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Radionuclide Dosimetric Data Sheets
Strontium-85
Summary data
General
Classification
Isotope: Sr-85
Atomic number (Z): 38
Mass number (A): 85
Neutron number (N): 47
Radioactive decay
Decay modes: Electron capture
Half-life: 64.84 [d]
Decay constant: 1.2373e-07 [1/s]
Daughters: Rb-85 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0089 [MeV]
Mean photon energy: 0.50013 [MeV]
Air kerma rate constant, Γ10: 3.714e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.714e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.426e-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-:
1.426e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.013e-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/Sr-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/Sr-85 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/Sr-85 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52772e-05 |
9.074e+00 |
X-ray |
|
1.68753e-03 |
1.350e-02 |
X-ray |
|
1.32919e-02 |
1.712e-01 |
X-ray |
|
1.33539e-02 |
3.293e-01 |
X-ray |
|
1.49123e-02 |
2.454e-02 |
X-ray |
|
1.49217e-02 |
4.784e-02 |
X-ray |
|
5.14007e-01 |
9.571e-01 |
Gamma |
|
1.26043e-05 |
2.660e+00 |
Auger electron |
|
6.50120e-05 |
2.666e+00 |
Auger electron |
|
7.35403e-05 |
1.076e+00 |
Auger electron |
|
9.22990e-05 |
4.750e-02 |
Auger electron |
|
1.06997e-04 |
2.194e-01 |
Auger electron |
|
1.48980e-03 |
1.005e+00 |
Auger electron |
|
1.61164e-03 |
8.140e-02 |
Auger electron |
|
1.14024e-02 |
2.182e-01 |
Auger electron |
|
1.30522e-02 |
7.161e-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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