Conditions for synthesis and immobilizing features of brabantite CaTh(PO4)2 and solid solutions on its base are studied. The sol-gel method is used for synthesis of ceramics, which allows us to carry out the joint sedimentation of matrix components and elements-impurities (Si and La in a sum up to 40 wt % by oxides). It is shown that, in the brabantite crystal lattice, calcium and thorium are isomorphously substituted by strontium and lanthanum. Radiation-damage and chemical stabilities of the obtained samples are studied. It is established that, by immobilizing properties (isomorphous capacity, chemical and radiation-damage stabilities), brabantite-based ceramics is not inferior to other phosphate matrices as well as the matrices based on zircon and zirconolite, which can be used as the preserving matrices of high-and middle-level waste.

• Шабалін Борис Григорович (національна безпека)

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