L x-ray fluorescence cross-sections of heavy elements in the atomic region 57 <= Z <= 71 excited by 17.78 keV photons

摘要

L x-ray fluorescence cross-sections (sigma(Lalpha), sigma(Lbeta), and sigma(Lgamma)) were measured with an accuracy of 6% (except for the Lgamma x-ray line around 8%) for La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Lu at an excitation energy of 17.78 keV. Relative intensities I-Kbeta/I-Kalpha. and I-Lgamma/I-Lalpha. were also measured for the same elements. The measured cross-sections were compared with experimental and theoretical values. Measurements of the emitted x-rays were performed using an Si(Li) detector. Copyright (C) 2004 John Wiley Sons, Ltd.