Abstract
Equilibrium between He dissolved in water and He inside a ping-pong ball, when confined together inside an airtight container, is reached in 4 days and in about 2 days in the case of 6.4 mm O.D., 0.8 mm wall latex tubing. Ping-pong balls and sections of latex tubing closed at both ends, and filled with air, were left to equilibrate with freshly collected organic lake sediment samples inside closed, completely filled, 467 ml glass jars and then analysed for He. Using this method two lakes in northern Saskatchewan were found to contain anomalous He in the sediment even though their waters contained atmospheric equilibrium concentrations of He. One lake is known, and the other inferred, to lie over a fracture zone. One is 1 km and the other 1.5 km from known U deposits. However, the source of the excess He is more likely due to upwelling, He-rich groundwaters through fractures, rather than the U deposits. This lake sediment He method makes possible the detection of fault and fracture zones during the summer when wind and sun have destroyed the thermoclines in lake waters. It could also be useful for detecting subsurface U deposits in porous sedimentary strata and deposits associated with fault and fracture zones.
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