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Radionuclide Dosimetric Data Sheets

Europium-155

Isotope:  Eu-155
Atomic number (Z):  63
Mass number (A):  155
Neutron number (N):  92

Decay modes:  β-
Half-life:  4.761 [y]
Decay constant:  4.6134e-09 [1/s]
Daughters:  Gd-155 (100.0%)
Radioactive daughters:  None

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.06471 [MeV]
Mean photon energy:  0.06118 [MeV]
Air kerma rate constant, Γ₁₀:  2.271e-18 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  2.271e-18 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.037e-14 [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-:  1.037e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  9.802e-15 [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-155 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-155 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-155 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-155 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.94271e-05	4.625e+00	X-ray
6.04290e-03	3.178e-02	X-ray
6.71540e-03	2.246e-02	X-ray
4.23559e-02	6.586e-02	X-ray
4.30603e-02	1.184e-01	X-ray
4.52972e-02	1.326e-02	Gamma
4.86161e-02	1.203e-02	X-ray
4.87612e-02	2.327e-02	X-ray
6.00086e-02	1.130e-02	Gamma
8.65450e-02	3.070e-01	Gamma
1.05305e-01	2.115e-01	Gamma
3.56138e-02	2.284e-02	Beta
3.91946e-02	4.666e-01	Beta
4.45576e-02	2.482e-01	Beta
5.22619e-02	8.042e-02	Beta
7.02099e-02	1.747e-01	Beta
1.68638e-05	3.106e-01	Auger electron
1.13406e-04	2.080e+00	Auger electron
1.23275e-04	1.717e-01	Auger electron
1.83156e-04	3.250e-01	Auger electron
5.65340e-04	6.150e-02	Auger electron
8.98069e-04	7.029e-01	Auger electron
1.07580e-03	4.771e-02	Auger electron
4.77589e-03	2.565e-01	Auger electron
5.93163e-03	8.995e-02	Auger electron
9.70560e-03	8.478e-02	Conversion electron
1.04142e-02	1.502e-02	Conversion electron
1.08170e-02	5.427e-02	Conversion electron
1.15213e-02	7.383e-02	Conversion electron
1.72222e-02	3.306e-02	Conversion electron
3.47386e-02	1.027e-02	Auger electron
3.62420e-02	1.107e-01	Conversion electron
5.16588e-02	1.115e-02	Conversion electron
5.50020e-02	4.512e-02	Conversion electron
7.81952e-02	1.120e-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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