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http://dx.doi.org/10.5478/MSL.2011.2.4.080

Feasibility Study of Isotope Ratio Analysis of Individual Uranium-Plutonium Mixed Oxide Particles with SIMS and ICP-MS  

Esaka, Fumitaka (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Magara, Masaaki (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Suzuki, Daisuke (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Miyamoto, Yutaka (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Lee, Chi-Gyu (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Kimura, Takaumi (Research Group for Radiochemistry, Japan Atomic Energy Agency)
Publication Information
Mass Spectrometry Letters / v.2, no.4, 2011 , pp. 80-83 More about this Journal
Abstract
Isotope ratio analysis of nuclear materials in individual particles is of great importance for nuclear safeguards. Although secondary ion mass spectrometry (SIMS) and thermal ionization mass spectrometry (TIMS) are utilized for the analysis of individual uranium particles, few studies were conducted for the analysis of individual uranium-plutonium mixed oxide particles. In this study, we applied 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.
Keywords
SIMS; ICP-MS; Isotope ratio; Uranium; Plutonium;
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