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Radionuclide Dosimetric Data Sheets

Europium-156

Summary data

General

Classification

Isotope:  Eu-156
Atomic number (Z):  63
Mass number (A):  156
Neutron number (N):  93

Radioactive decay

Decay modes:  β-
Half-life:  15.19 [d]
Decay constant:  5.2815e-07 [1/s]
Daughters:  Gd-156 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.45788 [MeV]
Mean photon energy:  1.23416 [MeV]
Air kerma rate constant, Γ10:  4.105e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  4.105e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  7.336e-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-:  7.336e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.977e-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-156 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-156 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-156 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-156 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94243e-05

2.858e+00

X-ray

6.04290e-03

1.973e-02

X-ray

6.71540e-03

1.606e-02

X-ray

4.23559e-02

3.604e-02

X-ray

4.30603e-02

6.479e-02

X-ray

4.87612e-02

1.274e-02

X-ray

8.89700e-02

8.439e-02

Gamma

5.99470e-01

2.085e-02

Gamma

6.46290e-01

6.279e-02

Gamma

7.23470e-01

5.418e-02

Gamma

8.11770e-01

9.700e-02

Gamma

8.67010e-01

1.328e-02

Gamma

9.44350e-01

1.331e-02

Gamma

9.60500e-01

1.445e-02

Gamma

1.06514e+00

4.922e-02

Gamma

1.07916e+00

4.589e-02

Gamma

1.15367e+00

6.790e-02

Gamma

1.15408e+00

4.734e-02

Gamma

1.23071e+00

7.983e-02

Gamma

1.24242e+00

6.601e-02

Gamma

1.27743e+00

2.886e-02

Gamma

1.36641e+00

1.572e-02

Gamma

1.87703e+00

1.512e-02

Gamma

1.93771e+00

1.944e-02

Gamma

1.96595e+00

3.870e-02

Gamma

2.02665e+00

3.272e-02

Gamma

2.09770e+00

3.809e-02

Gamma

2.18091e+00

2.142e-02

Gamma

2.18671e+00

3.485e-02

Gamma

2.26990e+00

1.031e-02

Gamma

4.90325e-02

4.227e-02

Beta

6.81793e-02

2.214e-02

Beta

7.39031e-02

1.037e-01

Beta

1.25449e-01

5.737e-02

Beta

1.46089e-01

2.919e-01

Beta

3.73089e-01

2.114e-02

Beta

4.23768e-01

5.335e-02

Beta

4.54579e-01

4.127e-02

Beta

5.04377e-01

1.288e-02

Beta

9.64562e-01

3.221e-01

Beta

1.68638e-05

1.904e-01

Auger electron

1.13481e-04

1.284e+00

Auger electron

1.22109e-04

1.067e-01

Auger electron

1.84426e-04

1.977e-01

Auger electron

5.31558e-04

2.773e-02

Auger electron

8.97631e-04

4.412e-01

Auger electron

1.07422e-03

2.988e-02

Auger electron

4.76918e-03

1.601e-01

Auger electron

5.92257e-03

5.614e-02

Auger electron

3.86670e-02

1.310e-01

Conversion electron

8.06202e-02

1.176e-02

Conversion electron

8.10230e-02

6.923e-02

Conversion electron

8.17273e-02

7.302e-02

Conversion electron

8.74282e-02

3.639e-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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