Lα/LlX-ray intensity ratios for elements in the region 55⩽Z⩽80

Abstract
L alpha /Ll X-ray intensity ratios are measured in 19 elements in the region 55238Pu source is used to provide the excitation while a high-resolution Si(Li) detector connected to a 4 kbyte multichannel analyser and a microprocessor is used for the detection and measurement of X-ray intensities. The results show agreement with the theoretical predictions of Scofield (1969).