Development of analytical methods for 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

no journal, , 

Pd contained in high-level radioactive wastes (HLW) is a long-lived fission product. The procedure for 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 Pd. Chemical separations and mass spectrometry methods are superior to the radiation measurement, but it has some problems on complicated analysis processes and Ag isobar contamination. We performed a novel procedure for 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.