The radiolytic stability of hydrophobic extracting compounds CyMe4-BTBP and CyMe4-BTPhen and a hydrophilic masking agent (PhSO3H)2-BTPhen, widely employed for trivalent minor actinoid and lanthanoid separation, against γ radiation was tested. Even though the solvent with a promising fluorinated diluent BK-1 provides better extraction properties compared to octan-1-ol, its radiation stability is much lower, and no extraction was observed already after an absorbed dose of 150 kGy (CyMe4-BTBP) or 200 kGy (CyMe4-BTPhen). For the (PhSO3H)2-BTPhen hydrophilic masking agent, the results showed that the rate of radiolytic degradation was significantly higher in 0.25 M HNO3 than in 0.5 M HNO3. For both the hydrophobic and hydrophilic agents, degradation was slower in the presence of both organic and aqueous phases during irradiation.

Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Brehova 7 115 19 Prague Czech Republic

Institute of Inorganic Chemistry Academy of Sciences of the Czech Republic Hlavni 1001 250 68 Rez Near Prague Czech Republic

Laboratory of Molecular Nanofabrication University of Twente P O Box 217 7500 AE Enschede The Netherlands

Laboratory of Sensors ITMO University Lomonosova St 9 191002 Saint Petersburg Russian Federation

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