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Feasibility study of isotope ratio analysis of individual uranium-plutonium mixed oxide particles with SIMS and ICP-MS

Esaka, Fumitaka ; Magara, Masaaki ; Suzuki, Daisuke  ; Miyamoto, Yutaka  ; Lee, C. G.; Kimura, Takaumi 

In this study, we applied secondary ion mass spectrometry (SIMS) and inductively coupled plasma mass spectrometry (ICP-MS) to the isotope ratio analysis of individual U-Pu mixed oxide particles. In the analysis of individual U-Pu particles prepared from mixed solution of uranium and plutonium standard reference materials, accurate $$^{235}$$U/$$^{238}$$U, $$^{240}$$Pu/$$^{239}$$Pu and $$^{242}$$Pu/$$^{239}$$Pu isotope ratios were obtained with both methods. However, accurate analysis of $$^{241}$$Pu/$$^{239}$$Pu isotope ratio was impossible, due to the interference of the $$^{241}$$Am peak to the $$^{241}$$Pu peak. In addition, it was indicated that the interference of the $$^{238}$$UH peak to the $$^{239}$$Pu peak has a possibility to prevent accurate analysis of plutonium isotope ratios. These problems would be avoided by a combination of ICP-MS and chemical separation of uranium, plutonium and americium in individual U-Pu particles.

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