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Report No.
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Separation of platinum-group metals from radioactive waste liquid by laser induced particle formation

Saeki, Morihisa*; Asai, Shiho; Yomogida, Takumi  ; Hanzawa, Yukiko ; Taguchi, Tomitsugu*; Horita, Takuma ; Kitatsuji, Yoshihiro ; Oba, Hironori*

Platinum-group metals (PGMs), such as Pd, Ru, and Rh are generated by nuclear fission of U and can be found in spent nuclear fuel (SNF) and high-level radioactive waste (HLW). Separation techniques for PGMs from HLW have been investigated for the safety assessment of HLW and the reuse of PGMs as resources. Among such PGMs, only Pd has a long-lived radionuclide $$^{107}$$Pd. Accordingly, the precise measurement of the amount of $$^{107}$$Pd in HLW is essential for the long-term safety management of HLW. The determination of $$^{107}$$Pd requires a reliable separation technique that allows selective Pd recovery with high purity. We developed a new separation technique specialized for PGMs. The technique involves UV-laser irradiation that induces selective reduction of ions of PGMs. The reduced PGMs can be readily recovered as precipitates. At the conference, the separation performances of PGMs and some applications of our technique will be discussed.

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