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Dependence of the precision of uranium isotope ratio on particle diameter in individual particle analysis with SIMS

Esaka, Fumitaka ; Watanabe, Kazuo; Onodera, Takashi; Lee, C. G.; Magara, Masaaki ; Sakurai, Satoshi ; Usuda, Shigekazu

Isotope ratio analysis of individual uranium particles in environmental samples taken at nuclear facilities is one of the key techniques for nuclear safeguards. For accurate analysis, we developed a combined technique of single particle manipulation, which was carried out in scanning electron microscope (SEM), and SIMS. This technique gives information on particle size as well as isotope ratios for each particle. In the present study, the particle size dependence of the precision of uranium isotope ratio is investigated by using the SEM-SIMS technique. In the analysis of individual particles of a CRM U050 (5% enriched uranium) sample, even if the particle diameter was 0.5 $$mu$$m, the analysis with the precision of $$^{235}$$U/$$^{238}$$U isotope ratio within 5% was possible. In the presentation, the results obtained for the other uranium particles having different isotopic composition will also be presented.

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Category:Chemistry, Physical

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