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June 18, 2026RADIOISOTOPESOpen Access

Scientific Analysis of the RIU2 Sample Associated with Uranium Enrichment Experiment and Preserved at Yamagata University

Fuyuki Tokanai Manabu Ishizaki Emiko Inui Hirohisa SAKURAI Tôru Moriya Mirei Takeyama K. Morimoto

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Key Points

This study aims to evaluate the chemical composition and phases of the RIU2 sample associated with a uranium enrichment experiment.
Analyzed uranium isotope composition using ICP-MS, obtaining a 0.72% presence ratio of 235U.
Conducted gamma spectrometry to assess energy-dependent intensity of peaks from various uranium isotopes.
Utilized SEM–EDS to identify major components U, F, and O, and performed XRD analysis for crystallographic assessment.
The uranium in the RIU2 sample aligns with natural isotopic ratios, supporting a 0.72% presence of 235U.
Gamma spectrometry results match those of natural uranium, reinforcing the findings from ICP-MS.
XRD indicated UF4 as a major component, but some unidentified peaks remained, complicating complete phase identification.

Implication

Evaluates uranium isotope composition in RIU2 sample, suggesting its natural composition and mixed phase.

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Cite This Study

Tokanai et al. (2026) studied this question.

synapsesocial.com/papers/6a3632d2db0793dc1a53950c https://doi.org/10.3769/radioisotopes.750205

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