 The study aimed to determine the residence time of permafrost groundwater in eastern Siberia using tritium, chlorofluorocarbons, CFCs, and sulphur hexafluoride, SF underscore 6, as traces. Tritium analyses showed that the apparent age of groundwater ranged from around 1 to 55 years, with one spring water containing more than 90% water recharged by precipitation before the 1960s nuclear testing era. The study suggests that 3H and CFC, 12 are the most applicable traces for groundwater vulnerability assessments in this region, but further analysis is needed to assess the contribution ratio of superpermafrost and intrapermafrost groundwater. This article was authored by Tetsuya Hayama, Kozayoshiose, Alexander B. Kolesnikov, and others.