Ll, Lα, Lβ and Lγ X-ray production cross-sections and yields of some selected elements between caesium and erbium following ionization by 59.54 keV γ rays

Ll, L alpha, L beta and L gamma X-ray production cross-sections were measured in elements from Cs to Er following ionization for 59.54 keV gamma-rays from an Am-241 point source. The measured values are compared with theoretical predictions estimated using subshell photoionization cross-sections, fluorescence yields, Coster-Kronig transition probabilities, K to L-i subshell vacancy transfer probabilities and radiative decay rates. Average L-shell fluorescence yields were deduced from present measured total L X-ray production cross-sections, theoretical K and L photoionization cross-sections and K to L vacancy transfer probabilities. The obtained results for L X-ray production cross-sections and average L-shell fluorescence yields are compared with recent experimental values, theoretical predictions, and semiempirical fits. (C) 2000 Elsevier Science B.V. All rights reserved.