In this study, the semi-empirical and empirical calculations of K X-ray intensity ratios, K-shell fluorescence yields, and vacancy transfer probabilities have been performed for 3d transition elements. Also, r Ka , r Kb production cross-sections, K b =K a intensity ratios, x K fluorescence yields, and g KL vacancy transfer probabilities of 3d transition elements have been measured. The samples were excited by 59.5 keV c-rays from a 241 Am annular radioactive source. K X-rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV.