Abstract
Aqueous solutions of [ 13N]NH 3 were synthesized according to well-known methods using the 16O( p, α) 13N reaction under conditions rendering the smallest possible amount of nitrogen-contaminants. The specific activities and radiochemical yields were measured. Factors, affecting the specific activity of [ 13N]NH 3, were investigated using radio-ionchromatography. The achieved specific activities (GBq/ μmol) and radiochemical yields (GBq) of [ 13N]NH 3 were 14±2.8 and 0.3±0.1 (TiCl 3 method)∗, 590±200 and 5.4±1.1 (DeVarda's Alloy method), 5500±500 and 12.7±0.1 (ethanol method), and 6200±2700 and 2.8±0.3 (hydrogen method, 3 bar), respectively at 15 μA for 20 min irradiation (∗; 5 μA, 5 min irradiation). More than 70% of the N-13 generated with the hydrogen method was of the chemical form [ 13N]N 2.
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