Gamma radiation effect on a murataite ceramic doped with Sr and Cs
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This study investigates the influence of gamma radiation, emitted by a Cobalt-60 source, on the structural modifications of apolysomatic ceramic of the Murataite type, intended for the containment of radioactive waste. The matrix is doped with Srand Cs to simulate both radioactive alkaline and alkaline-earth isotopes. Samples are irradiated with a total dose of 105 Gy. After irradiation, the Archimedes density increases by 9.80% and 10.61% for undoped and Sr-doped ceramics, respectively. However, it decreases by 3.05% and 3.65% for Cs-doped ceramics and Sr-Cs co-doped ceramics, respectively. All measuredvalues are below 4 g/cm3. For all materials, the main XRD identified phase is 5M Murataite. After irradiation, this phasedecreases significantly for both Cs and (Sr,Cs) doped materials, revealing that the particles movements under irradiationfavours Cs and Sr-Cs hosting in the Zincohoegbomite secondary formed phase, which growth significantly after irradiation. The SEM observations reveal the crystalline grains morphological features, with few micrometers’ sizes. The ceramics’Vickers microhardness is not affected and ranges between 410 and 646 HV. In conclusion, both the reference materialand Sr-Mur material composition are the optimum chemical composition and give the optimum murataites’phase content after irradiation.
Abstract
This study investigates the influence of gamma radiation, emitted by a Cobalt-60 source, on the structural modifications of apolysomatic ceramic of the Murataite type, intended for the containment of radioactive waste. The matrix is doped with Srand Cs to simulate both radioactive alkaline and alkaline-earth isotopes. Samples are irradiated with a total dose of 105 Gy. After irradiation, the Archimedes density increases by 9.80% and 10.61% for undoped and Sr-doped ceramics, respectively. However, it decreases by 3.05% and 3.65% for Cs-doped ceramics and Sr-Cs co-doped ceramics, respectively. All measuredvalues are below 4 g/cm3. For all materials, the main XRD identified phase is 5M Murataite. After irradiation, this phasedecreases significantly for both Cs and (Sr,Cs) doped materials, revealing that the particles movements under irradiationfavours Cs and Sr-Cs hosting in the Zincohoegbomite secondary formed phase, which growth significantly after irradiation. The SEM observations reveal the crystalline grains morphological features, with few micrometers’ sizes. The ceramics’Vickers microhardness is not affected and ranges between 410 and 646 HV. In conclusion, both the reference materialand Sr-Mur material composition are the optimum chemical composition and give the optimum murataites’phase content after irradiation.
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