A study is made of the isotopic shift of ${\mathrm{U}}^{238}$, ${\mathrm{U}}^{235}$, and ${\mathrm{U}}^{233}$ in the emission spectrum of uranium. The shift is sufficient to allow quantitative determination of the concentration of the components of a mixture of the uranium isotopes by routine spectrographic analysis. Data show comparative values obtained by mass spectrometer and spectrograph.

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