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Shimada, Asako; Kameo, Yutaka
no journal, ,
no abstracts in English
Suwa, Toshio; Kuno, Takehiko; Sato, Soichi; Onuma, Kazuhiro*; Kohata, Masato*; Kawasaki, Satoshi
no journal, ,
no abstracts in English
Zr isotope standard solution for isotope dilution mass spectrometryKonda, Miki; Asai, Shiho; Hanzawa, Yukiko; Magara, Masaaki
no journal, ,
It is important to measure the inventory of radionuclides in high-level radioactive waste for safe and reasonable geological disposal of the waste. For verification of the reliability of the inventory assessment by measured value, we planned to quantify the long-lived nuclides 
Zr, that is important for safety evaluation of radioactive waste disposal, using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) we developed. Spike (isotope standard solution) is required to apply the IDMS. We prepare Zr isotope standard solution by dissolving the metallic Zr isotope standard. The metallic Zr dissolves in HF, but HF dissolve glass and has high toxicity. Therefore it is necessary to reduce an amount of HF and to simplify a dissolution method. At first, we examined the dissolution method of the metallic Zr. The isotope standard of Zr was dissolved under optimum condition that obtained by the previous examination. The prepared Zr isotope standard solution was measured using the IDMS to determine concentration, which gave us a high-accuracy value.
Pd in high-level radioactive wastes using laser-induced particle formationYomogida, 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.