Measurement of Kα to Lα and Kβ to Lβ intensity ratios of seven elements in the atomic number range 56 ≤ Z ≤ 66 using photoionization at 59.54 keV

K alpha to L alpha and K beta to L beta intensity ratios for elements Ba, La, Ce, Nd, Sm, Tb, and Dy have been measured at the excitation energy of 59.54 keV gamma -rays from Am-241 radioactive source of strength 100 mCi. Intensity ratios were determined by measuring K and L X-rays emitted from standard target of a given element. Theoretical values of the K alpha to L alpha and K beta to L beta intensity ratios were calculated using theoretically tabulated values of shell/subshell photoionization cross-sections, fluorescence yields, Coster-Kronig transition probabilities and radiative decay rates for eta (KLi) not equal 0 and eta (KLi) = 0. Experimental results were compared with the theoretical values. (C) 2001 Elsevier Science Ltd. All rights reserved.