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Symbol Cf. A radioactive metallic transuranic element belonging to the actinoids; a.n. 98; mass number of the most stable isotope 251 (half-life about 700 years). Nine isotopes are known; californium–252 is an intense neutron source, which makes it useful in neutron activation analysis and potentially useful as a radiation source in medicine. The element was first produced by G. T. Seaborg (1912–99) and associates in 1950.

Subjects: Chemistry — Physics.

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