DETERMINATION OF DIAGNOSTIC-X-RAY SPECTRA SCATTERED BY A PHANTOM

Photon spectra are reported that result from the scatter of diagnostic X rays at an appropriate water phantom that represents a patient. The tube voltages considered are between 52 kV and 110 kV, the scatter an gles range from 10 degrees to 142 degrees to the normal radiation inci dence direction. All spectral measurements were performed with a high- purity germanium detector. Spectral photon fluences are computed from the measured pulse height distribution by using an unfolding procedure . The required response functions of the detection system were obtaine d by using Monte Carlo methods. Reference is made to a catalogue compi ling 35 spectra of scattered X rays in diagnostics resulting from a hu man substitute, together with information on relevant primary field pa rameters as well as air kerma for the scattered X rays.