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•U, 234U, 230Th and 226Ra were determined in soils sampled on geological formations from the NE of the Basin of Paris.•Ra is correlated with the finest soil fraction (<2 µm), suggesting this latter is involved in the retention of radium.•The enrichment of soils in 226Ra compared to 238U and 230Th is associated with mica-like mineral, i.e. illite-smectite.•Unlike soils, litters exhibit 226Ra depletion...
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