Isotopes of tantalum

Tantalum has only two isotopes and one of them, Ta-180, has one of the lowest natural abundances of all naturally occurring isotopes (0.012%). Ta-180 has only been produced in minute quantities and is very expensive. Ta-181 can be used for the production of W-178 which decays to Ta-178. Ta-178 emits low energy gamma rays which can be used for imaging purposes. Tantalum isotopes can be obtained from Trace Sciences International.

Naturally occurring isotopes

This table shows information about naturally occuring isotopes, their atomic masses, their natural abundances, their nuclear spins, and their magnetic moments. Further data for radioisotopes (radioactive isotopes) of tantalum are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
180Ta 179.947462 (4) 0.012 (2) 8
181Ta 180.947992 (3) 99.988 (2) 7/2 2.371

Isotopic abundances of Ta
In the above picture, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. This is not to be confused with the relative percentage isotope abundances which total 100% for all the naturally occurring isotopes.

Radiosotope data

Further data for naturally occuring isotopes of tantalum are listed above. This table gives information about some radiosotopes of tantalum, their masses, their half-lives, their modes of decay, their nuclear spins, and their nuclear magnetic moments.
Isotope Mass Half-life Mode of decay Nuclear spin Nuclear magnetic moment
177Ta 176.944472 2.356 d EC to 177Hf 7/2 2.25
178Ta 177.9458 9.29 m EC to 178Hf 1 2.74
179Ta 178.94593 1.8 y EC to 179Hf 7/2
180Ta 179.947466 8.15 h EC to 180Hf; β- to 180W 1
182Ta 181.950152 114.43 d β- to 182W 3 3.02
183Ta 182.951373 5.1 d β- to 183 W 7/2 2.36

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References

  1. Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. [Copyright 1998 IUPAC]
  2. For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute) Table of the Nuclides
  3. Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu in Quantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]

NMR Properties of tantalum

Common reference compound: KTaCl6/MeCN.

Table of NMR-active nucleus propeties of tantalum
  Isotope 1 Isotope 2 Isotope 3
Isotope 181Ta
Natural abundance /% 99.988
Spin (I) 7/2
Frequency relative to 1H = 100 (MHz) 11.989600
Receptivity, DP, relative to 1H = 1.00 0.0374
Receptivity, DC, relative to 13C = 1.00 214
Magnetogyric ratio, γ (107 rad T-1 s-1) 3.2438
Magnetic moment, μ (μN) 2.6879
Nuclear quadrupole moment, Q/millibarn 3170(20) and 3710(70) [Mössbauer state]
Line width factor, 1056l (m4) 1.5

References

  1. R.K. Harris in Encyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful to Professor Robin Harris (University of Durham, UK) who provided much of the NMR data, which are copyright 1996 IUPAC, adapted from his contribution contained within this reference.
  2. J. Mason in Multinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
  3. P. Pyykkö, Mol. Phys., 2008, 106, 1965-1974.
  4. P. Pyykkö, Mol. Phys., 2001, 99, 1617-1629.
  5. P. Pyykkö, Z. Naturforsch., 1992, 47a, 189. I am grateful to Professor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
  6. D.R. Lide, (ed.), CRC Handbook of Chemistry and Physics 1999-2000 : A Ready-Reference Book of Chemical and Physical Data (CRC Handbook of Chemistry and Physics, CRC Press, Boca Raton, Florida, USA, 79th edition, 1998.
  7. P. Pyykkö, personal communication, 1998, 204, 2008, 2010.
  8. The isotopic abundances are extracted from the naturally occurring isotopes section within WebElements.

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tantalum atomic number