Determination of L X-ray fluorescence cross-sections in the atomic range of elements 57 <=( )Z <= 69 in an external magnetic field

L X-ray fluorescence cross sections have been determined for La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er and Tm elements at the magnetic field (B = 0.8 Tesla) and without magnetic field with energy dispersive X-ray fluorescence spectroscopy (EDXRF) technique. The fluorescence spectra were obtained by using Si(Li) solid-state detector with a high resolution and 241Am radioactive point source (with 59.5 keV gamma-rays). The results have been compared with the theoretical results without the magnetic field. It has been observed a good agreement between the experimental and the theoretical results and that L X-ray fluorescence cross sections of Lanthanide elements change with the magnetic field except sigma(Ll) of Gd, sigma(L beta) of Dy and sigma(L gamma) of Ce and Tm. (C) 2021 Elsevier B.V. All rights reserved.