Thorium
A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.
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Subheadings:
Tree Number(s): D01.268.271.100.900, D01.268.556.850, D01.496.749.305.100.900, D01.552.020.889, D01.552.544.850
MeSH Unique ID: D013910
Registry Number: 60YU5MIG9W