Abstract
Chloride samples from the waters of Mono Lake, Pyramid Lake and the lower Truckee River have been examined by low-level counting techniques for chlorine-36 content. Chlorine-36 in the lake samples was found to be below the limit of detectability of the method, indicating a cosmic ray exposure age of less than 300,000 years for the chloride examined. No detectable chlorine-36 was found in surface chloride samples from three separate salt-flat locations in Utah and Nevada. Significantly detectable chlorine-36 was found in the lower Truckee River sample and it is suggested that this activity has its origin in recent thermonuclear tests. Hydrogen-deuterium ratios were determined for Mono Lake, Pyramid Lake, Lake Tahoe and associated streams. It is indicated that all three lakes lose water largely by evaporation, and that Lake Tahoe water has substantial residence time despite its outflow into the Truckee River. It is also indicated that the Truckee River is subject to strong dilution by fresh runoff water.
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