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Table 2 Number of decays expected in standard scan conditions and time used to acquire an equal amount of positron decays for each radionuclide.

From: Comparison of scandium-44 g with other PET radionuclides in pre-clinical PET phantom imaging

NuclidePositron annihilations in 1200 s for 3.7 MBqTime to acquire the same number of positron annihilations as 18F (s)
18F4.03 × 1091200
68Ga3.57 × 1091376
64Cu0.774 × 1096506
44gSc4.07 × 1091190