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Solutions containing the potential radiotherapy radionuclide 177 Lu have been standardized at the National Institute of Standards and Technology (NIST) by 4πβ liquid scintillation (LS) counting with 3 H-standard efficiency tracing using the CIEMAT/NIST method. Confirmatory measurements were made with 4π NaI(Tl) γ-ray spectrometry. Activity determinations were made on 4 solutions...