Radiolysis of confined water and self-radiolysis of tritiated water gives rise to several unanswered questions. To take into account this double specificity, we studied systems of zeolites 4A containing tritiated water at different water loading ratios. Two tritiated water were synthesized at the volumetric activities of 27 TBq.L-1 and 60 TBq.L-1. For each one, five samples were prepared, differentiated by their water loading ratios, expressed in percentage, close to 4, 7, 11, 14 and 19 %. The study of the radiolysis in those systems revealed a double role of zeolites 4A: first, they increase the decomposition of water. Then they enhance the recombination of the major stable radiolytic products detected. We actually evidenced a total recombination between H 2 and O 2 which is catalyzed by the zeolites.

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