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Isotopes of lutetium

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Naturally occurring lutetium (71Lu) is composed of one stable isotope 175Lu (97.40% natural abundance) and one long-lived radioisotope, 176Lu with a half-life of 37 billion years (2.60% natural abundance). Forty synthetic radioisotopes have been added from 149Lu to 190Lu, with the most stable being 174Lu with a half-life of 3.31 years and 173Lu with a half-life of 1.37 years. All of the remaining radioactive isotopes have half-lives that are less than 9 days, and the majority of these have half-lives that are less than half an hour. Of the meta states known for this element, the most stable are 177m3Lu (t1/2 160.4 days) and 174mLu (t1/2 142 days).

Quick facts Main isotopes, Decay ...

The primary decay mode before the most abundant stable isotope, 175Lu, is electron capture (with some alpha and positron emission), leading to ytterbium or less often thulium isotopes, and the primary mode after is beta emission giving hafnium isotopes.

All isotopes of lutetium are either radioactive or, for the lone stable isotope 175Lu, observationally stable, meaning that it is predicted to be radioactive (to alpha decay) but no decay has been observed.[4]

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List of isotopes

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More information Nuclide, Z ...
  1. [n 1]
    mLu – Excited nuclear isomer.
  2. [n 2]
    ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. [n 3]
    # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. [n 4]
    Bold half-life – nearly stable, half-life longer than age of universe.
  5. [n 5]
    # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  6. [n 6]
    Modes of decay:
    EC:Electron capture
    IT:Isomeric transition
    p:Proton emission
  7. [n 7]
    Bold symbol as daughter – Daughter product is stable.
  8. [n 8]
    ( ) spin value – Indicates spin with weak assignment arguments.
  9. [n 9]
    Order of ground state and isomer is uncertain.
  10. [N 10]
    Discovery of this isotope is disputed.
  11. [N 11]
    Believed to undergo α decay to 171Tm
  12. [N 12]
    primordial radionuclide
  13. [N 13]
    Used in lutetium-hafnium dating
  14. [N 14]
    Theoretically capable of electron capture to 176Yb[7] or α decay to 172Tm
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Lutetium-177

Main article: Lutetium (177Lu) chloride

Lutetium (177Lu) chloride, sold under the brand name Lumark among others, is used for radiolabeling other medicines, either as an anti-cancer therapy or for scintigraphy (medical radio-imaging). Its most common side effects are anaemia (low red blood cell counts), thrombocytopenia (low blood platelet counts), leucopenia (low white blood cell counts), lymphopenia (low levels of lymphocytes, a particular type of white blood cell), nausea (feeling sick), vomiting and mild and temporary hair loss.[10][11]

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See also

Daughter products other than lutetium

References

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