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Radionuclide Dosimetric Data Sheets
Rhenium-181
Summary data
General
Classification
Isotope: Re-181
Atomic number (Z): 75
Mass number (A): 181
Neutron number (N): 106
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 19.9 [h]
Decay constant: 9.6754e-06 [1/s]
Daughters: W-181 (100.0%)
Radioactive daughters: W-181
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.136 [MeV]
Mean photon energy: 0.80444 [MeV]
Air kerma rate constant, Γ10: 3.089e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.089e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.179e-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-:
2.179e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.289e-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/Re-181 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/Re-181 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/Re-181 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/Re-181 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.12468e-05 |
1.602e+01 |
X-ray |
|
1.77644e-03 |
5.923e-02 |
X-ray |
|
7.40949e-03 |
1.303e-02 |
X-ray |
|
8.32493e-03 |
2.213e-02 |
X-ray |
|
8.38982e-03 |
1.952e-01 |
X-ray |
|
9.69189e-03 |
1.248e-01 |
X-ray |
|
9.95867e-03 |
3.462e-02 |
X-ray |
|
1.13129e-02 |
2.323e-02 |
X-ray |
|
5.81161e-02 |
3.368e-01 |
X-ray |
|
5.94830e-02 |
5.847e-01 |
X-ray |
|
6.50000e-02 |
2.368e-02 |
Gamma |
|
6.71212e-02 |
6.287e-02 |
X-ray |
|
6.74178e-02 |
1.215e-01 |
X-ray |
|
6.92004e-02 |
1.430e-02 |
X-ray |
|
6.92695e-02 |
2.774e-02 |
X-ray |
|
1.09900e-01 |
2.664e-02 |
Gamma |
|
1.77500e-01 |
1.628e-02 |
Gamma |
|
3.18600e-01 |
1.110e-02 |
Gamma |
|
3.31900e-01 |
1.332e-02 |
Gamma |
|
3.56100e-01 |
1.702e-02 |
Gamma |
|
3.60700e-01 |
1.976e-01 |
Gamma |
|
3.65500e-01 |
5.646e-01 |
Gamma |
|
4.12300e-01 |
1.036e-02 |
Gamma |
|
4.41800e-01 |
1.036e-02 |
Gamma |
|
4.75600e-01 |
1.036e-02 |
Gamma |
|
5.57800e-01 |
2.146e-02 |
Gamma |
|
6.39000e-01 |
6.438e-02 |
Gamma |
|
6.51200e-01 |
1.036e-02 |
Gamma |
|
6.61800e-01 |
2.960e-02 |
Gamma |
|
8.03600e-01 |
1.480e-02 |
Gamma |
|
8.05200e-01 |
3.108e-02 |
Gamma |
|
9.07400e-01 |
1.036e-02 |
Gamma |
|
9.53600e-01 |
3.552e-02 |
Gamma |
|
1.00020e+00 |
3.330e-02 |
Gamma |
|
1.00940e+00 |
2.442e-02 |
Gamma |
|
1.07560e+00 |
1.036e-02 |
Gamma |
|
1.44070e+00 |
1.924e-02 |
Gamma |
|
2.53758e-05 |
3.178e+00 |
Auger electron |
|
1.61316e-04 |
5.440e+00 |
Auger electron |
|
3.15094e-04 |
1.890e-01 |
Auger electron |
|
3.18036e-04 |
1.059e+00 |
Auger electron |
|
6.64957e-04 |
2.729e-01 |
Auger electron |
|
1.47139e-03 |
2.528e+00 |
Auger electron |
|
1.65622e-03 |
1.623e-01 |
Auger electron |
|
2.01100e-03 |
1.107e-02 |
Conversion electron |
|
3.01100e-03 |
2.214e-02 |
Conversion electron |
|
6.51370e-03 |
7.857e-01 |
Auger electron |
|
8.12700e-03 |
6.973e-02 |
Conversion electron |
|
8.27006e-03 |
3.013e-01 |
Auger electron |
|
9.49400e-03 |
8.774e-02 |
Conversion electron |
|
1.00562e-02 |
2.882e-02 |
Auger electron |
|
1.74288e-02 |
3.953e-02 |
Conversion electron |
|
1.97000e-02 |
1.086e-02 |
Conversion electron |
|
3.14230e-02 |
3.076e-02 |
Conversion electron |
|
4.02110e-02 |
7.552e-02 |
Conversion electron |
|
4.06110e-02 |
2.924e-02 |
Conversion electron |
|
4.36110e-02 |
1.917e-02 |
Conversion electron |
|
4.71853e-02 |
3.533e-02 |
Auger electron |
|
5.29230e-02 |
4.486e-02 |
Conversion electron |
|
5.34270e-02 |
2.470e-02 |
Conversion electron |
|
5.47940e-02 |
2.140e-02 |
Conversion electron |
|
5.63739e-02 |
1.852e-02 |
Auger electron |
|
6.27288e-02 |
2.186e-02 |
Conversion electron |
|
9.78230e-02 |
1.081e-02 |
Conversion electron |
|
2.91011e-01 |
1.241e-02 |
Conversion electron |
|
2.95811e-01 |
2.130e-01 |
Conversion electron |
|
3.53423e-01 |
3.645e-02 |
Conversion electron |
|
3.63229e-01 |
1.010e-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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