Californium
A man-made radioactive actinide with atomic symbol Cf, atomic number 98, and atomic weight 251. Its valence can be +2 or +3. Californium has medical use as a radiation source for radiotherapy.
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Subheadings:
Tree Number(s): D01.268.271.100.150, D01.268.556.156, D01.496.749.305.100.150, D01.552.020.200, D01.552.544.156
MeSH Unique ID: D002142
Registry Number: 975X05H15A