Abstract
Measurements of 36Cl in cuttings from a borehole that was drilled 387 m into unsaturated tuffs indicate the possible detection of significant radioactive decay of cosmogenic 36Cl in two of the samples. However, the 36Cl/Cl ratio was found to vary with the amount of pulverization of the cuttings. Work is in progress to separate the 36Cl/Cl data into cosmogenic and in situ components. The cosmogenic component will be used to trace very slow water movements through the unsaturated zone. Bomb pulse 36Cl was observed as deep as 153 m, and this identification is not constrained by the problem with pulverization. This work shows the efficacy of Cl measurements for detecting modern water movements deep in the unsaturated zone.
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