Abstract
A spectrographic method for the estimation of some rare earths (Gd, Sm, Dy, Er and Ce) in plutonium samples is described. The rare earths were separated from 100 mg of plutonium by extracting plutonium with trilaurylamine. After concentration of the solution, the spectrum was photographed on a Hilger large quartz spectrograph, with scandium as internal standard. The estimation ranges are Gd 10–100 p.p.m., Sm 50–300 p.p.m., Dy 5–100 p.p.m., Er 5–200 p.p.m. and Ce 100–600 p.p.m. The overall standard deviation is 14%. The method is applicable to samples containing calcium and iron upto 1000 p.p.m. The resolving power and line interferences are discussed.
Published Version
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