The Fluorescence Yield from theLIIILevel of Uranium

Abstract

The fluorescence yield, defined as the ratio of the number of fluorescence quanta emitted from the ${L}_{\mathrm{III}}$ level to the total number of incident quanta absorbed in the ${L}_{\mathrm{III}}$ level has been measured for uranium; and the value of 0.67 found. The relative intensities of the $\ensuremath{\alpha}$ to the $\ensuremath{\beta}$-lines in the $K$ fluorescence spectra of molybdenum have been measured and found to agree with the value from the characteristic spectrum. The relative intensities of the $\ensuremath{\alpha}$ to the $\ensuremath{\beta}$-lines originating from the ${L}_{\mathrm{III}}$ level have been measured in the fluorescence spectrum of uranium, and found to agree with the value from the characteristic spectrum. The atomic absorption coefficients for uranium for wave-lengths including the ${L}_{\mathrm{III}}$ discontinuity have been measured, and a value for $\ensuremath{\delta}=2.27$ found, where $\ensuremath{\delta}$ is the ratio of the absorption coefficients on the short and long wave-length sides of the ${L}_{\mathrm{III}}$ discontinuity.