Californium: The Element Named for a West Coast University

Californium (Cf, atomic number 98) is the chemical element named for the University of California system—specifically honoring the University of California, Berkeley, where it was first synthesized in 1950.

Discovery History

Researchers at UC Berkeley's Lawrence Berkeley National Laboratory (then the Radiation Laboratory) produced californium by bombarding curium-242 with alpha particles (helium nuclei) in the 60-inch cyclotron. The team—Stanley Thompson, Kenneth Street Jr., Albert Ghiorso, and Glenn Seaborg—identified the new element through its characteristic radioactive decay.

Significance

• Sixth transuranium element discovered (after neptunium, plutonium, americium, curium, berkelium)
• Named for the university and state where discovered, continuing the tradition of naming elements after discovery locations (like berkelium for Berkeley, americium for America)
• Practical applications: Neutron source for nuclear reactor startup, oil well logging, cancer therapy (brachytherapy), and portable metal detectors

Other UC-Named Elements

The University of California system has four elements named in its honor—more than any other institution:

• Berkelium (Bk, 97) - UC Berkeley
• Californium (Cf, 98) - UC System/California
• Lawrencium (Lr, 103) - Ernest O. Lawrence (Berkeley Lab founder)
• Seaborgium (Sg, 106) - Glenn Seaborg (Berkeley Nobel laureate)

Californium remains one of the few transuranium elements with measurable macroscopic quantities produced, making it uniquely valuable for scientific and industrial applications.