<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Thulium-168
Summary data
General
Classification
Isotope: Tm-168
Atomic number (Z): 69
Mass number (A): 168
Neutron number (N): 99
Radioactive decay
Decay modes: β-, β+, Electron capture
Half-life: 93.1 [d]
Decay constant: 8.6171e-08 [1/s]
Daughters: Er-168 (100.0%), Yb-168 (0.01%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08471 [MeV]
Mean photon energy: 1.24319 [MeV]
Air kerma rate constant, Γ10: 4.601e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.601e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.357e-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-:
1.357e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.992e-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/Tm-168 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/Tm-168 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/Tm-168 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/Tm-168 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35544e-05 |
1.497e+01 |
X-ray |
|
1.36816e-03 |
3.568e-02 |
X-ray |
|
6.89239e-03 |
1.515e-02 |
X-ray |
|
6.93540e-03 |
1.338e-01 |
X-ray |
|
7.81980e-03 |
1.057e-01 |
X-ray |
|
8.17512e-03 |
2.275e-02 |
X-ray |
|
9.09455e-03 |
1.869e-02 |
X-ray |
|
4.82994e-02 |
2.751e-01 |
X-ray |
|
4.92265e-02 |
4.882e-01 |
X-ray |
|
5.55821e-02 |
5.085e-02 |
X-ray |
|
5.57777e-02 |
9.828e-02 |
X-ray |
|
5.72170e-02 |
1.126e-02 |
X-ray |
|
5.72611e-02 |
2.178e-02 |
X-ray |
|
7.98040e-02 |
1.081e-01 |
Gamma |
|
9.92890e-02 |
4.180e-02 |
Gamma |
|
1.84295e-01 |
1.791e-01 |
Gamma |
|
1.98251e-01 |
5.379e-01 |
Gamma |
|
4.47515e-01 |
2.367e-01 |
Gamma |
|
5.46800e-01 |
2.620e-02 |
Gamma |
|
6.31705e-01 |
9.145e-02 |
Gamma |
|
6.45775e-01 |
1.463e-02 |
Gamma |
|
7.20392e-01 |
1.205e-01 |
Gamma |
|
7.30660e-01 |
5.207e-02 |
Gamma |
|
7.41355e-01 |
1.264e-01 |
Gamma |
|
8.15989e-01 |
5.030e-01 |
Gamma |
|
8.21162e-01 |
1.183e-01 |
Gamma |
|
8.29948e-01 |
6.886e-02 |
Gamma |
|
9.14933e-01 |
3.077e-02 |
Gamma |
|
1.27745e+00 |
1.662e-02 |
Gamma |
|
1.98170e-05 |
7.298e-01 |
Auger electron |
|
1.41497e-04 |
6.743e+00 |
Auger electron |
|
2.01232e-04 |
2.405e-01 |
Auger electron |
|
2.36081e-04 |
1.160e+00 |
Auger electron |
|
7.45077e-04 |
2.275e-01 |
Auger electron |
|
1.13492e-03 |
2.487e+00 |
Auger electron |
|
1.31169e-03 |
1.238e-01 |
Auger electron |
|
5.49433e-03 |
8.615e-01 |
Auger electron |
|
6.87155e-03 |
3.073e-01 |
Auger electron |
|
8.28161e-03 |
2.771e-02 |
Auger electron |
|
2.22300e-02 |
1.796e-01 |
Conversion electron |
|
3.94671e-02 |
3.628e-02 |
Auger electron |
|
4.17150e-02 |
1.457e-02 |
Conversion electron |
|
4.69039e-02 |
1.836e-02 |
Auger electron |
|
7.00878e-02 |
1.755e-02 |
Conversion electron |
|
7.05292e-02 |
2.140e-01 |
Conversion electron |
|
7.14566e-02 |
2.213e-01 |
Conversion electron |
|
7.80078e-02 |
1.108e-01 |
Conversion electron |
|
7.98040e-02 |
2.914e-02 |
Conversion electron |
|
1.26721e-01 |
3.682e-02 |
Conversion electron |
|
1.40677e-01 |
2.417e-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
