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Radionuclide Dosimetric Data Sheets
Dysprosium-149
Summary data
General
Classification
Isotope: Dy-149
Atomic number (Z): 66
Mass number (A): 149
Neutron number (N): 83
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.2 [m]
Decay constant: 2.7506e-03 [1/s]
Daughters: Tb-149 (56.7%), Tb-149m (43.3%)
Radioactive daughters: Tb-149, Tb-149m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.11202 [MeV]
Mean photon energy: 1.62219 [MeV]
Air kerma rate constant, Γ10: 5.369e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.686e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.795e-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-:
1.795e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.599e-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-149 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-149 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-149 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-149 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.38217e-05 |
1.265e+01 |
X-ray |
|
1.16031e-03 |
2.150e-02 |
X-ray |
|
6.22630e-03 |
1.075e-02 |
X-ray |
|
6.26069e-03 |
9.505e-02 |
X-ray |
|
6.98190e-03 |
6.235e-02 |
X-ray |
|
7.35101e-03 |
1.604e-02 |
X-ray |
|
8.10032e-03 |
1.089e-02 |
X-ray |
|
4.37992e-02 |
3.237e-01 |
X-ray |
|
4.45546e-02 |
5.802e-01 |
X-ray |
|
5.03066e-02 |
5.935e-02 |
X-ray |
|
5.04632e-02 |
1.148e-01 |
X-ray |
|
5.17440e-02 |
1.302e-02 |
X-ray |
|
5.17791e-02 |
2.524e-02 |
X-ray |
|
1.00800e-01 |
1.520e-01 |
Gamma |
|
1.06300e-01 |
8.100e-02 |
Gamma |
|
2.53400e-01 |
7.000e-02 |
Gamma |
|
4.94600e-01 |
1.000e-02 |
Gamma |
|
5.11000e-01 |
1.635e-01 |
Annihilation photon |
|
6.37300e-01 |
3.020e-02 |
Gamma |
|
6.53600e-01 |
8.900e-02 |
Gamma |
|
7.36500e-01 |
2.480e-02 |
Gamma |
|
7.41700e-01 |
2.320e-02 |
Gamma |
|
7.75300e-01 |
5.400e-02 |
Gamma |
|
7.89400e-01 |
1.180e-01 |
Gamma |
|
8.36700e-01 |
4.500e-02 |
Gamma |
|
8.59600e-01 |
1.020e-02 |
Gamma |
|
8.69600e-01 |
3.100e-02 |
Gamma |
|
8.71300e-01 |
2.080e-02 |
Gamma |
|
9.87800e-01 |
1.300e-02 |
Gamma |
|
9.97500e-01 |
1.040e-02 |
Gamma |
|
1.01050e+00 |
2.300e-02 |
Gamma |
|
1.03980e+00 |
1.630e-02 |
Gamma |
|
1.05790e+00 |
1.730e-02 |
Gamma |
|
1.13520e+00 |
1.600e-02 |
Gamma |
|
1.27440e+00 |
2.150e-02 |
Gamma |
|
1.32370e+00 |
1.080e-02 |
Gamma |
|
1.39000e+00 |
2.050e-02 |
Gamma |
|
1.42260e+00 |
1.940e-02 |
Gamma |
|
1.52120e+00 |
3.700e-02 |
Gamma |
|
1.62740e+00 |
2.200e-02 |
Gamma |
|
1.77630e+00 |
1.110e-01 |
Gamma |
|
1.80600e+00 |
7.500e-02 |
Gamma |
|
1.91740e+00 |
1.520e-02 |
Gamma |
|
2.02960e+00 |
2.530e-02 |
Gamma |
|
8.73208e-01 |
2.076e-02 |
Positron |
|
1.73725e-05 |
7.531e-01 |
Auger electron |
|
1.22017e-04 |
5.778e+00 |
Auger electron |
|
1.35371e-04 |
3.556e-01 |
Auger electron |
|
1.97267e-04 |
9.132e-01 |
Auger electron |
|
6.18704e-04 |
1.814e-01 |
Auger electron |
|
9.60829e-04 |
1.961e+00 |
Auger electron |
|
1.13606e-03 |
1.114e-01 |
Auger electron |
|
4.95016e-03 |
7.094e-01 |
Auger electron |
|
6.15776e-03 |
2.479e-01 |
Auger electron |
|
7.39935e-03 |
2.176e-02 |
Auger electron |
|
3.58945e-02 |
4.818e-02 |
Auger electron |
|
4.25487e-02 |
2.396e-02 |
Auger electron |
|
4.87400e-02 |
2.838e-01 |
Conversion electron |
|
5.42400e-02 |
1.300e-01 |
Conversion electron |
|
9.21269e-02 |
3.774e-02 |
Conversion electron |
|
9.76269e-02 |
1.728e-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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