During the conduct of the Underground Nuclear Explosion Signatures Experiment (UNESE), which involved the injection of Ar-37 into UNE chimneys at the Nevada National Security Site, we detected the unanticipated presence of Ar-39 in gas samples taken from the shallow (0 – few m deep) subsurface. This long-lived UNE observable was present in all of our measurements in the vicinity of UNE sites,...
Phase 2 of the Underground Nuclear Explosion Signatures Experiment (UNESE) included the injection of tracer gases into the chimney of a historic horizontally-emplaced nuclear test at the Nevada National Security Site. The purpose of these injections was to observe the migration of gases from the chimney to the adjacent tunnel complex and their migration within the surrounding geology. Two...
