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| Isotopes of Technetium |
 Notes
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| Technetium is one of three elements in the first 82 that have no stable isotopes. The other such elements are promethium and tungsten, although since the half-llife of tungsten is so long (2.09 x 1019 years) it is usually classed as being stable. |
 Notable Isotopes
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 95mTc [52 neutrons] |
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 Abundance: synthetic
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| Half life: 61 days [ Electron Capture ]
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| Decay Energy: ?MeV |
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| Decays to 95Mo.
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| Half life: 61 days [ Gamma Radiation ]
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| Decay Energy: 0.204, 0.582, 0.835MeV |
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| Decays to ?.
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| Half life: 61 days
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| Decay Energy: 0.0389eMeV |
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| Decays to 95Tc.
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| 96Tc [53 neutrons] |
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| Abundance: synthetic
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| Half life: 4.3 days [ Electron Capture ]
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| Decay Energy: ?MeV |
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| Decays to 96Mo.
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| Half life: 4.3 days [ Gamma Radiation ]
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| Decay Energy: 0.778, 0.849, 0.812MeV |
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| Decays to ?.
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| 97mTc [54 neutrons] |
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| Abundance: synthetic
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| Half life: 90 days
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| Decay Energy: 0.965eMeV |
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| Decays to 97Tc.
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| 97Tc [54 neutrons] |
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| Abundance: synthetic
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| Half life: 2.6 x 106 years [ Electron Capture ]
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| Decay Energy: ?MeV |
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| Decays to 97Mo.
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| 98Tc [55 neutrons] |
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| Abundance: synthetic
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| Half life: 4.2 x 106 years [ beta- ]
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| Decay Energy: 0.4MeV |
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| Decays to 98Ru.
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| Half life: 4.2 x 106 years [ Gamma Radiation ]
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| Decay Energy: 0.745, 0.652MeV |
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| 99mTc [56 neutrons] |
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| Abundance: trace
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| Half life: 6.01 hours
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| Decay Energy: 0.142, 0.002MeV |
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| Decays to 99Tc.
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| Half life: 6.01 hours [ Gamma Radiation ]
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| Decay Energy: 0.140MeV |
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| 99Tc [56 neutrons] |
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| Abundance: trace
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| Half life: 2.111 x 105 years [ beta- ]
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| Decay Energy: 0.294MeV |
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| Decays to 99Ru.
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