Methods of producing radionuclides for spectrometric gamma-ray sources and their standardization: Pt. 2

The radionuclide 152Eu was produced by irradiating 151Eu 2O3 or 151EuCl3 enriched to 98.9% with thermal neutrons. 152Eu was separated from rare-earth impurities by extraction chromatography on a column using 0.6 M nitric acid eluent. The specific activity of the 152Eu was 1-10 Ci/g of Eu. The impurity of the 154Eu did not exceed 0.1%. The activity standardization of 152Eu was carried out by extrapolation of 4π(β, e, x)-γ coincidences. The relative γ-ray intensities for 28 γ-ray energies emitted in 152Eu decay have been measured. (author)