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Distribution of radionuclides in gypsum wash sediments

Abstract The Gypsum Wash is a highly eroded waterway channel located in the Lake Mead National Recreation Area of southern Nevada. The Wash carries surface runoff from highlands east of Las Vegas to Lake Mead. Fine and course samples of surface sediments were collected at 100‐m intervals and analyzed to determine the distribution of 7‐emitting radionuclides in the lower 12,200 m of the Wash channel. Results indicate the levels of naturally occurring radionuclides such as 40K, 224Ra, 226Ra, 235U, and 228Ac found in Wash sediments were consistent with levels commonly found in southeast Nevada soils. However, the levels of 137Cs in course sediment samples were found to be generally lower than typically found in other desert washes surrounding Lake Mead.