“…In order to evaluate the presence and concentration of chemical elements, the technique used in this study was neutron activation analysis (NAA), applying the k 0 -standardization method [23][24][25]. The neutron activation analysis is a very sensitive and reliable multielemental technique, suitable for determination of the elements such as: As, Ba, Br, Ca, Ce, Cl, Co, Cr, Eu, Fe, Hf, Mg, Mn, Na, Sb, Sc, Sm, Ti and Zn, in different drugs [14]. The technique is based on the principle that when the material is irradiated by neutrons, some elements with suitable nuclear characteristics become radioactive isotopes.…”