Primary radioactivity standardization and gamma intensities determination of 124Sb

A solution containing 124Sb was primarily standardized by the 4πβ−γ coincidence and anticoincidence extrapolation methods in the frame of the EUROMET 907 international comparison organized by Laboratoire National Henri Bequerel (LNHB)/France, in 2007. The main purposes of this exercise are the improvement in the uncertainties on the gamma-ray emission intensities and they clarify the discrepancies verified among the intensity values for many weak gamma rays reported in the literature. In this work the results of the activity obtained were used to determine the absolute and relative gamma-ray intensities using a planar and coaxial HPGe detectors calibrated by 152Eu and 116mHo multi-gamma standard sources covering the energy range from 20 to 1408 keV. Additionally the half-life of 124Sb was determined following the decay of a solution of 124Sb contained in a glass ampoule over a period of three half-lives using two 4πγ ionization chambers.