Standardization of ¹⁴²Pr activity concentration

¹⁴²Pr (praseodymium-142), a potential radionuclide for brachytherapy, was produced after irradiating high purity natural Pr₂O₃ powder in a research reactor. The irradiated powder was then dissolved in acids and diluted for measurement. Several radioactivity measurement methods were used in the standardization of ¹⁴²Pr radionuclide. This work reports the results of standardization of ¹⁴²Pr with CIEMAT/NIST efficiency tracing method, gamma spectrometry and a calibrated ionization chamber. The activity measured from different standardization methods are compatible with each other within the uncertainty limits. The CIEMAT/NIST efficiency tracing method gives the lowest uncertainty and is a reliable method for the standardization of this radionuclide.