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

L-subshell (σ 1 ,σ 2 and σ 3 ) 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 L i -subshell fluorescence yields (ω 1 , ω 2 and ω 3 ) have been measured for the same elements using the previously measured cross section values and the theoretical L i -subshell photoionization cross section Coster-Kronig transition probabilities and emission rates. It is observed that the measured L i ( i = 1, 2 and 3) subshell x-ray fluorescence cross section and L i -subshell fluorescence yield (ω 1 , ω 2 and ω 3 ) 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.