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Radionuclide Dosimetric Data Sheets
Strontium-85m
Summary data
General
Classification
Isotope: Sr-85m
Atomic number (Z): 38
Mass number (A): 85
Neutron number (N): 47
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 67.63 [m]
Decay constant: 1.7082e-04 [1/s]
Daughters: Sr-85 (86.6%), Rb-85 (13.4%)
Radioactive daughters: Sr-85
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.01296 [MeV]
Mean photon energy: 0.21773 [MeV]
Air kerma rate constant, Γ10: 1.053e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.053e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.076e-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-:
2.076e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.488e-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-85m 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-85m 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/Sr-85m 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/Sr-85m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52775e-05 |
1.264e+00 |
X-ray |
|
2.09647e-05 |
5.387e+00 |
X-ray |
|
1.32919e-02 |
2.394e-02 |
X-ray |
|
1.33539e-02 |
4.605e-02 |
X-ray |
|
1.51194e-01 |
1.286e-01 |
Gamma |
|
2.31860e-01 |
8.443e-01 |
Gamma |
|
1.26043e-05 |
3.706e-01 |
Auger electron |
|
1.36397e-05 |
1.493e+00 |
Auger electron |
|
5.23040e-05 |
3.466e-02 |
Auger electron |
|
6.50077e-05 |
3.714e-01 |
Auger electron |
|
7.35431e-05 |
1.500e-01 |
Auger electron |
|
7.47131e-05 |
1.500e+00 |
Auger electron |
|
9.55275e-05 |
6.599e-01 |
Auger electron |
|
1.06853e-04 |
3.030e-02 |
Auger electron |
|
1.09442e-04 |
7.239e-02 |
Auger electron |
|
1.48974e-03 |
1.401e-01 |
Auger electron |
|
1.56974e-03 |
6.487e-01 |
Auger electron |
|
1.61154e-03 |
1.135e-02 |
Auger electron |
|
1.70603e-03 |
5.695e-02 |
Auger electron |
|
4.90790e-03 |
2.538e-01 |
Conversion electron |
|
4.97760e-03 |
4.444e-01 |
Conversion electron |
|
6.65047e-03 |
1.461e-01 |
Conversion electron |
|
6.92000e-03 |
1.638e-02 |
Conversion electron |
|
1.14024e-02 |
3.051e-02 |
Auger electron |
|
1.30522e-02 |
1.001e-02 |
Auger electron |
|
2.15793e-01 |
1.670e-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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