Effect of polymer adhesive in positron source for positron annihilation lifetime spectroscopy (PALS)

This study identified the cause of the minor lifetime component and the effect of the polymer adhesive in the positron source on positron annihilation lifetime spectroscopy. Three types of positron sources with different concentrations of the polymer adhesive were compared using nickel (Ni) and adhesive specimens. The unnecessary components of the positron lifetime due to the polymer adhesive could be eliminated by a source correction of approximately 20.8%. The results showed that minimizing the amount of polymer adhesive in the positron source is recommended, or a detailed source correction is required, to analyze the positron lifetimes accurately.