It is clear that detailed studies performed under identical experimental conditions are desirable to determine the effect of the chemical environment on the value of intensity ratios. To better understand this effect, we conducted measurements on K beta(1)/K alpha, K beta(2)/K alpha, K beta(2)/K beta(1) and K beta/K alpha x-ray intensity ratios. The K alpha and K beta(1,2) emission spectra for compounds of 4d transition metals Y, Zr, Nb, and Mo were measured using a Si(Li) solid-state detector. The samples were excited by 22.69 keV x-rays emitted from a Cd-109 radioisotopes source. The experimental results for pure elements are compared with the other experimental and theoretical values.