“…Different oxidation numbers of Ta and W compounds lead to the alteration of the binding energies for the valance electrons. Furthermore, many investigations about the chemical effect on the X-ray fluorescence parameters have been performed by the other researchers (Padhi et al, 1994;Tıraşoğlu et al, 2001;Baştuğ, 2008;Kumar et al 2010;Turşucu and Demir (2013).…”