tritium

tritium
[ˈtrɪtɪəm]
noun
  1. [mass noun](Chemistry)a radioactive isotope of hydrogen with a mass approximately three times that of the usual isotope(Symbol: T)
    (化)(氢的放射性同位素)氚(符号:T)
  2. Discovered in 1934, tritium has two neutrons as well as a proton in the nucleus. It occurs in minute traces in nature and can be made artificially from lithium or deuterium in nuclear reactors; it is used as a fuel in thermonuclear bombs
语源
  1. 1930s: from modern Latin, from Greek tritos 'third'
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