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Analysis of 287 soil, sediment and house dust samples collected in a 200 km2-zone in northern St. Louis County, Missouri, establish that offsite migration of radiological contaminants from Manhattan Project-era uranium processing wastes has occurred in this populated area. Specifically, 48% of samples (111 of a subset of 229 soils and sediments tested) had 210Pb concentrations above the risk-based...
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