tech·ne·tium /tɛkˈniʃ(i)əm/
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 tech·ne·tium /tɛkˈnɪʃ(ɪ)əm/ 名詞
 鎝


 technetium
      n : a crystalline metallic element not found in nature; occurs
          as one of the fission products of uranium [syn: Tc, {atomic
          number 43]


 technetium
 Symbol: Tc
 Atomic number: 43
 Atomic weight: (98)
 Radioactive metallic transition element. Can be detected in some stars and
 the fission products of uranium. First made by Perrier and Segre by
 bombarding molybdenum with deutrons, giving them Tc-97. Tc-99 is the most
 stable isotope with a half-life of 2.6*10^6 years. Sixteen isotopes are
 known. Organic technetium compounds are used in bone imaging. Chemical
 properties are intermediate between rhenium and manganese.