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Radionuclide Dosimetric Data Sheets
Magnesium-28
Summary data
General
Classification
Isotope: Mg-28
Atomic number (Z): 12
Mass number (A): 28
Neutron number (N): 16
Radioactive decay
Decay modes: β-
Half-life: 20.91 [h]
Decay constant: 9.2059e-06 [1/s]
Daughters: Al-28 (100.0%)
Radioactive daughters: Al-28
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16099 [MeV]
Mean photon energy: 1.36996 [MeV]
Air kerma rate constant, Γ10: 5.038e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.038e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.579e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.579e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.195e-13
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Mg-28 DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Mg-28 Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Mg-28 Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Mg-28 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.10332e-06 |
1.247e+00 |
X-ray |
|
3.06400e-02 |
6.600e-01 |
Gamma |
|
4.00690e-01 |
3.660e-01 |
Gamma |
|
9.41450e-01 |
3.830e-01 |
Gamma |
|
1.34225e+00 |
5.260e-01 |
Gamma |
|
1.37289e+00 |
4.700e-02 |
Gamma |
|
1.58936e+00 |
4.200e-02 |
Gamma |
|
6.52092e-02 |
4.985e-02 |
Beta |
|
1.55903e-01 |
9.471e-01 |
Beta |
|
2.85013e-05 |
1.328e-01 |
Auger electron |
|
6.52477e-05 |
5.503e-01 |
Auger electron |
|
1.37132e-03 |
2.535e-01 |
Auger electron |
|
1.44735e-03 |
1.310e-02 |
Auger electron |
|
2.90901e-02 |
2.771e-01 |
Conversion electron |
|
3.05210e-02 |
1.930e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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