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[en] Reagent grade molybdenum trioxide used as a target material for the preparation of Tc-99m pharmaceuticals contains trace amounts of rhenium. A simple charcoal adsorptions process has been developed to remove rhenium selectively from molybdenum before neutron irradiation. Details are given of the design and operation of a pilot plant in which 17 kg of molybdenum trioxide was produced having a rhenium content of less than 1 x 10-6 μg g-1. Although contamination of the Tc-99m by inactive rhenium and 188Re was effectively eliminated, 188Re resulting from the irradiation of tungsten impurity in the molybdenum trioxide target was still present
Source
Dec 1985; 10 p; ISBN 0 642 59819 3; 