Ll, L alpha, L beta and L gamma X-ray production cross-sections and yieldsof some selected elements between caesium and erbium following ionization by 59.54 keV gamma rays

Ll, L alpha, L beta and L gamma X-ray production cross-sections were measur ed 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 theoreti cal predictions estimated using subshell photoionization cross-sections, fl uorescence yields, Coster-Kronig transition probabilities, K to L-i subshel l vacancy transfer probabilities and radiative decay rates. Average L-shell fluorescence yields were deduced from present measured total L X-ray produ ction cross-sections, theoretical K and L photoionization cross-sections an d K to L vacancy transfer probabilities. The obtained results for L X-ray p roduction cross-sections and average L-shell fluorescence yields are compar ed with recent experimental values, theoretical predictions, and semiempiri cal fits. (C) 2000 Elsevier Science B.V. All rights reserved.