Measurement of LI, L alpha, L beta and L gamma X-ray fluorescence cross-sections in heavy elements excited by 59.5 and 123.6 keV photons

L1, L alpha, L beta and L gamma XRF cross-sections were measured in heavy elements 73 less than or equal to Z less than or equal to 92 at excitation energies of 59.5 and 123.6keV photons. Measurements were made using two excitation sources. The experimental values of the cross-sections were determined by measuring the absolute yield of L-subshell X-rays emitted from a target of a given element and thickness when it was bombarded with a known flux of photons of given energy. It is observed that the measured L XRF cross-section values for the elements are in general agreement with the theoretical ones evaluated using L-subshell fluorescent yields (omega(i)) and Coster-Kronig transition probabilities (f(ij)) based on the relativistic Dirac-Hartree-Slater theory. The present and previous measured and calculated values of the cross-sections are tabulated to bring out the existing status of L X-rays production cross-sections.