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SummaryA molybdenum-doped sodium tungstate phase (Mo-HTB) and a porous, granular polyacrylonitrile composite variant (PAN-Mo-HTB) have been shown to effectively remove polonium-210 and lead-210 from concentrated sulphuric acid solutions (1–8 M) and a copper electrowinning electrolyte. Both forms of the exchanger were characterised by high polonium-210 and lead-210 distribution coefficients and very good selectivity for polonium-210 and lead-210 over divalent copper and iron.

Many ores contain low levels of thorium. When these ores are processed, the associated radioactivity can be found in mineral concentrates, intermediates and final products. There is an incentive for industries to remove radioactivity from mineral products to allow the movement and sale of these materials, both nationally and internationally, without the need for licensing. Control of thorium in various products involves the development and optimisation of process steps to be able to meet product specifications. The Australian Nuclear Science and Technology Organisation (ANSTO) has undertaken a range of R & D programmes targeting the treatment of thorium-bearing minerals. This paper discusses the application of a microprobe technique for siting radioactivity in zircon and ilmenite and the problems experienced in measuring the concentrations in solid rare earth products.

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