The permeation rates were measured by using an electrochemical method in which an aqueous solution of T was used as a cathodic electrolyte. The T and H were introduced from one side of a membrane via cathodic polarization using a constant current density. On the other side, the T and H were extracted by potentiostatic ionization. The separation factor was equal to 12 at 288K. This value was independent of the cathodic current density. The diffusion coefficients of T and H were deduced from the permeation time-lag. In the case of annealed specimens at 286K, the T and H diffusivities were 9 x 10-10 and 4 x 10-9m2/s, respectively. In the case of 9% cold-worked material at 284K, the corresponding values were 3 x 10-10 and 4 x 10-10m2/s.

Electrochemical Measurement of Tritium and Hydrogen Permeation through Iron Membranes. H.Hagi, Y.Hayashi: Transactions of the Japan Institute of Metals, 1988, 29[5], 373-82