Abstract
Process for decontaminating and/or cleansing an org. solid substrate contaminated with solid, radioactive, inorg. contaminants, in particles, in which: said solid substrate is brought into contact with an extn. medium, free of water, comprising: dense CO2 under pressure; at least one non-halogenated surfactant compd. chosen from block copolymers of poly(ethylene oxide) PEO and of poly(propylene oxide) PPO, such as (EO)x-(PO)y diblock copolymers, (EO)x-(PO)y-(EO)x triblock copolymers and (PO)x-(EO)y-(PO)x triblock copolymers, where x and y are integers from 2 to 80 with x being different from y; and poly(C1 to C6)dialkylsiloxanes such as polydimethylsiloxane (PDMS); and at least one complexing agent chosen from tri-Bu phosphate (TBP), crown ethers, tributylphosphine oxide, triphenylphosphine oxide, and tri-n-octylphosphine oxide; the solid substrate and/or the extn. medium are subjected to a mech. action, simultaneously with the bringing into contact.