PRODUCTION OF MONOENERGETIC UNPOLARIZED K-ALPHA X-RAY PHOTONS USING X-RAY TUBES - AN ANALYSIS OF THE DERIVED INTENSITY RATIOS AND HOMOGENEITY OF THE FILTERS

Monoenergetic unpolarised K alpha-radiation is produced by filtering t he K beta radiation emitted by the secondary target in transmission an d reflection modes. In the transmission mode photons with low energy a nd photons with energy larger than that of the discontinuity are absor bed considerably by the filter. Only photons with energy approximately in the energy interval [(E(k)-5 keV)--(E(k))] are able to cross the f ilter giving rise to a peak of about 2 keV full width at half maximum. In the reflection mode the secondary target is placed at an angle of 45 degrees. The variation of the K alpha(2)/K alpha(1) intensity ratio at various concentrations and the homogeneity of the filters have bee n studied.