Abstract
The results of manufacturing, studying the radiation and hydrolytic stability of a magnesium-potassium phosphate (MPP) matrix, are presented, which is being developed for the purpose of immobilizing 14C, a product of processing mixed uranium-plutonium nitride fuel. Samples of MPP matrix containing 20 and 40 wt % calcium carbonate as a waste form fixing 14C were irradiated with accelerated electrons with energies up to 2.5 MeV to doses of 106, 107 and 108 Gy. It was found that the destruction of the target phases begins at a dose of 107 Gy up to their complete decomposition after the accumulation of a dose of 108 Gy. A significant increase in the leaching rates for all studied cations from radiation-damaged samples after a dose accumulation of 108 Gy has not been established; the duration of the geological storage of the matrix until complete decomposition of the main 14C fixing phases has been estimated.
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