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Title
Fracturing-induced release of radiogenic <sup>4</sup> He and <sup>234</sup> U into groundwater during the last deglaciation: An alternative source to crustal helium fluxes in periglacial aquifers.
External 4He sources have been invoked to explain 4He concentrations in groundwater greater than those expected from in situ U and Th production. In a fractured aquifer of Ordovician age located in the St. Lawrence Lowlands (Quebec, Canada), 4He concentrations of up to 4.48 × 10−5 cm3 STP