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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.
Selenium is still used in a few types of DC power surge protectors and one type of fluorescent quantum dot. Selenium salts are toxic in large amounts, but trace amounts are necessary for cellular function in many organisms, including all animals. Selenium is an ingredient in many multivitamins and other dietary supplements, including infant formula.