L-subshell fluorescence cross sections and L-subshell fluorescence yields in elements 68 ⩽ Z ⩽ 92 by 59.5 keV photons

Abstract

L-subshell (σ1,σ2 and σ3) x-ray fluorescence cross sections were measured for Er, Ta, W, Au, Hg, Tl, Pb, Bi, Th and U at an excitation energy of 59.5 keV using a Si(Li) detector coupled to a model 4096 computerized multi-channel analyser. The values of Li-subshell fluorescence yields (ω1, ω2 and ω3) have been measured for the same elements using the previously measured cross section values and the theoretical Li-subshell photoionization cross section Coster-Kronig transition probabilities and emission rates. It is observed that the measured Li (i = 1, 2 and 3) subshell x-ray fluorescence cross section and Li-subshell fluorescence yield (ω1, ω2 and ω3) values for the elements are in general agreement with the theoretical ones evaluated using L-subshell fluorescence yields and the L-subshell photoionization cross section.