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Radionuclide Dosimetric Data Sheets
Dysprosium-166
Summary data
General
Classification
Isotope: Dy-166
Atomic number (Z): 66
Mass number (A): 166
Neutron number (N): 100
Radioactive decay
Decay modes: β-
Half-life: 81.6 [h]
Decay constant: 2.3596e-06 [1/s]
Daughters: Ho-166 (100.0%)
Radioactive daughters: Ho-166
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16667 [MeV]
Mean photon energy: 0.04333 [MeV]
Air kerma rate constant, Γ10: 1.999e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.999e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.670e-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-:
2.670e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.942e-15
[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/Dy-166 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/Dy-166 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/Dy-166 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/Dy-166 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36376e-05 |
9.202e+00 |
X-ray |
|
1.30009e-03 |
1.923e-02 |
X-ray |
|
6.70640e-03 |
7.172e-02 |
X-ray |
|
7.53349e-03 |
5.524e-02 |
X-ray |
|
7.89548e-03 |
1.217e-02 |
X-ray |
|
2.82270e-02 |
1.132e-02 |
Gamma |
|
4.67702e-02 |
1.478e-01 |
X-ray |
|
4.76373e-02 |
2.632e-01 |
X-ray |
|
5.37885e-02 |
2.726e-02 |
X-ray |
|
5.39705e-02 |
5.269e-02 |
X-ray |
|
5.53966e-02 |
1.165e-02 |
X-ray |
|
8.24700e-02 |
1.380e-01 |
Gamma |
|
1.56270e-02 |
1.163e-02 |
Beta |
|
1.18443e-01 |
8.913e-01 |
Beta |
|
1.41287e-01 |
4.844e-02 |
Beta |
|
1.46222e-01 |
4.844e-02 |
Beta |
|
1.89749e-05 |
4.819e-01 |
Auger electron |
|
1.34731e-04 |
4.191e+00 |
Auger electron |
|
1.79814e-04 |
1.733e-01 |
Auger electron |
|
2.23529e-04 |
7.094e-01 |
Auger electron |
|
7.12102e-04 |
1.814e-01 |
Auger electron |
|
1.07616e-03 |
1.461e+00 |
Auger electron |
|
1.25482e-03 |
7.634e-02 |
Auger electron |
|
5.34510e-03 |
5.136e-01 |
Auger electron |
|
6.66885e-03 |
1.824e-01 |
Auger electron |
|
8.02795e-03 |
1.633e-02 |
Auger electron |
|
1.88668e-02 |
1.409e-01 |
Conversion electron |
|
1.92983e-02 |
1.289e-02 |
Conversion electron |
|
2.64985e-02 |
3.462e-02 |
Conversion electron |
|
2.67710e-02 |
5.458e-01 |
Conversion electron |
|
3.82545e-02 |
2.042e-02 |
Auger electron |
|
4.53103e-02 |
9.193e-02 |
Conversion electron |
|
4.54244e-02 |
1.027e-02 |
Auger electron |
|
4.61773e-02 |
1.057e-01 |
Conversion electron |
|
5.25105e-02 |
4.848e-02 |
Conversion electron |
|
5.42390e-02 |
1.270e-02 |
Conversion electron |
|
7.31098e-02 |
7.398e-02 |
Conversion electron |
|
8.07415e-02 |
1.806e-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)
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