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The highest actinide concentrations are characteristic of ferrites, while the lowest are observed in silicon- and aluminum-containing garnets.

Based on data that has been collected it has been concluded that it is possible to use pyrochlore matrices to incorporate the actinide and actinide-zirconium-rare earth fractions of high-level radioactive wastes. A phase with a garnet structure represents a more universal matrix. This material may be used for immobilizing both actinide and actinide-zirconium-rare earth fractions and actinide wastes with a more complex composition containing high levels of corrosion products (Al, Ga, Fe, Cr, Ni, Mn, Co). A biphase garnet-spinel association is a promising matrix for such wastes. Research on the radiation resistance and chemical stability of samples of garnet matrices under the influence of heated waters is a top priority for further study.

ACKNOWLEDGMENTS

The author is grateful to A. G. Ptashkin (Radon Research and Production Association, Moscow) and M. I. Lapina, A. V. Mokhov, and A. V. Sivtsov (IGEM) for their help in synthesizing and studying samples. This research was carried out with the partial financial support of the U.S. Department of Energy (project RC0-20002-SC14).

NOTES

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