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Radionuclide Dosimetric Data Sheets
Dysprosium-165m
Summary data
General
Classification
Isotope: Dy-165m
Atomic number (Z): 66
Mass number (A): 165
Neutron number (N): 99
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 1.257 [m]
Decay constant: 9.1905e-03 [1/s]
Daughters: Dy-165 (97.8%), Ho-165 (2.24%)
Radioactive daughters: Dy-165
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.10485 [MeV]
Mean photon energy: 0.01917 [MeV]
Air kerma rate constant, Γ10: 7.476e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.476e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.680e-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-:
1.680e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.071e-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-165m 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-165m 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-165m 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-165m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36408e-05 |
4.698e-02 |
X-ray |
|
1.36934e-05 |
7.485e+00 |
X-ray |
|
1.22887e-03 |
1.461e-02 |
X-ray |
|
6.48150e-03 |
5.335e-02 |
X-ray |
|
7.25410e-03 |
6.013e-02 |
X-ray |
|
8.42365e-03 |
1.055e-02 |
X-ray |
|
4.52703e-02 |
2.612e-02 |
X-ray |
|
4.60801e-02 |
4.668e-02 |
X-ray |
|
1.08160e-01 |
3.008e-02 |
Gamma |
|
5.15467e-01 |
1.528e-02 |
Gamma |
|
2.90094e-01 |
1.826e-02 |
Beta |
|
1.81686e-05 |
4.072e-01 |
Auger electron |
|
1.28544e-04 |
3.417e+00 |
Auger electron |
|
1.34740e-04 |
2.139e-02 |
Auger electron |
|
1.52054e-04 |
1.702e-01 |
Auger electron |
|
2.13917e-04 |
5.480e-01 |
Auger electron |
|
5.95386e-04 |
6.703e-02 |
Auger electron |
|
1.01782e-03 |
1.211e+00 |
Auger electron |
|
1.19285e-03 |
6.575e-02 |
Auger electron |
|
5.15524e-03 |
4.199e-01 |
Auger electron |
|
6.41577e-03 |
1.479e-01 |
Auger electron |
|
7.70957e-03 |
1.312e-02 |
Auger electron |
|
5.42990e-02 |
9.673e-02 |
Conversion electron |
|
9.91475e-02 |
1.138e-02 |
Conversion electron |
|
9.95693e-02 |
3.422e-01 |
Conversion electron |
|
1.00379e-01 |
2.941e-01 |
Conversion electron |
|
1.06498e-01 |
1.638e-01 |
Conversion electron |
|
1.08160e-01 |
4.321e-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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