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In page Nuclear reprocessing:

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Selective ActiNide EXtraction. As part of the management of minor actinides it has been proposed that the lanthanides and trivalent minor actinides should be removed from the PUREX raffinate by a process such as DIAMEX or TRUEX. To allow the actinides such as americium to be either reused in industrial sources or used as fuel, the lanthanides must be removed. Several lanthanides have large neutron cross-sections and poison a neutron-driven nuclear reactions. To date the extraction system has not been defined, but research groups are working towards a process. For instance CEA is working on a bis-triazinyl pyridine (BTP) process.[1][2][3] Other systems such as dithiophosphinic acids are under investigation.[citation needed]