Isotopes of calcium

Calcium isotopes (mainly Ca-42, Ca-44, Ca-46 and Ca-48) are used extensively in clinical research and mainly in nutritional studies. They are used to measure calcium absorption mainly in women and children. In adults, calcium deficiency is strongly related to increasing severity of osteoporosis. In children, calcium deficiency is primarily related to the development of rickets. Ca-48 has been used to bombard Pb and Bi targets in order to create super heavy elements. Calcium 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 calcium are listed (including any which occur naturally) below.
Isotope Atomic mass (ma/u) Natural abundance (atom %) Nuclear spin (I) Magnetic moment (μ/μN)
40Ca 39.9625906 (13) 96.941 (156) 0 0
42Ca 41.9586176 (13) 0.647 (23) 0 0
43Ca 42.9587662 (13) 0.135 (10) 7/2 -1.31727
44Ca 43.9554806 (14) 2.086 (110) 0 0
46Ca 45.953689 (4) 0.004 (3) 0 0
48Ca 47.952533 (4) 0.187 (21) 0 0

Isotopic abundances of Ca
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 calcium are listed above. This table gives information about some radiosotopes of calcium, 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
41Ca 40.9622783 102000 y EC to 41K 7/2 -1.595
45Ca 44.956186 162.7 d β- to 45Sc 7/2 -1.327
47Ca 46.954546 4.536 d β- to 47Sc 7/2 -1.38
49Ca 48.955673 8.72 m β- to 49Sc 3/2
50Ca 49.95752 14 s β- to 50Sc 0
51Ca 50.9615 10 s β- to 51Sc; β- + n to 50Sc 3/2
52Ca 51.9651 4.6 s β- to 52Sc

Sheffield ChemPuter isotope pattern calculator

You can use WebElements to calculate an isotope pattern for an arbitrary chemical formula:

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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 calcium

Common reference compound: CaCl2/D2O, 0.1 M.

Table of NMR-active nucleus propeties of calcium
  Isotope 1 Isotope 2 Isotope 3
Isotope 41Ca 43Ca
Natural abundance /% 0.135
Spin (I) 7/2
Frequency relative to 1H = 100 (MHz) 6.730029
Receptivity, DP, relative to 1H = 1.00 0.00000868
Receptivity, DC, relative to 13C = 1.00 0.0510
Magnetogyric ratio, γ (107 rad T-1 s-1) -1.803069
Magnetic moment, μ (μN) -1.494067
Nuclear quadrupole moment, Q/millibarn -40.8(8) -4.08
Line width factor, 1056l (m4) 2.3

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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calcium atomic number