L X-ray intensity ratios for high Z elements induced with X-ray tube

We have studied the intensity ratios I(Lα_1,2)/I(Lβ_1,2), I(Lα_1,2)/I(Lγ) and I(Lβ_1,2)/I(Lγ) for elements Ta, W, Au and Pb by 13.1keV bremsstrahlung radiation. In this work, experimental values were compared with the theoretical results and other experimental results. Theoretical results of the intensity ratios were calculated with theoretical subshell photoionization cross sections, fractional X-ray emission rates, fluorescence yields, and Coster-Kronig transition probabilities. Good agreement can be observed between experimental values and theoretical results. Comparing with L₁ and L₂ subshells, the ionization cross section of L₃ subshell shows a large increase for Ta and W with the variation of excitation energy from 59.5keV to 13.1keV.