[en] Zirconolite is a potential matrix for the immobilization of the minor actinides stream produced by the reprocessing of the spent fuel. In order to check the incorporation of actinide into the structure, zirconolite ceramic pellets doped with 10 wt% in ²³⁹PuO₂ were sintered. Characterization by SEM, XRD and XANES spectroscopy have been done on this material. The microstructural homogeneity of the pellets is good, and their relative density is higher than 90% of the theoretical density. XANES spectroscopy shows that Pu is at the oxidation state IV in this material. To investigate the effects of radiation damage on zirconolite structure, pellets doped with 10 wt% of ²³⁸PuO₂ were fabricated. The ²³⁸Pu accelerates the radiation damage relative to the ²³⁹Pu because of its much higher specific activity (63.2 x 10¹⁰ Bq/g for ²³⁸Pu vs. 2.2 x 10⁹ Bq/g for ²³⁸Pu). Some pellets are storing at ambient, 250 deg. C and 500 deg C. Up 10¹⁹ α/cm³, the macroscopic swelling of the samples stored at ambient is about 0.5% by 10¹⁸ α/cm³, and the microscopic one near 0.35% by 10¹⁸ α/cm³. Some microcracks are observed on these pellets. The samples started to become amorphous at 10¹⁹ α/cm³. The swelling strongly decreases with the storage temperature of the samples. The leaching rate of ²³⁹Pu doped ceramics measured by Soxhlet tests at 100 deg. C in deionized water appears to be the same as inactive material. (authors)