Example image of eyePlorer eyePlorer map for 'Californium': Atomic number Chemical element Metal Radioactive decay Transuranium element Alpha particle Curium Helium Ion Albert Ghiorso Glenn T. Seaborg Timeline of chemical elements discoveries University of California, Berkeley California Dysprosium Cyclotron Neutron Materials Testing Reactor High Flux Isotope Reactor Savannah River Site Dimitrovgrad, Russia Research Institute of Atomic Reactors 1958 US–UK Mutual Defence Agreement United Kingdom Half-life Radionuclide Atomic mass unit Atomic weight Spontaneous fission Supernova Einsteinium Ivy Mike Nuclear fallout Teller–Ulam design United States Microgram Berkelium Beta decay Nuclear reactor technology Chemical compound Aqueous solution Neutron capture Alpha decay Nuclear fission Uranium-238 Neutron cross-section Isotopes of curium Neutron radiation Beta particle Gamma ray