2 definitions found From WordNet (r) 2.0 [wn]: californium noun: a radioactive transuranic element; discovered by bombarding curium with alpha particles [syn: {Cf}, {atomic number 98}] From Elements database 20001107 [elements]: californium Symbol: Cf Atomic number: 98 Atomic weight: (249) Radioactive metallic transuranic element. Belongs to actinoid series. Cf-251 has a half life of about 700 years. Nine isotopes are known. Cf-252 is an intense {neutron} source, which makes it an intense {neutron} source and gives it a use in {neutron} activation analysis and a possible use as a radiation source in medicine. First produced by Glenn T. Seaborg and associates in 1950.

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