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By Arnold M. Friedman (Eds.)

content material: The function of actinide habit in waste administration / John W. Bartlett --
Moisture and solute delivery 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 atmosphere / Roger C. Dahlman, Ernest A. Bondietti, and L. Dean Eyman --
program of the field version conception to the geophysical delivery of PuO₂ : geochemistry of Pu(NO₃)₄ / A.T. Jakubick --
Oklo, an scan in long term geologic garage / E.A. Bryant, G.A. Cowan, W.R. Daniels, and W.J. Maeck.

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Tablets of basalt were cut with smooth surfaces. Five of the six surfaces of the tablet were rendered impervious to water by coating them with wax. The sixth surface was l e f t untreated and was held in the apparatus in such a man­ ner as to be exposed to and wetted by a solution containing plutonium. 01 cm) as shown in Fig. 12. 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.

18). Distribution coefficients for sandy subsoils were generally one or less than one, indicating a large fraction of the Np remained in solution. The K. reported in Table II for Np(V) was 320 for the s o i l clay. Since the clay fraction of s o i l s i s generally the most reactive f r a c t i o n , the conclusion from these results i s that Np(V) should be the most mobile actinide element in the environment. Such mobility has important implications for long-term management of waste because of possible placement of wastes in geologic media that may not possess sorption characteristics as effective as surface s o i l s .

Compared with present-day levels of Pu entering t e r r e s t r i a l , freshwa­ ter, and marine ecosystems from global f a l l o u t , only small additional quantities of actinide elements w i l l be released from fuel cycles to the environment. Based on current fuel cycle concepts, operations involving fuel reprocessing and fabrication w i l l be the principal contributors of actinide elements to the environment. 4 mCi of man-made actinides would be released routinely for each 1000-MW(e) year of operation (2j.

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