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Radionuclide Dosimetric Data Sheets
Dysprosium-155
Summary data
General
Classification
Isotope: Dy-155
Atomic number (Z): 66
Mass number (A): 155
Neutron number (N): 89
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 9.9 [h]
Decay constant: 1.9449e-05 [1/s]
Daughters: Tb-155 (100.0%)
Radioactive daughters: Tb-155
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02722 [MeV]
Mean photon energy: 0.66867 [MeV]
Air kerma rate constant, Γ10: 2.413e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.464e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.361e-15 [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-:
4.361e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.071e-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/Dy-155 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-155 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-155 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-155 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.38233e-05 |
1.076e+01 |
X-ray |
|
1.16047e-03 |
1.825e-02 |
X-ray |
|
6.26069e-03 |
8.025e-02 |
X-ray |
|
6.98190e-03 |
5.282e-02 |
X-ray |
|
7.35101e-03 |
1.354e-02 |
X-ray |
|
4.37992e-02 |
2.689e-01 |
X-ray |
|
4.45546e-02 |
4.819e-01 |
X-ray |
|
5.03066e-02 |
4.929e-02 |
X-ray |
|
5.04632e-02 |
9.534e-02 |
X-ray |
|
5.17440e-02 |
1.082e-02 |
X-ray |
|
5.17791e-02 |
2.096e-02 |
X-ray |
|
6.54590e-02 |
1.833e-02 |
Gamma |
|
9.03260e-02 |
1.067e-02 |
Gamma |
|
1.61443e-01 |
1.149e-02 |
Gamma |
|
1.84564e-01 |
3.372e-02 |
Gamma |
|
2.26918e-01 |
6.840e-01 |
Gamma |
|
2.71056e-01 |
1.211e-02 |
Gamma |
|
4.84158e-01 |
1.067e-02 |
Gamma |
|
4.98617e-01 |
1.751e-02 |
Gamma |
|
5.08440e-01 |
1.190e-02 |
Gamma |
|
5.11000e-01 |
2.654e-02 |
Annihilation photon |
|
6.41072e-01 |
1.252e-02 |
Gamma |
|
6.64173e-01 |
2.244e-02 |
Gamma |
|
9.05515e-01 |
2.449e-02 |
Gamma |
|
9.99680e-01 |
2.435e-02 |
Gamma |
|
1.08980e+00 |
2.811e-02 |
Gamma |
|
1.09000e+00 |
2.811e-02 |
Gamma |
|
1.15547e+00 |
2.086e-02 |
Gamma |
|
1.16622e+00 |
1.692e-02 |
Gamma |
|
3.90523e-01 |
1.222e-02 |
Positron |
|
1.73725e-05 |
6.412e-01 |
Auger electron |
|
1.22006e-04 |
4.917e+00 |
Auger electron |
|
1.35543e-04 |
3.029e-01 |
Auger electron |
|
1.97347e-04 |
7.796e-01 |
Auger electron |
|
6.20177e-04 |
1.585e-01 |
Auger electron |
|
9.60969e-04 |
1.665e+00 |
Auger electron |
|
1.13643e-03 |
9.467e-02 |
Auger electron |
|
4.95315e-03 |
6.019e-01 |
Auger electron |
|
6.16111e-03 |
2.104e-01 |
Auger electron |
|
7.40322e-03 |
1.847e-02 |
Auger electron |
|
1.33990e-02 |
1.176e-01 |
Conversion electron |
|
3.58945e-02 |
4.002e-02 |
Auger electron |
|
3.82660e-02 |
2.702e-02 |
Conversion electron |
|
4.25487e-02 |
1.990e-02 |
Auger electron |
|
5.67859e-02 |
1.565e-02 |
Conversion electron |
|
1.74858e-01 |
1.963e-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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