CHOICE BETWEEN THE USE OF EXPERIMENTAL AND THEORETICAL VALUES OF L-SUBSHELL X-RAY-FLUORESCENCE CROSS-SECTIONS FOR VARIOUS APPLICATIONS

L x-ray fluorescence cross-sections in Au, Pb, Th and U at K conversio n x-rays of Cd and In mere measured using three different experimental arrangements. In contrast to the findings of Rao et al. that the meas ured values are consistently higher than the calculated values by 20-2 5%, the present results do not show any regular systematic trends indi cating any departure from theory. The deficiencies in their method of measurement are pointed out and the plausible reasons for the discrepa ncy that they reported are discussed.