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Radionuclide Dosimetric Data Sheets
Radium-227
Summary data
General
Classification
Isotope: Ra-227
Atomic number (Z): 88
Mass number (A): 227
Neutron number (N): 139
Radioactive decay
Decay modes: β-
Half-life: 42.2 [m]
Decay constant: 2.7375e-04 [1/s]
Daughters: Ac-227 (100.0%)
Radioactive daughters: Ac-227
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.45106 [MeV]
Mean photon energy: 0.15083 [MeV]
Air kerma rate constant, Γ10: 1.911e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.911e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.227e-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-:
7.227e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.417e-14
[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-227 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-227 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-227 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-227 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.95349e-05 |
1.761e+01 |
X-ray |
|
2.98376e-03 |
8.833e-02 |
X-ray |
|
1.09087e-02 |
1.172e-02 |
X-ray |
|
1.25034e-02 |
1.975e-02 |
X-ray |
|
1.26589e-02 |
1.736e-01 |
X-ray |
|
1.51933e-02 |
1.329e-02 |
X-ray |
|
1.52434e-02 |
3.557e-02 |
X-ray |
|
1.57834e-02 |
1.112e-01 |
X-ray |
|
1.59441e-02 |
1.247e-02 |
X-ray |
|
1.84875e-02 |
2.447e-02 |
X-ray |
|
2.73700e-02 |
1.566e-01 |
Gamma |
|
8.80271e-02 |
3.554e-02 |
X-ray |
|
9.13071e-02 |
5.775e-02 |
X-ray |
|
1.03286e-01 |
1.285e-02 |
X-ray |
|
2.58300e-01 |
1.800e-02 |
Gamma |
|
2.77390e-01 |
2.610e-02 |
Gamma |
|
2.83680e-01 |
3.060e-02 |
Gamma |
|
3.00090e-01 |
4.590e-02 |
Gamma |
|
3.02680e-01 |
4.320e-02 |
Gamma |
|
3.30080e-01 |
2.700e-02 |
Gamma |
|
4.07970e-01 |
2.160e-02 |
Gamma |
|
4.86980e-01 |
2.250e-02 |
Gamma |
|
5.16200e-01 |
1.350e-02 |
Gamma |
|
6.11400e-01 |
1.170e-02 |
Gamma |
|
2.37317e-01 |
1.910e-02 |
Beta |
|
2.54619e-01 |
2.865e-02 |
Beta |
|
2.59335e-01 |
1.910e-02 |
Beta |
|
2.83250e-01 |
2.865e-02 |
Beta |
|
3.12992e-01 |
7.641e-02 |
Beta |
|
3.22106e-01 |
1.051e-01 |
Beta |
|
3.31572e-01 |
3.820e-02 |
Beta |
|
3.43406e-01 |
1.910e-02 |
Beta |
|
4.02068e-01 |
1.910e-02 |
Beta |
|
4.29979e-01 |
2.674e-01 |
Beta |
|
4.37354e-01 |
3.438e-01 |
Beta |
|
3.11140e-05 |
4.058e+00 |
Auger electron |
|
1.28060e-04 |
4.737e+00 |
Auger electron |
|
1.43202e-04 |
2.413e-02 |
Auger electron |
|
1.88211e-04 |
2.648e+00 |
Auger electron |
|
5.18937e-04 |
9.099e-01 |
Auger electron |
|
6.16999e-04 |
1.025e-02 |
Conversion electron |
|
1.30893e-03 |
2.555e-01 |
Auger electron |
|
2.27913e-03 |
1.453e+00 |
Auger electron |
|
2.68359e-03 |
2.438e-01 |
Auger electron |
|
3.24667e-03 |
1.403e-02 |
Auger electron |
|
5.05200e-03 |
5.099e-02 |
Conversion electron |
|
7.52200e-03 |
1.118e-01 |
Conversion electron |
|
8.20700e-03 |
1.807e-01 |
Conversion electron |
|
9.53908e-03 |
3.209e-01 |
Auger electron |
|
1.01020e-02 |
2.718e-02 |
Conversion electron |
|
1.07870e-02 |
2.207e-02 |
Conversion electron |
|
1.14870e-02 |
2.333e-01 |
Conversion electron |
|
1.25660e-02 |
1.575e-01 |
Auger electron |
|
1.40670e-02 |
1.949e-02 |
Conversion electron |
|
1.50961e-02 |
2.558e-01 |
Conversion electron |
|
1.56282e-02 |
1.829e-02 |
Auger electron |
|
1.90000e-02 |
9.011e-02 |
Conversion electron |
|
2.09961e-02 |
1.359e-02 |
Conversion electron |
|
2.34661e-02 |
1.348e-01 |
Conversion electron |
|
2.43520e-02 |
6.613e-02 |
Conversion electron |
|
2.60461e-02 |
1.774e-02 |
Conversion electron |
|
2.73700e-02 |
4.411e-02 |
Conversion electron |
|
3.97100e-02 |
1.328e-02 |
Conversion electron |
|
4.02961e-02 |
1.767e-02 |
Conversion electron |
|
5.50370e-02 |
2.493e-02 |
Conversion electron |
|
5.83170e-02 |
1.988e-02 |
Conversion electron |
|
7.02961e-02 |
1.257e-02 |
Conversion electron |
|
1.51110e-01 |
1.817e-02 |
Conversion electron |
|
1.70200e-01 |
2.161e-02 |
Conversion electron |
|
1.92900e-01 |
1.579e-02 |
Conversion electron |
|
2.22890e-01 |
1.249e-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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