Absolute values of K X-ray fluorescence (XRF) cross-sections have been calculated for elements 11 < Z < 69 at three excitation energies corresponding to Mn, Ag and Te K X-rays from "Fe, lo9Cd and "' I radioisotopes respectively and the fourth energy corresponding to the 59.60 keV y-ray from 241Am. Measurements were also made for these cross-sections for ten elements with 18 < 2 < 48 at two excitation energies from Io9Cd and 1251 radioisotopes. The measured values are compared with those obtained from theoretical considerations and a good agreement is found.

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Absolute values of x-ray fluorescence (XRF) cross-sections for L a lines have been calculated for all the elements with 47 S 2 G 92 at two exciting energies corresponding to Ag and Te K x-rays from '"Cd and '%I radioisotopes, respectively. The effect of hole transfer within L subshells is also included when calculating the cross-sections. Experimental measurements were carried out for La, L, and L,,,, x-ray fluorescence cross-sections for some of the elements ranging from Ho to c' using exciter sources of lo9Cd and '*'I. Average L shell fluorescence yields were also obtained using the measured values of total L shell x-ray fluorescence cross-sections and the theoretical values of photoelectric cross-sections.

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