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Detailed analysis of individual uranium particles in environmental sample by SIMS and pre-screening measurement introduced into the analysis procedure

Tomita, Ryohei ; Esaka, Fumitaka ; Miyamoto, Yutaka  

In the previous study, we developed a combination method of individual uranium particle manipulation in scanning electron microscope (SEM) and secondary ion mass spectrometry (SIMS) for removing the interferences from other elements in other particles. Since the particles were selected randomly and manipulated, it caused the problem not to cover the range of $$^{235}$$U/$$^{238}$$U isotope ratio in the sample. In this study, we introduced pre-screening measurement into the procedure of analyzing uranium isotope ratios in individual particles by SIMS to cover the range of $$^{235}$$U/$$^{238}$$U in the sample.

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