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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 was once commonly used as the light source in gas mantles and as an alloying material, but these applications have declined due to concerns about its radioactivity. Thorium is still widely used as an alloying element in TIG welding electrodes (at a rate of 1â2% mix with tungsten).