Method and device for reducing outgassing of tritiated waste from the nuclear industry

Method of reducing the amount of tritiated hydrogen (T2 or HT) and / or tritiated water (HTO or T2O) generated by at least one package comprising at least one tritiated waste (5) from the nuclear industry, the method characterized it comprises the following steps: - putting in the presence of the package with a mixture (2) comprising manganese dioxide (MnO2) combined with a compound containing silver; - putting into presence bulk with at least one molecular sieve (1).