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Radionuclide Dosimetric Data Sheets
Lutetium-181
Summary data
General
Classification
Isotope: Lu-181
Atomic number (Z): 71
Mass number (A): 181
Neutron number (N): 110
Radioactive decay
Decay modes: β-
Half-life: 3.5 [m]
Decay constant: 3.3007e-03 [1/s]
Daughters: Hf-181 (100.0%)
Radioactive daughters: Hf-181
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.85115 [MeV]
Mean photon energy: 0.57403 [MeV]
Air kerma rate constant, Γ10: 2.249e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.249e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.364e-13 [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-:
1.364e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.197e-14
[Gy·kg/Bq·s]
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/Lu-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/Lu-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/Lu-181 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.93452e-05 |
1.375e+01 |
X-ray |
|
1.63854e-03 |
4.068e-02 |
X-ray |
|
7.83280e-03 |
1.425e-02 |
X-ray |
|
7.88958e-03 |
1.257e-01 |
X-ray |
|
8.88688e-03 |
1.161e-02 |
X-ray |
|
9.03751e-03 |
8.292e-02 |
X-ray |
|
9.14599e-03 |
1.497e-02 |
X-ray |
|
9.34358e-03 |
2.185e-02 |
X-ray |
|
1.05374e-02 |
1.509e-02 |
X-ray |
|
4.58000e-02 |
6.600e-02 |
Gamma |
|
5.29000e-02 |
3.960e-02 |
Gamma |
|
5.47191e-02 |
9.774e-02 |
X-ray |
|
5.59237e-02 |
1.710e-01 |
X-ray |
|
6.31238e-02 |
1.821e-02 |
X-ray |
|
6.33831e-02 |
3.519e-02 |
X-ray |
|
9.89000e-02 |
3.520e-02 |
Gamma |
|
1.05700e-01 |
3.960e-02 |
Gamma |
|
1.25200e-01 |
3.300e-02 |
Gamma |
|
1.53400e-01 |
2.640e-02 |
Gamma |
|
1.59100e-01 |
1.540e-02 |
Gamma |
|
2.05900e-01 |
1.606e-01 |
Gamma |
|
2.40400e-01 |
4.620e-02 |
Gamma |
|
2.52000e-01 |
1.760e-02 |
Gamma |
|
3.29000e-01 |
5.060e-02 |
Gamma |
|
3.34400e-01 |
3.740e-02 |
Gamma |
|
3.41700e-01 |
3.300e-02 |
Gamma |
|
4.63500e-01 |
4.620e-02 |
Gamma |
|
5.74800e-01 |
1.540e-01 |
Gamma |
|
5.90000e-01 |
3.300e-02 |
Gamma |
|
6.52400e-01 |
2.200e-01 |
Gamma |
|
7.00400e-01 |
4.180e-02 |
Gamma |
|
8.06000e-01 |
8.800e-02 |
Gamma |
|
8.58500e-01 |
7.700e-02 |
Gamma |
|
6.49732e-01 |
6.869e-01 |
Beta |
|
9.13048e-01 |
1.111e-01 |
Beta |
|
9.54060e-01 |
6.061e-02 |
Beta |
|
1.00069e+00 |
1.414e-01 |
Beta |
|
1.09046e-05 |
1.214e+00 |
Auger electron |
|
2.44625e-05 |
1.710e+00 |
Auger electron |
|
1.59702e-04 |
4.776e+00 |
Auger electron |
|
2.87643e-04 |
1.546e-01 |
Auger electron |
|
3.06793e-04 |
8.362e-01 |
Auger electron |
|
5.28017e-04 |
4.038e-01 |
Auger electron |
|
1.36392e-03 |
2.041e+00 |
Auger electron |
|
1.54421e-03 |
1.074e-01 |
Auger electron |
|
6.22196e-03 |
6.189e-01 |
Auger electron |
|
7.85045e-03 |
2.302e-01 |
Auger electron |
|
9.51301e-03 |
2.160e-02 |
Auger electron |
|
3.34180e-02 |
3.410e-02 |
Conversion electron |
|
3.45550e-02 |
3.070e-01 |
Conversion electron |
|
3.50370e-02 |
1.191e-01 |
Conversion electron |
|
3.62417e-02 |
1.061e-01 |
Conversion electron |
|
4.02180e-02 |
1.172e-01 |
Conversion electron |
|
4.16550e-02 |
1.179e-01 |
Conversion electron |
|
4.21370e-02 |
5.689e-02 |
Conversion electron |
|
4.33417e-02 |
5.181e-02 |
Conversion electron |
|
4.37010e-02 |
1.255e-01 |
Conversion electron |
|
4.45280e-02 |
1.084e-02 |
Auger electron |
|
4.58000e-02 |
3.526e-02 |
Conversion electron |
|
5.08010e-02 |
5.369e-02 |
Conversion electron |
|
5.29000e-02 |
1.506e-02 |
Conversion electron |
|
5.97180e-02 |
6.020e-02 |
Conversion electron |
|
8.79180e-02 |
2.701e-02 |
Conversion electron |
|
8.81370e-02 |
3.675e-02 |
Conversion electron |
|
8.93417e-02 |
3.394e-02 |
Conversion electron |
|
9.44550e-02 |
1.662e-02 |
Conversion electron |
|
9.68010e-02 |
1.857e-02 |
Conversion electron |
|
1.40418e-01 |
7.242e-02 |
Conversion electron |
|
1.74918e-01 |
1.357e-02 |
Conversion electron |
|
1.94655e-01 |
1.021e-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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