Angular dependence of L x-ray production cross sections for Pt and Au elements in an external magnetic field

The effect of the external magnetic field has been investigated on the Ll, Lα, Lβ and Lγ production cross sections of Pt and Au elements in the angular range 90°-150° by using an energy dispersive x-ray fluorescence spectrometer. The samples were irradiated by using the gamma rays of 59.537 keV emitted from an ^{241}Am radioisotope source of 100 mCi. The external magnetic fields have been applied two opposite directions and the magnitude of the external magnetic field has been fixed at +0.75 T and -0.75 T. For B=0, Ll and Lα groups in the L x-ray lines are found to be spatially anisotropic, while those in the Lβ and Lγ peaks are isotropic. An enhancement in the differential Ll and Lα production cross sections is observed in the presence of external magnetic field. Integral cross sections for production of Ll, Lα, Lβ and Lγ x-rays were also deduced and were found to be in good agreement with the theoretical values for B=0.