Behaviors and transfers of anthropogenic radionuclides (137Cs, 239+240Pu and 241Am) in a protected alpine wetland (France)

Abstract

The aim of this study is to confirm and increase the knowledge on anthropogenic radionuclide (RN) behavior ( 137 Cs, 239?240 Pu, 241 Am) in natural compartments (artificial pool in a protected upland area). The novelty lies on comparisons of the three main compartments (pool water, soil, sediments) of this original mountainous site. Migration processes and transfers were particularly detailed in the light of two processes: lixiviation and leaching. Regarding 238 U, anthropogenic RNs, lithology, organic matter contents, sedimentation rates ( 210 Pb) and isotopic mass balances, RNs are mainly transported by leaching processes with higher 241 Am indepth mobility compared to 137 Cs (intermediate for 239?240 Pu).

Environmental Chemistry of Radionuclides : Open Questions and Perspectives

“…[45] In sediment samples, MTR have a low relative mobility, 241 Am being the most mobile element and 137 Cs the less mobile, 238,239 + 240 Pu having an intermediate behavior. [46] The vertical distribution of Cs was explained by its low mobility due to important adsorption capacities of solid matrices leading to its immobilization. In short, the order of mobility Am > Pu > Cs reflects their various chemical and biochemical reactivities.…”

“…Leaching carries MTR from the drainage basin slopes, to the clearing and then to the sediment through the aqueous phase [45] . In sediment samples, MTR have a low relative mobility, 241 Am being the most mobile element and 137 Cs the less mobile, 238,239+240 Pu having an intermediate behavior [46] . The vertical distribution of Cs was explained by its low mobility due to important adsorption capacities of solid matrices leading to its immobilization.…”