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Radionuclide Dosimetric Data Sheets
Dysprosium-157
Summary data
General
Classification
Isotope: Dy-157
Atomic number (Z): 66
Mass number (A): 157
Neutron number (N): 91
Radioactive decay
Decay modes: Electron capture
Half-life: 8.14 [h]
Decay constant: 2.3654e-05 [1/s]
Daughters: Tb-157 (100.0%)
Radioactive daughters: Tb-157
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01378 [MeV]
Mean photon energy: 0.34717 [MeV]
Air kerma rate constant, Γ10: 1.383e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.383e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.208e-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-:
2.208e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.562e-14
[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-157 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-157 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/Dy-157 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.38232e-05 |
9.560e+00 |
X-ray |
|
1.16047e-03 |
1.622e-02 |
X-ray |
|
6.26069e-03 |
7.139e-02 |
X-ray |
|
6.98190e-03 |
4.679e-02 |
X-ray |
|
7.35101e-03 |
1.205e-02 |
X-ray |
|
4.37992e-02 |
2.417e-01 |
X-ray |
|
4.45546e-02 |
4.332e-01 |
X-ray |
|
5.03066e-02 |
4.431e-02 |
X-ray |
|
5.04632e-02 |
8.571e-02 |
X-ray |
|
5.17791e-02 |
1.885e-02 |
X-ray |
|
1.82200e-01 |
1.840e-02 |
Gamma |
|
3.26160e-01 |
9.200e-01 |
Gamma |
|
1.73725e-05 |
5.695e-01 |
Auger electron |
|
1.22007e-04 |
4.368e+00 |
Auger electron |
|
1.35553e-04 |
2.690e-01 |
Auger electron |
|
1.97314e-04 |
6.924e-01 |
Auger electron |
|
6.20224e-04 |
1.406e-01 |
Auger electron |
|
9.60957e-04 |
1.479e+00 |
Auger electron |
|
1.13641e-03 |
8.410e-02 |
Auger electron |
|
4.95252e-03 |
5.348e-01 |
Auger electron |
|
6.16044e-03 |
1.869e-01 |
Auger electron |
|
7.40249e-03 |
1.641e-02 |
Auger electron |
|
8.76000e-03 |
3.678e-02 |
Conversion electron |
|
3.09500e-02 |
1.984e-02 |
Conversion electron |
|
3.58945e-02 |
3.598e-02 |
Auger electron |
|
4.25487e-02 |
1.789e-02 |
Auger electron |
|
2.74100e-01 |
1.054e-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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