[en] The hydrofracture process is currently being used at Oak Ridge National Laboratory (ORNL) for the permanent disposal of locally generated radioactive waste solutions. In this process, the waste solution is mixed with a blend of cement and other solid additives; the resulting grout is then injected into an impermeable shale formation at a depth of 200 to 300 m (700 to 1000 ft). The grout sets a few hours after completion of the injection, fixing the radioactive waste in the shale formation. Between 1966 and 1979, ORNL has used hydrofracture to dispose of more than 8 million L (2 million gal) of waste grout containing more than 600,000 Ci of radionuclide activity. Calculations show that operational costs are on the order of $0.16/L ($0.60/gal). Construction of a new hydrofracture disposal facility has been completed, and operational injections were initiated in June 1982

[en] This annotated bibliography lists published work on electron transfer in heavy particle collisions for the period 1950 to 1975. Sources include scientific journals, abstract compilations, conference proceedings, books, and reports. The bibliography is arranged alphabetically by author. Each entry indicates whether the work was experimental or theoretical, what energy range was covered, and what reactants were investigated. Following the bibliographical listing are indexes of reactants and authors

[en] Despite the demonstrated importance of diffusion control in leaching, other mechanisms have been observed to play a role. Thus, leaching from porous solid bodies is not simple diffusion. However, only the theory of simple diffusion has been developed well enough for extrapolation. This diffusion theory, used in data analysis by ANSI/ANS-16.1 and the NEWBOX program, can help in trying to extrapolate and predict the performance of solidified waste forms over decades and centuries, but the limitations and increased uncertainty of such applications must be understood. Treating leaching as a semi-infinite medium problem, as done in the Cote model, results in simpler equations but limits application to early leaching behavior (when less than 20% of a given component has been leached)

[en] Thin films of α-Fe₂O₃(0001) (hematite) and γ-Fe₂O₃ (001) (maghemite) were epitaxially grown on Al₂O₃(0001) and MgO(001) substrates, respectively, using the new molecular beam epitaxy (MBE) system at the Environmental Molecular Sciences Laboratory (EMSL). We have investigated the crystalline quality of these films using Rutherford Backscattering (RBS) and channeling experiments. Minimum yields obtained from aligned and random spectra are 2.7±0.3% for the α-Fe₂O₃(0001) film and 14.5±0.6% for the γ-Fe₂O₃ (001) film. Al and Mg outdiffusion into the hematite and maghemite films were observed at higher temperatures. Indiffusion of Fe atoms from the film into the substrate was observed for the γ-Fe₂O₃(001)/MgO(001) system. In contrast, no Fe indiffusion was observed for the sapphire substrate