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Usefulness of fallout-generated 241Am as a geochronology tool in salt marsh sediments: Insights from Oregon on the U.S. West Coast
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| Created: | Feb 16, 2026 at 11:57 p.m. (UTC) | |
| Last updated: | Feb 16, 2026 at 11:59 p.m. (UTC) | |
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| Sharing Status: | Public |
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Abstract
Studying coastal ecogeomorphic change relies on reliably and accurately dating recent sediment deposits. While a handful of short-lived radioisotopes are proven suitable geochronometers, all have limitations. One particularly useful anthropogenic radionuclide, 137Cs, is rapidly approaching extinction due to its half-life. We evaluate whether the bomb-produced radionuclide 241Am is a reliable alternative to 137Cs. In 75 cores from eight Oregon intertidal zones, 241Am was readily detectable in higher-elevation marsh sediments and, when present, was less mobile post-deposition than 137Cs. Accretion derived from the depth of the 241Am and 137Cs peaks associated with the height of nuclear proliferation were statistically similar to rates determined from excess 210Pb. Although 241Am activities are relatively low in these environments, their detectability is expected to increase as 241Pu continues to decay. 241Am may therefore be an accurate event-horizon chronometer in high marsh sediments, and will likely become an increasingly preferable dating technique compared to 137Cs geochronology.
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