The present invention relates to the use of a mixed
carbonate of formula AB(CO3)2, in which A and B are different and chosen from alkali metals, alkaline-earth metals and rare earths, for the containment of radioactive carbon. This use may for example involve a process comprising: mixing C02 having a radioactive carbon to be contained, or a simple
carbonate of an alkali, alkaline-earth or rare-earth
metal having a radioactive carbon to be contained, with an
aqueous solution of a mixture of ACln and BClm or with an
aqueous solution of a mixture of A(OH)n and B(OH)m in order to obtain a precipitate of AB(CO3)2, where n and m are integers sufficient to compensate for the charge of A and B respectively;
recovery of the AB(CO3)2 precipitate in
powder form; and then pressing and
sintering of the
powder at a temperature below the decarbonation temperature of the mixed
carbonate manufactured in order to obtain sintered
pellets of mixed carbonates for the containment of the radioactive carbon.