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Actinium is a radioactive chemical element with the symbol Ac and atomic number 89. It is a silvery-white metal that glows faintly in the dark due to its radioactivity and is found in trace amounts in uranium and thorium ores. Discovered in 1899, actinium is primarily used in neutron sources and research, as well as in targeted alpha-particle therapy for cancer treatment. Due to its radioactivity, handling actinium requires special precautions to ensure safety.
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