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Radionuclide Dosimetric Data Sheets
Radium-228
Summary data
General
Classification
Isotope: Ra-228
Atomic number (Z): 88
Mass number (A): 228
Neutron number (N): 140
Radioactive decay
Decay modes: β-
Half-life: 5.75 [y]
Decay constant: 3.8200e-09 [1/s]
Daughters: Ac-228 (100.0%)
Radioactive daughters: Ac-228
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01319 [MeV]
Mean photon energy: 0.00306 [MeV]
Air kerma rate constant, Γ10: 3.847e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.847e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.113e-15 [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-:
2.113e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.903e-16
[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/Ra-228 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/Ra-228 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/Ra-228 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/Ra-228 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.95130e-05 |
6.365e+00 |
X-ray |
|
3.01410e-03 |
2.762e-02 |
X-ray |
|
1.35200e-02 |
1.565e-02 |
Gamma |
|
1.51500e-02 |
3.000e-02 |
Gamma |
|
1.55000e-02 |
1.000e-02 |
Gamma |
|
1.62000e-02 |
9.000e-02 |
Gamma |
|
3.22032e-03 |
3.000e-01 |
Beta |
|
6.48053e-03 |
2.000e-01 |
Beta |
|
9.94231e-03 |
4.000e-01 |
Beta |
|
1.00428e-02 |
1.000e-01 |
Beta |
|
3.12713e-05 |
1.486e+00 |
Auger electron |
|
1.29474e-04 |
1.686e+00 |
Auger electron |
|
1.89298e-04 |
9.920e-01 |
Auger electron |
|
4.85701e-04 |
4.322e-01 |
Auger electron |
|
1.24652e-03 |
1.317e-02 |
Auger electron |
|
2.33373e-03 |
4.668e-01 |
Auger electron |
|
2.37610e-03 |
7.338e-02 |
Conversion electron |
|
2.76610e-03 |
3.738e-01 |
Conversion electron |
|
2.77601e-03 |
8.247e-02 |
Auger electron |
|
6.28000e-03 |
2.662e-02 |
Conversion electron |
|
6.55200e-03 |
1.728e-02 |
Conversion electron |
|
6.67000e-03 |
1.262e-01 |
Conversion electron |
|
8.84610e-03 |
2.046e-02 |
Conversion electron |
|
9.61610e-03 |
7.165e-02 |
Conversion electron |
|
1.35200e-02 |
2.270e-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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