<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Europium-142
Summary data
General
Classification
Isotope: Eu-142
Atomic number (Z): 63
Mass number (A): 142
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.34 [s]
Decay constant: 2.9622e-01 [1/s]
Daughters: Sm-142 (100.0%)
Radioactive daughters: Sm-142
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 2.76702 [MeV]
Mean photon energy: 1.19703 [MeV]
Air kerma rate constant, Γ10: 8.335e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.427e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.433e-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-:
4.433e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.918e-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-142 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-142 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-142 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-142 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45262e-05 |
7.258e-01 |
X-ray |
|
3.95578e-02 |
1.675e-02 |
X-ray |
|
4.01680e-02 |
3.032e-02 |
X-ray |
|
5.11000e-01 |
1.857e+00 |
Annihilation photon |
|
7.68100e-01 |
1.020e-01 |
Gamma |
|
8.89800e-01 |
1.061e-02 |
Gamma |
|
1.28740e+00 |
1.163e-02 |
Gamma |
|
1.65790e+00 |
1.754e-02 |
Gamma |
|
1.67130e+00 |
1.285e-02 |
Gamma |
|
1.75410e+00 |
1.489e-02 |
Gamma |
|
1.88295e+00 |
1.249e-02 |
Positron |
|
1.92186e+00 |
1.039e-02 |
Positron |
|
2.10270e+00 |
1.359e-02 |
Positron |
|
2.29083e+00 |
2.389e-02 |
Positron |
|
2.71448e+00 |
3.398e-02 |
Positron |
|
3.08271e+00 |
8.096e-01 |
Positron |
|
1.51033e-05 |
5.677e-02 |
Auger electron |
|
9.42616e-05 |
4.643e-02 |
Auger electron |
|
1.06713e-04 |
3.035e-01 |
Auger electron |
|
1.68885e-04 |
4.842e-02 |
Auger electron |
|
8.03744e-04 |
1.041e-01 |
Auger electron |
|
4.45708e-03 |
3.880e-02 |
Auger electron |
|
5.50707e-03 |
1.326e-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)
<= Return to MIRDspec isotope database
