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Radionuclide Dosimetric Data Sheets

Europium-142m

Isotope:  Eu-142m
Atomic number (Z):  63
Mass number (A):  142
Neutron number (N):  79

Decay modes:  β+, Electron capture
Half-life:  1.223 [m]
Decay constant:  9.4460e-03 [1/s]
Daughters:  Sm-142 (100.0%)
Radioactive daughters:  Sm-142

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.76825 [MeV]
Mean photon energy:  3.43049 [MeV]
Air kerma rate constant, Γ₁₀:  9.417e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  1.262e-16 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  2.833e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  2.833e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  5.496e-13 [Gy·kg/Bq·s]

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-142m DPK.csv

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-142m Summary Spectrum.csv

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-142m Beta Spectrum.csv

 

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-142m Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.45201e-05	1.019e+01	X-ray
9.68311e-04	1.224e-02	X-ray
5.62210e-03	6.119e-02	X-ray
6.20530e-03	4.595e-02	X-ray
6.57141e-03	1.020e-02	X-ray
3.95578e-02	4.215e-02	X-ray
4.01680e-02	7.629e-02	X-ray
4.54683e-02	1.479e-02	X-ray
2.00900e-01	1.100e-02	Gamma
2.73800e-01	1.200e-02	Gamma
5.11000e-01	1.655e+00	Annihilation photon
5.40000e-01	5.000e-02	Gamma
5.56600e-01	8.660e-01	Gamma
5.63700e-01	8.300e-02	Gamma
6.28700e-01	4.100e-02	Gamma
7.41200e-01	1.700e-02	Gamma
7.68000e-01	1.000e+00	Gamma
1.01610e+00	1.100e-01	Gamma
1.02330e+00	9.200e-01	Gamma
1.34190e+00	2.980e-02	Gamma
1.54118e+00	2.080e-02	Positron
1.69358e+00	1.460e-02	Positron
1.82157e+00	1.259e-02	Positron
1.91590e+00	2.106e-02	Positron
2.12015e+00	1.909e-02	Positron
2.17051e+00	6.964e-01	Positron
1.51033e-05	7.906e-01	Auger electron
9.32067e-05	6.581e-01	Auger electron
1.06844e-04	4.251e+00	Auger electron
1.70642e-04	6.661e-01	Auger electron
4.46355e-04	7.670e-02	Auger electron
8.03037e-04	1.498e+00	Auger electron
9.71283e-04	9.555e-02	Auger electron
4.43940e-03	5.483e-01	Auger electron
5.48551e-03	1.872e-01	Auger electron
6.56291e-03	1.592e-02	Auger electron
1.67818e-02	3.090e-01	Conversion electron
1.73921e-02	4.249e-01	Conversion electron
2.26923e-02	1.699e-01	Conversion electron
2.41000e-02	4.372e-02	Conversion electron

 

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

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

 

 

 

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