Determinations of the tritium (3H) content of ground ice collected near Mayo, Yukon Territory, indicate that since the mid-1950s atmospheric water has infiltrated permafrost to depths of up to 50cm. The rate of tritium infiltration into permafrost at two plots irrigated with tritiated water in 1983 suggests that tritium movement is principally due to temperature-induced mass transport rather than molecular diffusion. -Authors
Canadian Journal of Earth Sciences
Department of Geography and Environmental Studies

Burn, C, & Michel, F.A. (F. A.). (1988). Evidence for recent temperature-induced water migration into permafrost from the tritium content of ground ice near Mayo, Yukon Territory, Canada. Canadian Journal of Earth Sciences, 25(6), 909–915. doi:10.1139/e88-087