Californium (element symbol Cf, atomic number 98) is a completely synthetic, highly radioactive transuranium element that does not occur in nature. It was first produced in 1950 by researchers at the University of California, Berkeley, by bombarding the element curium with alpha particles. Key Characteristics Radioactivity and Half-Life: Its most stable isotope, Californium-251, has a half-life of approximately 900 years. However, the isotope most frequently used in practice is Californium-252 (
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