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Radionuclide Dosimetric Data Sheets
Europium-146
Summary data
General
Classification
Isotope: Eu-146
Atomic number (Z): 63
Mass number (A): 146
Neutron number (N): 83
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.61 [d]
Decay constant: 1.7402e-06 [1/s]
Daughters: Sm-146 (100.0%)
Radioactive daughters: Sm-146
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04551 [MeV]
Mean photon energy: 2.40067 [MeV]
Air kerma rate constant, Γ10: 8.501e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.680e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.292e-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-:
7.292e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.846e-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/Eu-146 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/Eu-146 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/Eu-146 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/Eu-146 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45275e-05 |
9.446e+00 |
X-ray |
|
9.69584e-04 |
1.104e-02 |
X-ray |
|
5.62210e-03 |
5.529e-02 |
X-ray |
|
6.20531e-03 |
3.494e-02 |
X-ray |
|
3.95578e-02 |
2.147e-01 |
X-ray |
|
4.01680e-02 |
3.886e-01 |
X-ray |
|
4.53441e-02 |
3.895e-02 |
X-ray |
|
4.54683e-02 |
7.535e-02 |
X-ray |
|
4.66259e-02 |
1.640e-02 |
X-ray |
|
4.30386e-01 |
4.718e-02 |
Gamma |
|
5.11000e-01 |
9.229e-02 |
Annihilation photon |
|
6.32890e-01 |
1.281e-02 |
Gamma |
|
6.33083e-01 |
3.585e-01 |
Gamma |
|
6.34137e-01 |
4.501e-01 |
Gamma |
|
6.64650e-01 |
3.349e-02 |
Gamma |
|
6.65424e-01 |
7.230e-02 |
Gamma |
|
7.02099e-01 |
3.822e-02 |
Gamma |
|
7.03089e-01 |
3.743e-02 |
Gamma |
|
7.04774e-01 |
1.881e-02 |
Gamma |
|
7.47159e-01 |
9.850e-01 |
Gamma |
|
8.88460e-01 |
1.083e-02 |
Gamma |
|
8.99486e-01 |
1.359e-02 |
Gamma |
|
9.00797e-01 |
2.945e-02 |
Gamma |
|
1.05762e+00 |
2.266e-02 |
Gamma |
|
1.05871e+00 |
3.940e-02 |
Gamma |
|
1.15063e+00 |
2.118e-02 |
Gamma |
|
1.17652e+00 |
1.615e-02 |
Gamma |
|
1.29703e+00 |
5.388e-02 |
Gamma |
|
1.40698e+00 |
1.724e-02 |
Gamma |
|
1.40866e+00 |
1.231e-02 |
Gamma |
|
1.53371e+00 |
6.077e-02 |
Gamma |
|
1.93109e+00 |
1.192e-02 |
Gamma |
|
2.08111e+00 |
1.487e-02 |
Gamma |
|
6.66379e-01 |
1.996e-02 |
Positron |
|
6.66824e-01 |
2.225e-02 |
Positron |
|
1.51033e-05 |
7.393e-01 |
Auger electron |
|
9.43384e-05 |
6.044e-01 |
Auger electron |
|
1.06704e-04 |
3.950e+00 |
Auger electron |
|
1.68897e-04 |
6.322e-01 |
Auger electron |
|
5.10316e-04 |
1.275e-01 |
Auger electron |
|
8.03871e-04 |
1.352e+00 |
Auger electron |
|
9.74074e-04 |
8.661e-02 |
Auger electron |
|
4.45974e-03 |
5.035e-01 |
Auger electron |
|
5.51005e-03 |
1.722e-01 |
Auger electron |
|
6.59419e-03 |
1.468e-02 |
Auger electron |
|
3.25196e-02 |
3.706e-02 |
Auger electron |
|
3.84443e-02 |
1.806e-02 |
Auger 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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