Abstract
In this work, an alternative method to determine the U interference factor for 153Sm as a function of the decay time was studied aiming to take into account the time dependence arising from the spectral interference of 239Pu X-rays. An experimental interference factor and a theoretical equation dependent on the epithermal and thermal neutron fluxes and on the decay time were also proposed. These interference factors obtained from both, experimentally and using the theoretical equation were applied on the correction of the Sm concentration in the BCR-667 certified reference material with good results, showing the reliability of these correction factors.
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