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.
