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Radionuclide Dosimetric Data Sheets

Terbium-156

Summary data

General

Classification

Isotope:  Tb-156
Atomic number (Z):  65
Mass number (A):  156
Neutron number (N):  91

Radioactive decay

Decay modes:  Electron capture
Half-life:  5.35 [d]
Decay constant:  1.4995e-06 [1/s]
Daughters:  Gd-156 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.08351 [MeV]
Mean photon energy:  1.93705 [MeV]
Air kerma rate constant, Γ10:  6.929e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  6.929e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.338e-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-:  1.338e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.104e-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/Tb-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/Tb-156 Summary 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/Tb-156 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94289e-05

1.622e+01

X-ray

1.09465e-03

2.484e-02

X-ray

6.01111e-03

1.264e-02

X-ray

6.04290e-03

1.118e-01

X-ray

6.71540e-03

7.985e-02

X-ray

7.08639e-03

1.901e-02

X-ray

7.78484e-03

1.402e-02

X-ray

4.23559e-02

3.195e-01

X-ray

4.30603e-02

5.745e-01

X-ray

4.86161e-02

5.838e-02

X-ray

4.87612e-02

1.129e-01

X-ray

4.99916e-02

1.283e-02

X-ray

5.00239e-02

2.490e-02

X-ray

8.89700e-02

1.767e-01

Gamma

1.11930e-01

1.488e-02

Gamma

1.55150e-01

1.581e-02

Gamma

1.99190e-01

4.092e-01

Gamma

2.62540e-01

5.766e-02

Gamma

2.96490e-01

4.464e-02

Gamma

3.56380e-01

1.361e-01

Gamma

4.22340e-01

7.955e-02

Gamma

5.34290e-01

6.659e-01

Gamma

7.80080e-01

2.325e-02

Gamma

9.25680e-01

3.410e-02

Gamma

9.49080e-01

1.609e-02

Gamma

9.59660e-01

1.962e-02

Gamma

1.03776e+00

1.045e-02

Gamma

1.06511e+00

1.077e-01

Gamma

1.06715e+00

2.812e-02

Gamma

1.15407e+00

1.037e-01

Gamma

1.15903e+00

7.248e-02

Gamma

1.22244e+00

3.100e-01

Gamma

1.26660e+00

1.073e-02

Gamma

1.33446e+00

2.539e-02

Gamma

1.42167e+00

1.223e-01

Gamma

1.64624e+00

3.782e-02

Gamma

1.84545e+00

4.123e-02

Gamma

2.01445e+00

1.122e-02

Gamma

1.68638e-05

1.088e+00

Auger electron

1.13408e-04

7.295e+00

Auger electron

1.23241e-04

6.025e-01

Auger electron

1.83174e-04

1.138e+00

Auger electron

5.63340e-04

2.113e-01

Auger electron

8.98010e-04

2.468e+00

Auger electron

1.07565e-03

1.675e-01

Auger electron

4.77511e-03

9.023e-01

Auger electron

5.93064e-03

3.165e-01

Auger electron

7.12052e-03

2.749e-02

Auger electron

3.47386e-02

4.984e-02

Auger electron

3.86670e-02

2.743e-01

Conversion electron

4.11460e-02

2.468e-02

Auger electron

6.16270e-02

1.838e-02

Conversion electron

8.06202e-02

2.462e-02

Conversion electron

8.10230e-02

1.450e-01

Conversion electron

8.17273e-02

1.529e-01

Conversion electron

8.74282e-02

7.620e-02

Conversion electron

8.89700e-02

2.016e-02

Conversion electron

1.48887e-01

6.409e-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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