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technetium-99
Sign in to saveAlso known as Tc-99, 99Tc
Technetium-99 (99Tc) is an isotope of technetium that decays with a half-life of 211,000 years to stable ruthenium-99, emitting beta particles, but effectively no gamma rays. It is the most significant long-lived fission product of uranium fission, and the largest single contributor to the long-lived radioactivity of nuclear waste. Technetium-99 has a fission product yield of 6.0507% for thermal neutron fission of uranium-235.
Chemical data
- Formula
- Tc
- Molecular weight
- 98.90625 g/mol
- IUPAC name
- technetium-99
- SMILES
- [99Tc]
- InChIKey
- GKLVYJBZJHMRIY-OUBTZVSYSA-N
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem
Wikidata facts
- Instance of
- isotope of technetium
- Subclass of
- technetium
- Part of
- period 5
- Mass
- 98.906249678
Show 9 more facts
- atomic number
- 43
- neutron number
- 56
- half-life
- 211100.0
- spin quantum number
- 4.5
- parity quantum number
- 1
- canonical SMILES
- [Tc]
- chemical formula
- Tc
- mass excess
- -87327.862
- binding energy
- 852747.39
Sources (9)
via Wikidata · CC0
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Encyclopedic overview
8 sectionsContents
- Radiation
- Role in nuclear waste
- Releases
- In the environment
- Separation of technetium-99
- Transmutation of technetium to stable ruthenium-100
- See also
- References
Technetium-99 (99Tc) is an isotope of technetium that decays with a half-life of 211,000 years to stable ruthenium-99, emitting beta particles, but effectively no gamma rays. It is the most significant long-lived fission product of uranium fission, and the largest single contributor to the long-lived radioactivity of nuclear waste. Technetium-99 has a fission product yield of 6.0507% for thermal neutron fission of uranium-235.
The metastable technetium-99m (99mTc) is a short-lived (half-life about 6 hours) nuclear isomer used in nuclear medicine, produced from molybdenum-99. It decays by isomeric transition to technetium-99, a desirable characteristic, since the very long half-life and type of decay of technetium-99 imposes little further radiation burden on the body.
Excerpted from Wikipedia’s “technetium-99” article, available under the CC BY-SA 4.0 licence.
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