Measurement of Lα/Ll, Lα/Lβ and Lα/Lγ X-ray intensity ratios for elements in the atomic range 57 ≤ Z ≤ 92 using radioisotope X-ray fluorescence

L alpha /Ll, L alpha /L beta and L alpha /L gamma intensity ratios have been measured for some elements with atomic range 57 less than or equal to Z less than or equal to 92 by using characteristic L X-rays from targets excited by 59.54 keV photons from a filtered radioisotope Am-241 point source. Theoretical values of the L alpha /Ll, L alpha /L beta and L alpha /L gamma intensity ratios were calculated using theoretically tabulated values of subshell photoionization cross-sections, fluorescence yields, fractional X-ray emission rates, Coster-Kronig transition probabilities. Experimental results have been compared with the theoretical values and other available experimental results. Good agreement was observed between experimental results, other available experimental results and theoretically calculated values. (C) 2001 Elsevier Science B.V. All rights reserved.