Extensive single-configuration Dirac-Fock (DF) calculations (within the mul
ticonfiguration DF method) have been performed for sulphur to explain the i
nfluence of removing electrons from L and M shells on the average KP and Ka
x-ray transition energies and the values of K beta/K alpha intensity ratio
. Our results can be used for interpreting the measured K X-ray spectra acc
ompanying the ionization of sulphur projectiles or sulphur targets.