Gallium-69
Properties and data of the isotope 69Ga.
Gallium-69 is a stable isotope of the chemical element gallium, comprising 60.1 % of terrestrial gallium deposits. The atomic nucleus of this nuclide contains 38 neutrons in its atomic nucleus in addition to the element-specific 31 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 69.
Gallium-69 was discovered - according to a report from 1923 [1] - during the mass spectrometric analysis of Gallium trifluoride.
See also: List of individual Gallium isotopes (and general data sources).
General data
Name of the isotope:Gallium-69; Ga-69Symbol:69Ga or 6931GaMass number A:69 (= number of nucleons)Atomic number Z:31 (= number of protons)Neutrons N:38Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.2258064516129 (= neutron-proton ratio)Neutron excess (N-Z):7Isotopic mass:68.9255735(13) u (atomic weight of Gallium-69)Nuclide mass:68.9085681 u (calculated nuclear mass without electrons)Mass excess:-69.32784 MeVMass defect:0.6462693 u (per nucleus)Nuclear binding energy:601.99597533 MeV (per nucleus)
8.72457935 MeV (average binding energy per nucleon)Separation energy:SN = 10.3131(19) MeV (first neutron)
SP = 6.6096(14) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = +2.01502(6)Charge radius:3.9973(17) femtometer fmYear of discovery:1923
Parent Nuclides
Direct parent isotopes are: 69Ge, 69Zn.
Occurrence
Comparison of the natural Gallium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
| | Atomic Mass ma | Quantity | Half-life | Spin |
|---|
Gallium
Isotopic mixture | 69.723 u | 100 % | | |
| Isotope 69Ga | 68.9255735(13) u | 60.108(50) % | stable | 3/2- |
| Isotope 71Ga | 70.9247026(9) u | 39.892(50) % | stable | 3/2- |
NMR data
Nuclear magnetic properties and parameters of the NMR active Nuclide 69Ga
Isotope:69Ga-NMRQuantity:60.108(50) %Spin:3/2-Nuclearmagnetic moment
μ/μN:+2.01502(6)Gyromagnetic ratio γ:6.438855 · 107 rad T-1 s-1
10.24776 MHz T-1Nuclear g-factor:gl = 1.3433466666667Quadrupole moment Q:+0.171(2) barn (100 fm2)Line width parameter (factor):l = 389.88 fm4Resonance frequency:v0 = 10.2478 MHz at 1 TRelative Sensitivity:[related to 1H = 1.000]:
0.06971 (H0 = const.)
1.2035 (v0 = const.)
0.0419 (at natural abundance)
relative receptivity as compared to 13C:
246 (at natural abundance)
409 (enriched)Reference compound:
(conditions)1.1 molar gallium nitrate solution Ga(NO3)3 in deuterium oxide D2O.Frequency ratio:Ξ(69Ga) = 24.001354 % [based on the reference substance]Chemical shift range:ca. 1440 ppm [-710 to 730]
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 69) with Gallium-69. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 38 | Isobar A = 69 |
|---|
| 19 | 57K | |
| 20 | 58Ca | |
| 21 | 59Sc | |
| 22 | 60Ti | |
| 23 | 61V | |
| 24 | 62Cr | |
| 25 | 63Mn | 69Mn |
| 26 | 64Fe | 69Fe |
| 27 | 65Co | 69Co |
| 28 | 66Ni | 69Ni |
| 29 | 67Cu | 69Cu |
| 30 | 68Zn | 69Zn |
| 31 | 69Ga | 69Ga |
| 32 | 70Ge | 69Ge |
| 33 | 71As | 69As |
| 34 | 72Se | 69Se |
| 35 | 73Br | 69Br |
| 36 | 74Kr | 69Kr |
| 37 | 75Rb | |
| 38 | 76Sr | |
| 39 | 77Y | |
| 40 | 78Zr | |
External data and identifiers
Literature and References
[1] - F. W. Aston:
Further Determinations of the Constitution of the Elements by the Method of Accelerated Anode Rays.
In: Nature, 112, (1923), DOI 10.1038/112449a0.
Last update: 2026-01-21
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