Wilhelm, Harley A. Formerly, Energy and Mineral Resources Research Institute and Ames Laboratory of U.S. Department of Energy; Iowa State University, Ames, Iowa.
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A chemical element, Th, atomic number 90. Thorium is a member of the actinide series of elements. It is radioactive with a half-life of about 1.4 × 1010 years. See also: Periodic table
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