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Production of 15O by Van de Graaff accelerator

A 10 cm3 gas target cell equipped with a 5 mu m thick molybdenum entrance window was filled with nitrogen at a pressure of 1.7 atm and bombarded with 5 MeV deuterons from the accelerator at a beam current of 8 mu A. After a ten minute (five half-life) bombardment, the gas was transferred to a counting chamber viewed by two sodium iodide scintillation counters, and the 15O yield was determined by counting the resulting positron activity using the gamma-gamma coincidence method. The yield of 15O was measured to be 30+or-6 mCi, corrected to the end of the bombardment.