Browsing by Author "Robson, J"

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    Absolute activity measurements of molybdenum 99 and 4π-γ ion chamber measurements of technetium 99m and of molybdenum 99 with ingrown technetium 99m
    (Australian Atomic Energy Commission, 1967-02) Lowenthal, GC; Robson, J; Deshpande, R
    The activity of molybdenum 99 freshly separated from technetium is absolutely measured to ± 1.8 per cent, by 4πв-γ coincidence counting. Internal conversion effects are allowed for and the completeness of the separation is checked from the growth rate of technetium 99m activity as measured in a 4П gamma ionisation chamber. The chamber has been calibrated for molybdenum 99 with ingrown technetium 99m and for pure technetium 99m and serves for routine activity measurements of solutions of these nuclides to an accuracy of ± 3 per cent.
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    Improved distillation separation for the production of fluorine-18 from reactor irradiated lithium carbonate
    (Australian Atomic Energy Commission, 1974-05) Robson, J; Sorby, PJ
    A process is described whereby iaF of pharmaceutical quality can be rapidly isolated from irradiated lithium carbonate by distillation under controlled conditions. By this method a consistent, high yield of I8F can be obtained in a solution containing reproducible concentrations of sodium sulphate and carbonate.
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    The preparation of magnesium-28 by the irradiation in HIFAR of mixtures containing compounds of lithium-6 and magnesium-26
    (Australian Atomic Energy Commission, 1974-04) Robson, J; Sorby, PJ
    An examination of the specific activities and yields of 28Mg obtained by the irradiation in HIFAR of a number of mixtures of lithium carbonate with either magnesium carbonate or magnesium oxide showed that up to 0.25 mCi of 28Mg at approximately 6 mCi g-1 of magnesium could be obtained. A separation procedure based on the precipitation of magnesium hydroxide is described and the results of a number of preparations by this method are presented.
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    Production of fluorine-18 from reactor-irradiated lithium compounds
    (Australian Atomic Energy Commission, 1968-02) Robson, J
    Existing methods of separating fluorine-18 produced in reactor-irradiated lithium compounds are reviewed. Direct distillation of fluorine-18 from acidified lithium solutions and absorption with the minimum of condensation is shown to be the most satisfactory process for low activities. For remote operation the fluorine-18 is separated by absorption on a column of hydrous zirconium oxide followed by elution on passage of an alkaline solution to hydrolyse the complex fluoride. A lower recovery level for fluorine-18 on zirconium oxide is compensated by the speed at which this separation can be carried out. The irradiation of lithium hydroxide is recommended for fluorine-18 production. A procedure is described in detail for the separation of fluorine-18.
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    The synthesis of 4-14C-pyridine-2,6-dicarboxylic acid
    (Australian Atomic Energy Commission, 1978-02) Robson, J; Sorby, PJ
    Dipicolinic acid (pyridine-2,6-dicarboxylic acid), labelled with l4C, has been synthesised, on a miniature scale, starting from formal-dehyde-[14C]. The radioactive label was incorporated into the '4' position of the pyridine ring to prevent possible loss of label owing to decarboxylation during experiments. The compound was intended for use in the localisation of dipicolinic acid in bacterial spores.