LX-Ray Intensity Ratios of U, Th, Pb, Ta, and Lu byα-Particle-Induced Emission

The $L$ X-ray intensity ratios $\frac{L {\alpha }_{1,2}}{L_l}$, $\frac{L {\alpha }_{1,2}}{L {\beta }_{2,15}}$, $\frac{L {\alpha }_{1,2}}{L {\beta }_6}$, $\frac{L {\beta }_1}{L \eta }$, and $\frac{L {\beta }_1}{L {\gamma }_1}$ were measured for the elements U, Th, Pb, Ta, and Lu by ionization of $L$-subshell electrons from 26-MeV $\alpha$-particle bombardment of thin elemental foils. Comparison of the measured ratios with theoretical transition-rate ratios obtained from a relativistic Hartree-Fock-Slater model showed agreement within experimental error for those cases in which photopeaks were separable.