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Radionuclide Dosimetric Data Sheets

Europium-158

Summary data

General

Classification

Isotope:  Eu-158
Atomic number (Z):  63
Mass number (A):  158
Neutron number (N):  95

Radioactive decay

Decay modes:  β-
Half-life:  45.9 [m]
Decay constant:  2.5169e-04 [1/s]
Daughters:  Gd-158 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.89199 [MeV]
Mean photon energy:  1.29776 [MeV]
Air kerma rate constant, Γ10:  4.537e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  4.537e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.429e-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-:  1.429e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  2.079e-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-158 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-158 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-158 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-158 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94236e-05

5.426e+00

X-ray

6.04290e-03

3.739e-02

X-ray

6.71540e-03

3.093e-02

X-ray

4.23559e-02

5.819e-02

X-ray

4.30603e-02

1.046e-01

X-ray

4.86161e-02

1.063e-02

X-ray

4.87612e-02

2.056e-02

X-ray

7.94900e-02

1.050e-01

Gamma

1.81970e-01

2.340e-02

Gamma

5.28050e-01

1.530e-02

Gamma

6.06390e-01

3.960e-02

Gamma

6.98630e-01

1.056e-02

Gamma

7.43020e-01

3.600e-02

Gamma

8.24110e-01

1.290e-02

Gamma

8.70700e-01

1.260e-02

Gamma

8.97610e-01

1.236e-01

Gamma

9.06500e-01

1.830e-02

Gamma

9.22510e-01

1.620e-02

Gamma

9.44150e-01

3.000e-01

Gamma

9.53030e-01

1.980e-02

Gamma

9.62090e-01

1.890e-02

Gamma

9.77140e-01

1.629e-01

Gamma

9.86960e-01

1.350e-02

Gamma

1.00540e+00

1.230e-02

Gamma

1.10763e+00

5.130e-02

Gamma

1.11649e+00

1.260e-02

Gamma

1.18410e+00

3.030e-02

Gamma

1.18600e+00

2.940e-02

Gamma

1.18710e+00

4.410e-02

Gamma

1.26361e+00

2.190e-02

Gamma

1.34795e+00

1.650e-02

Gamma

1.88462e+00

1.230e-02

Gamma

1.94447e+00

1.620e-02

Gamma

3.54190e-01

1.558e-02

Beta

4.03672e-01

3.236e-02

Beta

4.26723e-01

1.638e-02

Beta

5.29556e-01

3.467e-02

Beta

5.55026e-01

6.633e-02

Beta

5.69564e-01

7.638e-02

Beta

6.04976e-01

2.603e-02

Beta

6.28451e-01

7.035e-02

Beta

8.61676e-01

3.719e-02

Beta

9.69178e-01

2.523e-01

Beta

9.90109e-01

2.141e-01

Beta

1.39831e+00

9.045e-02

Beta

1.68638e-05

3.612e-01

Auger electron

1.13488e-04

2.438e+00

Auger electron

1.21991e-04

2.026e-01

Auger electron

1.84607e-04

3.751e-01

Auger electron

5.26410e-04

5.054e-02

Auger electron

8.97626e-04

8.388e-01

Auger electron

1.07414e-03

5.679e-02

Auger electron

4.76875e-03

3.038e-01

Auger electron

5.92191e-03

1.065e-01

Auger electron

2.91870e-02

2.100e-01

Conversion electron

7.11402e-02

1.887e-02

Conversion electron

7.15430e-02

1.464e-01

Conversion electron

7.22473e-02

1.588e-01

Conversion electron

7.79482e-02

7.668e-02

Conversion electron

7.94900e-02

2.025e-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

 

 

 

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