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Esaka, Fumitaka; Watanabe, Kazuo; Onodera, Takashi; Lee, C. G.; Magara, Masaaki; Sakurai, Satoshi; Usuda, Shigekazu
Applied Surface Science, 255(4), p.1512 - 1515, 2008/12
Times Cited Count：9 Percentile：40.55(Chemistry, Physical)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 
m, the analysis with the precision of 
U/
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.
Osawa, Takahito; Esaka, Fumitaka
no journal, ,
Stable-isotope fractionation was observed in redox reaction of chromium in laboratory experiments. Electroplating process of transition elements is active redox reaction between liquid and solid phase and some degree of mass-dependent or independent isotopic fractionation is expected. In order to clarify the isotopic fractionation in electroplating, we analysed Ni and Cu isotopes on the surface of electroplates using Cameca ims-6f ion microprobe and determined fractionation factors. Electrodes and solution were completely homogenised in isotopes and thin coating on an electrode were done under various current and temperatures. 58Ni, 60Ni, and 62Ni were measured in Ni analysis, and 63Cu and 65Cu were measured in Cu analysis. We did not use any kind of spikes in this work. In contrast with a previous report by Kavner et al. (2005), we found no voltage-dependent fractionation.
