Helium release from aged palladium tritide

Palladium tritides at the initial tritium/palladium (T/Pd) atomic ratio of 0.65 were prepared by gaseous P–V–T method. The 3He release behavior in the aged palladium tritides for 604, 1265 and 2168days with the initial tritium/palladium atomic ratio of 0.65, has been studied by the methods of D–T isotopes exchange and aqua regia dissolution separately. The results of D–T exchange experiment show that the 3He release ratios in these three different time aged palladium tritides are 1.7%, 2.1% and 3.3%, leaving more than 96.7% 3He kept in palladium tritides Lattice. A similar result can also been obtained by aqua regia dissolution method, and the 3He release ratios are 2.0%, 2.9% and 3.3% by comparison. The similarity reveals a strong 3He retain ability of palladium tritides. The experimental data by two methods agree well with each other.