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Radionuclide Dosimetric Data Sheets
Europium-157
Summary data
General
Classification
Isotope: Eu-157
Atomic number (Z): 63
Mass number (A): 157
Neutron number (N): 94
Radioactive decay
Decay modes: β-
Half-life: 15.18 [h]
Decay constant: 1.2684e-05 [1/s]
Daughters: Gd-157 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.39611 [MeV]
Mean photon energy: 0.29297 [MeV]
Air kerma rate constant, Γ10: 1.181e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.181e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.346e-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-:
6.346e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.694e-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-157 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-157 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-157 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-157 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94229e-05 |
1.214e+01 |
X-ray |
|
1.09378e-03 |
1.862e-02 |
X-ray |
|
6.04290e-03 |
8.533e-02 |
X-ray |
|
6.71540e-03 |
5.633e-02 |
X-ray |
|
7.08639e-03 |
1.451e-02 |
X-ray |
|
9.36500e-03 |
1.639e-02 |
Gamma |
|
4.23559e-02 |
1.793e-01 |
X-ray |
|
4.30603e-02 |
3.225e-01 |
X-ray |
|
4.86161e-02 |
3.277e-02 |
X-ray |
|
4.87612e-02 |
6.338e-02 |
X-ray |
|
5.00239e-02 |
1.398e-02 |
X-ray |
|
5.45480e-02 |
3.740e-02 |
Gamma |
|
6.39290e-02 |
2.299e-01 |
Gamma |
|
3.18710e-01 |
2.893e-02 |
Gamma |
|
3.70509e-01 |
1.100e-01 |
Gamma |
|
3.98953e-01 |
1.320e-02 |
Gamma |
|
4.09135e-01 |
2.673e-02 |
Gamma |
|
4.10723e-01 |
1.749e-01 |
Gamma |
|
4.50761e-01 |
1.221e-02 |
Gamma |
|
4.74625e-01 |
2.519e-02 |
Gamma |
|
5.70937e-01 |
1.562e-02 |
Gamma |
|
6.19303e-01 |
3.553e-02 |
Gamma |
|
6.87502e-01 |
1.177e-02 |
Gamma |
|
1.90776e-01 |
1.980e-02 |
Beta |
|
2.14447e-01 |
2.970e-02 |
Beta |
|
2.15714e-01 |
3.960e-02 |
Beta |
|
2.75571e-01 |
3.960e-02 |
Beta |
|
2.79500e-01 |
2.970e-02 |
Beta |
|
2.95049e-01 |
2.178e-01 |
Beta |
|
3.10800e-01 |
1.485e-01 |
Beta |
|
4.61338e-01 |
4.752e-01 |
Beta |
|
1.68638e-05 |
8.158e-01 |
Auger electron |
|
1.13400e-04 |
5.459e+00 |
Auger electron |
|
1.23333e-04 |
4.499e-01 |
Auger electron |
|
1.82073e-04 |
8.387e-01 |
Auger electron |
|
5.68170e-04 |
1.622e-01 |
Auger electron |
|
8.97333e-04 |
1.854e+00 |
Auger electron |
|
1.01520e-03 |
7.170e-02 |
Conversion electron |
|
1.07434e-03 |
1.256e-01 |
Auger electron |
|
1.41800e-03 |
1.341e-01 |
Conversion electron |
|
1.53100e-03 |
8.540e-02 |
Conversion electron |
|
2.12230e-03 |
2.257e-01 |
Conversion electron |
|
4.24500e-03 |
3.693e-01 |
Conversion electron |
|
4.76922e-03 |
6.762e-01 |
Auger electron |
|
5.92473e-03 |
2.371e-01 |
Auger electron |
|
7.11459e-03 |
2.059e-02 |
Auger electron |
|
7.82320e-03 |
1.018e-01 |
Conversion electron |
|
9.36500e-03 |
2.481e-02 |
Conversion electron |
|
1.36260e-02 |
1.828e-01 |
Conversion electron |
|
1.40970e-02 |
1.224e-02 |
Conversion electron |
|
3.47387e-02 |
2.798e-02 |
Auger electron |
|
4.11460e-02 |
1.385e-02 |
Auger electron |
|
4.34842e-02 |
1.129e-02 |
Conversion electron |
|
4.61982e-02 |
4.880e-02 |
Conversion electron |
|
4.66010e-02 |
1.509e-02 |
Conversion electron |
|
4.73053e-02 |
1.365e-02 |
Conversion electron |
|
5.30062e-02 |
1.734e-02 |
Conversion electron |
|
5.55792e-02 |
1.784e-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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