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Radionuclide Dosimetric Data Sheets
Europium-149
Summary data
General
Classification
Isotope: Eu-149
Atomic number (Z): 63
Mass number (A): 149
Neutron number (N): 86
Radioactive decay
Decay modes: Electron capture
Half-life: 93.1 [d]
Decay constant: 8.6171e-08 [1/s]
Daughters: Sm-149 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02411 [MeV]
Mean photon energy: 0.06612 [MeV]
Air kerma rate constant, Γ10: 4.049e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.049e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.863e-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-:
3.863e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.059e-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/Eu-149 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-149 Summary 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-149 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45544e-05 |
1.672e+01 |
X-ray |
|
9.72712e-04 |
1.881e-02 |
X-ray |
|
5.62210e-03 |
8.228e-02 |
X-ray |
|
6.17039e-03 |
1.107e-02 |
X-ray |
|
6.20531e-03 |
5.745e-02 |
X-ray |
|
6.29460e-03 |
1.614e-02 |
X-ray |
|
6.57140e-03 |
1.372e-02 |
X-ray |
|
2.25100e-02 |
2.320e-02 |
Gamma |
|
3.95578e-02 |
2.219e-01 |
X-ray |
|
4.01680e-02 |
4.017e-01 |
X-ray |
|
4.53441e-02 |
4.025e-02 |
X-ray |
|
4.54683e-02 |
7.788e-02 |
X-ray |
|
4.66259e-02 |
1.695e-02 |
X-ray |
|
2.77089e-01 |
3.560e-02 |
Gamma |
|
3.27526e-01 |
4.030e-02 |
Gamma |
|
1.51033e-05 |
1.325e+00 |
Auger electron |
|
3.75600e-05 |
1.056e-02 |
Auger electron |
|
9.56309e-05 |
1.075e+00 |
Auger electron |
|
1.06556e-04 |
7.001e+00 |
Auger electron |
|
1.69453e-04 |
1.177e+00 |
Auger electron |
|
5.32402e-04 |
3.550e-01 |
Auger electron |
|
8.06190e-04 |
2.294e+00 |
Auger electron |
|
9.79829e-04 |
1.480e-01 |
Auger electron |
|
4.51889e-03 |
8.502e-01 |
Auger electron |
|
5.57595e-03 |
2.917e-01 |
Auger electron |
|
6.67064e-03 |
2.503e-02 |
Auger electron |
|
1.48077e-02 |
3.495e-01 |
Conversion electron |
|
1.51918e-02 |
9.266e-02 |
Conversion electron |
|
1.58021e-02 |
9.091e-02 |
Conversion electron |
|
2.11023e-02 |
1.172e-01 |
Conversion electron |
|
2.25100e-02 |
3.190e-02 |
Conversion electron |
|
3.25196e-02 |
3.831e-02 |
Auger electron |
|
3.84443e-02 |
1.867e-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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