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Table 1 Experimental measurements of gamma counter efficiency (mean ± SD) for 18 F and 68 Ge/ 68 Ga

From: Performance assessment of a NaI(Tl) gamma counter for PET applications with methods for improved quantitative accuracy and greater standardization

Isotope Efficiency (%) Positron fraction Efficiency (%)/positron fraction
18F 34.4 ± 0.18 0.97 35.5 ± 0.18
68Ge/68Ga 30.1 ± 0.07 0.89 33.8 ± 0.07
  1. Both isotopes were measured using a 409- to 613-keV energy window.