Akademik Veri Yönetim Sistemi
RADIATION PHYSICS AND CHEMISTRY, cilt.81, sa.5, ss.489-494, 2012 (SCI-Expanded)
The energy dependence of photon-induced K alpha and K beta x-ray production (or x-ray fluorescence) cross-sections for Sr, Y, Mo, Ru, Pd, Ag, In and Sb elements has been studied in the energy range of 20-50 keV using Energy Dispersive X-Ray Fluorescence (EDXRF) Spectrometry. The photon energy dependence of K x-ray production cross-sections was measured with secondary excitation method. A radioisotope point source of Am-241 was employed to excite the K x-rays of secondary exciter elements. The L x-ray yields from Th and U were measured to determine I(o)G (the intensity of exciter K x-rays falling on primary target). The measurements have been made by observing the x-ray emissions with the help of HPGe detector coupled with a multichannel analyzer. The areas of the K alpha and K beta spectral peaks, as well as the net peak areas, have been determined by a fitting process. The measured K alpha and K beta x-ray production cross-sections have been compared with calculated theoretical values in this energy regime. The present experimental results for all the elements were in general agreement with the theoretical values calculated using photoionization cross-sections, fractional rates (based on Hartree-Slater potentials) and fluorescence yields. (C) 2012 Elsevier Ltd. All rights reserved.