RADIOCHEMICAL STABILITY OF DICYCLOHEXANO-18-CROWN-6 ETHER (DCH18C6) AND ITS USE IN A RECOVERY PROCESS OF STRONTIUM FROM ACIDIC NUCLEAR WASTE STREAM

The cis-syn-cis isomer of the dicyclohexano-18-crown-6 ether (DCH18C6) was subjected to radiolysis with a Cs-137 gamma-source. The cis-syn-c is DCH18C6 radiolytic products were synthesized in their different con figurations and tested on aqueous synthetic solutions of spent nuclear fuels: no influence of the degradation products was detected. So, goo d prospects for the application of DCH18C6 to the spent nuclear fuels reprocessing as well as liquid effluents treatment was demonstrated. T hus, a process combining selective liquid-liquid extraction (DCH18C8-C HCl3,) with solid-liquid extraction (Duolite ARC-9652) for strontium t races removal from acidic waste streams is described. This process all ows to a high strontium decontamination factor (250) with a very impor tant extraction factor [1] (5000) in the presence of 30.10(3) molar ex cess of sodium.