Several Chromium isotopes are used for medical applications. Cr-50 is used for the production of the radioisotope Cr-51 which is used for measuring blood volume and red blood cell survival. Cr-53 and Cr-54 are used for the study of chromium metabolism and studies into (adult) diabetes.
Naturally occurring isotopes
| Isotope | Mass / Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 50Cr | 49.9460464 (17) | 4.345 (13) | 0 | |
| 52Cr | 51.9405098 (17) | 83.789 (18) | 0 | |
| 53Cr | 52.9406513 (17) | 9.501 (17) | 3/2 | -0.47454 |
| 54Cr | 53.9388825 (17) | 2.365 (7) | 0 |
Radiosotope data
| Isotope | Mass / Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 48Cr | 47.95404 | 21.6 h | EC to48V | ||
| 49Cr | 48.951341 | 42.3 m | EC to49V | 5/2 | 0.476 |
| 51Cr | 50.944772 | 27.70 d | EC to51V | 7/2 | -0.934 |
| 55Cr | 54.940844 | 3.497 m | β- to55Mn | 3/2 | |
| 56Cr | 55.94065 | 5.9 m | β- to56Mn | 0 |
References
- Naturally occurring isotope abundances: Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry inIsotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998,70, 217. [Copyright 1998 IUPAC]
- For further information about radioisotopes see Jonghwa Chang's (Korea Atomic Energy Research Institute)Table of the Nuclides
- Masses, nuclear spins, and magnetic moments: I. Mills, T. Cvitas, K. Homann, N. Kallay, and K. Kuchitsu inQuantities, Units and Symbols in Physical Chemistry, Blackwell Scientific Publications, Oxford, UK, 1988. [Copyright 1988 IUPAC]
NMR Properties of chromium
Common reference compound: K2CrO4/D2O, saturated.
| Isotope 1 | Isotope 2 | Isotope 3 | |
|---|---|---|---|
| Isotope | 53Cr | ||
| Natural abundance/% | 9.501 | ||
| Spin (I) | 3/2 | ||
| Frequency relative to1H = 100 (MHz) | 5.652496 | ||
| Receptivity, DP, relative to1H = 1.00 | 0.0000863 | ||
| Receptivity, DC, relative to13C = 1.00 | 0.507 | ||
| Magnetogyric ratio, γ (107 rad T‑1 s-1) | -1.5152 | ||
| Magnetic moment, μ (μN) | -0.61263 | ||
| Nuclear quadrupole moment, Q/millibarn | -150(50) | ||
| Line width factor, 1056 l (m4) | 300 |
References
- R.K. Harris inEncyclopedia of Nuclear Magnetic Resonance, D.M. Granty and R.K. Harris, (eds.), vol. 5, John Wiley & Sons, Chichester, UK, 1996. I am grateful toProfessor 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.
- J. Mason inMultinuclear NMR, Plenum Press, New York, USA, 1987. Where given, data for certain radioactive nuclei are from this reference.
- P. Pyykkö,Mol. Phys., 2008,106, 1965-1974.
- P. Pyykkö,Mol. Phys., 2001,99, 1617-1629.
- P. Pyykkö,Z. Naturforsch., 1992,47a, 189. I am grateful toProfessor Pekka Pyykkö (University of Helsinki, Finland) who provided the nuclear quadrupole moment data in this and the following two references.
- 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.
- P. Pyykkö,personal communication, 1998, 204, 2008, 2010.