The relatively long-lived positron emitters 64Cu (t1/2 = 12.7 h), 76Br (t1/2 = 16.2 h) and 124I (t1/2 = 4.18 d) are finding increasing applications in positron emission tomography (PET). For precise determination of their positron emission intensities, each radionuclide was prepared via a charged particle induced reaction in a “no-carrier-added” form and with high radionuclidic purity. It was then subjected to γ-ray and X-ray spectroscopy as well as to anticoincidence beta and γγ-coincidence counting. The positron emission intensities measured were: 64Cu (17.8 ± 0.4)%, 76Br (58.2 ± 1.9)% and 124I (22.0 ± 0.5)%. The intensity of the weak 1346 keV γ-ray emitted in the decay of 64Cu was determined as (0.54 ± 0.03)%. Some implications of the precisely determined nuclear data are discussed.
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