Abstract
[ 13N]NH 3 prepared by irradiating dilute aqueous ethanol with 10 MeV protons is contaminated with small amounts of [ 18F]fluoride and [ 13N]NO 2 −/NO 3 −. The content of 18F is negligible at end of bombardment but increases as a function of time due to the longer half-life of 18F. We developed a simple on-line purification method in which the irradiated water directly passes through a small anion exchange column. Both the radionuclidic impurity [ 18F]fluoride and the radiochemical impurities [ 13N]NO 3 −/NO 2 − are efficiently removed by this procedure which results in highly pure (>99.9%) [ 13N]NH 3 preparations.
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