“…Several methods were reported in the literature for the activity standardization of 68 Ge/ 68 Ga (Schönfeld et al, 1994;Grigorescu et al, 2004;Zimmerman et al, 2008;Kulkarni et al, 2017). Because of the volatility of germanium, primary methods based on liquid scintillation (LS) can be preferred to those using dried sources.…”