TheKSpectra of Element 61

Abstract

The $K_{\alpha 1}$, $K_{\alpha 2}$, $K_{\beta 1}$, and $K_{\beta 2}$ lines of the x-ray spectra of element 61 were obtained from 1.5 mg of sample of the chloride salt. The sample was fused on a copper target and bombarded with electrons from a 70-kv source. Wave-length measurements were made from a microphotometer tracing of the film. After one exposure of the sample, neodymium and samarium were added to the target and the spectrum of the three elements was recorded to show the position of element 61 in the periodic table.