Production of 11C and 7Be by TRIGA-II Research Reactor

概要

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11C has been produced by irradiating for 30 min in the pneumatic tube of a MICA-II research reactor about 700 mg of metaboric acid (HBO2), using the 11B(p, n)11C reaction initiated by neutron-hydrogen recoil. The fast neutron flux (>1 MeV) was 9 X 1011 n/cm2 sec. The 11C produced was separated from the irradiated target by distillation of CO2. The yield of 11C at the end of irradiation was 0.27 μCi. 7Be also was produced by irradiating for 15 hr 1 g of lithium hydroxide in the central experimental tube of the reactor, through the 7Li(p, n)7Be reaction initiated by neutron-hydrogen recoil. The fast neutron flux was 2.2 x 1012 n/cm2 • sec. Separation of carrier-free 7Be from the irradiated target was obtained by co-precipitation with ferric hydroxide. The yield of 7Be was 0.2 μCi. For determining the influence on the 'Be yield brought by differences in the chemical com-position of target, irradiations were carried out on lithium compounds containing hydrogen, such as lithium hydroxide, lithium hydroxide hydrate, lithium acetate and lithium citrate. Among these four lithium compounds, lithium hydroxide provided the highest yield of 7Be per gram of target.
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