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Radionuclide Dosimetric Data Sheets
Zirconium-85
Summary data
General
Classification
Isotope: Zr-85
Atomic number (Z): 40
Mass number (A): 85
Neutron number (N): 45
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 7.86 [m]
Decay constant: 1.4698e-03 [1/s]
Daughters: Y-85m (96.8%), Y-85 (3.16%)
Radioactive daughters: Y-85m, Y-85
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.32521 [MeV]
Mean photon energy: 1.47181 [MeV]
Air kerma rate constant, Γ10: 2.054e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.604e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.123e-13 [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-:
2.123e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.358e-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/Zr-85 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/Zr-85 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/Zr-85 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/Zr-85 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.29809e-06 |
1.151e+00 |
X-ray |
|
1.48403e-02 |
1.589e-02 |
X-ray |
|
1.49185e-02 |
3.044e-02 |
X-ray |
|
2.66300e-01 |
2.360e-02 |
Gamma |
|
3.58000e-01 |
1.118e-02 |
Gamma |
|
4.16300e-01 |
2.484e-01 |
Gamma |
|
4.54300e-01 |
4.140e-01 |
Gamma |
|
5.11000e-01 |
1.834e+00 |
Annihilation photon |
|
7.82100e-01 |
1.573e-02 |
Gamma |
|
1.19840e+00 |
4.430e-02 |
Gamma |
|
1.41020e+00 |
1.035e-02 |
Gamma |
|
1.76820e+00 |
1.780e-02 |
Gamma |
|
6.45164e-01 |
2.996e-02 |
Positron |
|
1.09768e+00 |
5.493e-02 |
Positron |
|
1.44733e+00 |
3.586e-01 |
Positron |
|
1.46533e+00 |
1.778e-01 |
Positron |
|
1.54583e+00 |
1.698e-02 |
Positron |
|
1.66314e+00 |
2.397e-01 |
Positron |
|
2.02940e-05 |
6.402e-01 |
Auger electron |
|
9.45889e-05 |
1.962e-01 |
Auger electron |
|
9.61387e-05 |
8.758e-02 |
Auger electron |
|
1.00785e-04 |
1.814e-02 |
Auger electron |
|
1.66230e-03 |
8.247e-02 |
Auger electron |
|
1.26657e-02 |
1.634e-02 |
Auger 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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