In this study, K-beta/K-alpha X-ray intensity ratios, sigma(K alpha), sigma(K beta) production cross-sections and omega(K) fluorescence yields of Co and Cu and L-beta/L-alpha X-ray intensity ratios, sigma(L alpha), sigma(L beta) production cross-sections and pi(L) average fluorescence yields of Ag in pure metals and in different alloy compositions were measured. In this study, alloying effects on the sigma(K beta) production cross-sections of Co and Cu were investigated and changes interpreted according to the rearrangement of valance state electrons and the charge transfer process between the 3d elements (Co and Cu) and Ag. (C) 2009 Elsevier B. V. All rights reserved.