单词	californium
释义	californium noun cal·​i·​for·​ni·​um ˌka-lə-ˈfȯr-nē-əm  : a radioactive chemical element with atomic number 98 that is produced artificially from the decay of berkelium and that is used chiefly as a neutron source in radiography and to start nuclear reactors see Chemical Elements Table Example Sentences Recent Examples on the Web But the chase for 120 is on hold until researchers obtain the amount of californium—a rare element produced in high-flux nuclear reactors—needed for 120’s target. Daniel Clery, Science | AAAS, 12 Feb. 2021 Word History Etymology New Latin, from California, U.S. First Known Use 1950, in the meaning defined above Medical Definition californium noun cal·​i·​for·​ni·​um ˌkal-ə-ˈfȯr-nē-əm  : an artificially prepared radioactive element discovered by bombarding an isotope of curium with alpha particles —symbol Cf see Chemical Elements Table
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