Measured values of the relative intensities of several $K$-fluorescent x rays are reported for 28 elements ranging from calcium through plutonium. Solid-state Si(Li) and Ge(Li) spectrometers and a Bragg-diffraction spectrometer were used in making the measurements. Fluorescence was excited in thin samples by higher-energy x rays. Corrections were made to the measured relative intensities for sample absorption, air absorption, and spectrometer efficiency. The accuracy of most of the measurements is ± 2 to 5%. The results are compared with those of other experimenters and with the Scofield calculations.

• Received 25 June 1971

DOI:https://doi.org/10.1103/PhysRevA.4.1745