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As a magnesium alloy, a small quantity of thorium can be used for its. hardening and lightweight properties, making it ideal for the aerospace industry.1 One problem. with thorium is its mildly radioactive nature, producing concerns over its safety and potential. harmful effects.
Thorium (Th) is a radioactive metallic element that, until the 1950âs, was known only by chemists and physicists. It is not abundant, but major supplies are in sands rich in monazite ((Ce,La, Nd,Th)PO4). Commercially, monazite is recovered as a by-product of the processing of titanium-bearing heavy-mineral sands.