单词	cobalt 60
释义	cobalt 60 noun co·​balt 60 ˈkō-ˌbȯlt-ˈsik-stē  : a heavy radioactive isotope of cobalt of the mass number 60 produced in nuclear reactors and used as a source of gamma rays (as for radiotherapy) Example Sentences Recent Examples on the Web In Colorado, for instance, 27 buildings house scary-sounding elements such as cesium 137, cobalt 60, americium 241 and iridium 192. Sarah Scoles, Scientific American, 11 Mar. 2022 Given all that, replacing cobalt 60 machines does not always go well. Sarah Scoles, Scientific American, 11 Mar. 2022 Word History First Known Use 1946, in the meaning defined above Medical Definition cobalt 60 noun -ˈsik-stē  : a heavy radioactive isotope of cobalt having the mass number 60 produced in nuclear reactors and used as a source of gamma rays especially in place of radium (as in the treatment of cancer and in radiography) called also radiocobalt
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