Abstract
The use of calcium phosphate hydraulic cements for conditioning radioactive elements, such as Sr90, seems very interesting. The strontium was incorporated in various amounts in the liquid phase (0-10% weight). After hardening, the cement is formed by a poorly crystallized strontium calcium apatite. The incorporation of Sr in the apatitic lattice was evidenced by the correlation between the amount of Sr and the crystalline state, the (002) diffraction line shift and the thermal decomposition. This thermal decomposition (> 600°C) leads to stoichiometric and stable apatites. Mechanical properties increases with Sr % weight.
