Radiolysis of C5-BTBP in cyclohexanone irradiated in the absence and presence of an aqueous phase
2012
Spent nuclear fuel contains many highly ra-
dioactive species; hence solvents used in reprocessing will
be subjected to radiolysis. In this study, solvents containing
one of the BTBP molecules intended for the separation of
trivalent actinides and lanthanides, the so called C5-BTBP,
have been subjected to radiolysis and hydrolysis. We present
here that this compound shows a dramatic decrease in both
distribution ratios and separation factor when irradiated with
higher doses up to 50 kGy; particularly in the presence of
an aqueous phase. Furthermore, fast hydrolytic degradation is
observed, which significantly contributes to the overall degree
of decomposition. This is supported by speciation studies per-
formed by HPLC and LC-MS methods. Proposed structures
of the highest-yield degradation products are presented and
they seem to confirm previously drawn structures for these
products. From these studies it can be concluded that the
presence of nitric acid or nitrate during irradiation leads to
higher content of species containing keto groups.
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