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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 is a naturally-occurring radioactive metal found at very low levels in soil, rocks, and water. It has several different isotopes, both natural and man-made, all of which are radioactive. The most common form of thorium is thorium -232, found naturally. Th-232 with a half-life of 14.05 billion years, which represents all but a trace of naturally occurring thorium. 2  Th-230 with a half-life of 75,380 years. 3  It occurs as the daughter product of 238U decay.