The determination of the oxygen content in high purity gallium was performed by 18F producing 3He induced nuclear reactions. The 16O(3He, p)18F and 16O(3He, n)18Ne18F reactions were chosen taking into account their 10 considerable cross section and the half-life of the produced positron emitter isotope. The samples were prepared under nitrogen atmosphere to avoid further oxidation. 6.5 MeV 3He beam was used for irradiation with a beam current of less than 100 nA. To avoid melting the samples were frozen during the irradiation. A well defined surface layer of the activated samples was removed, and the 511 keV annihilation radiation was measured by HpGe gamma-spectrometry. Half-life measurement was also applied to separate the 18F activity from the produced other positron emitter isotopes. The oxygen concentration of the samples was between 5 and 100 μg/g.
ASJC Scopus subject areas
- Nuclear and High Energy Physics