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Development of analytical methods for $$^{107}$$Pd in high-level radioactive wastes using laser-induced particle formation

Yomogida, Takumi   ; Asai, Shiho; Saeki, Morihisa; Hanzawa, Yukiko  ; Esaka, Fumitaka  ; Oba, Hironori  ; Magara, Masaaki  

$$^{107}$$Pd contained in high-level radioactive wastes (HLW) is a long-lived fission product. The procedure for $$^{107}$$Pd determination in HLW is demanded for safety assessment of geological disposal. Radiation measurement is difficult due to very low energy of beta radiation of $$^{107}$$Pd. Chemical separations and mass spectrometry methods are superior to the radiation measurement, but it has some problems on complicated analysis processes and $$^{107}$$Ag isobar contamination. We performed a novel procedure for $$^{107}$$Pd determination by laser-induced particle formation to overcome those problems. In this study, Pd separation by laser-induced particle formation was applied to the analysis of simulated HLW solutions. ICP-MS measurements demonstrated that the recovery ratio of Pd depended on solutions and ethanol concentrations in laser irradiation. The low contamination ratio indicated the high elemental selectivity of laser-induced particle formation.

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