<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Terbium-156n
Summary data
General
Classification
Isotope: Tb-156n
Atomic number (Z): 65
Mass number (A): 156
Neutron number (N): 91
Radioactive decay
Decay modes: Internal transition
Half-life: 5.3 [h]
Decay constant: 3.6328e-05 [1/s]
Daughters: Tb-156 (100.0%)
Radioactive daughters: Tb-156
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08738 [MeV]
Mean photon energy: 0.00476 [MeV]
Air kerma rate constant, Γ10: 1.961e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.961e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.400e-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-:
1.400e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.626e-16
[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-156n 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-156n 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-156n Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.38078e-05 |
8.311e+00 |
X-ray |
|
1.15978e-03 |
1.446e-02 |
X-ray |
|
6.26069e-03 |
5.578e-02 |
X-ray |
|
6.98190e-03 |
5.998e-02 |
X-ray |
|
8.10032e-03 |
1.047e-02 |
X-ray |
|
4.37992e-02 |
1.626e-02 |
X-ray |
|
4.45546e-02 |
2.914e-02 |
X-ray |
|
8.84000e-02 |
1.170e-02 |
Gamma |
|
1.73725e-05 |
4.874e-01 |
Auger electron |
|
1.21989e-04 |
3.795e+00 |
Auger electron |
|
1.32551e-04 |
2.377e-01 |
Auger electron |
|
2.01492e-04 |
5.953e-01 |
Auger electron |
|
5.45700e-04 |
6.893e-02 |
Auger electron |
|
9.61394e-04 |
1.314e+00 |
Auger electron |
|
1.13560e-03 |
7.451e-02 |
Auger electron |
|
4.97374e-03 |
4.598e-01 |
Auger electron |
|
6.17870e-03 |
1.608e-01 |
Auger electron |
|
7.41657e-03 |
1.413e-02 |
Auger electron |
|
3.63400e-02 |
6.040e-02 |
Conversion electron |
|
8.01391e-02 |
3.761e-01 |
Conversion electron |
|
8.08947e-02 |
3.511e-01 |
Conversion electron |
|
8.68032e-02 |
1.862e-01 |
Conversion electron |
|
8.84000e-02 |
4.893e-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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
<= Return to MIRDspec isotope database
