐ ) by means of an infusion pump.

Thus, in the event of a catastrophic intrusion of Pu into an aquifer (1n one of these media), the bulk of the Pu would not survive the migration to the external environment. 2. Some amount, less than 35% of the Pu in these experiments, appears to migrate at a rate of about ten times faster than the bulk of the Pu. The amount of the more rapidly migrating species appears to vary widely and i s undoubtedly affected by the chemical milieu and k i n e t i c s . The rapidly migrating species may be a polymeric form of Pu, either by i t s e l f or absorbed on fine mineral p a r t i c l e s .

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