226Ra, 238U, 234U, 230Th and 232Th in a variety of soils sampled from geological formations in the NE of the Basin of Paris]]>

摘要

Highlights ? 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 compared to both 238U and 230Th which remains poorly explained up to now. ? The retention of radium in the soil and/or degradation process of the litter are assumed to explain litters signatures. ]]>