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Radionuclide Dosimetric Data Sheets
Strontium-87m
Summary data
General
Classification
Isotope: Sr-87m
Atomic number (Z): 38
Mass number (A): 87
Neutron number (N): 49
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 2.815 [h]
Decay constant: 6.8398e-05 [1/s]
Daughters: Rb-87 (0.3%), Sr-87 (99.7%)
Radioactive daughters: Rb-87
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.06724 [MeV]
Mean photon energy: 0.32016 [MeV]
Air kerma rate constant, Γ10: 1.493e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.493e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.077e-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-:
1.077e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.130e-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-87m 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-87m 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-87m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52773e-05 |
2.704e-02 |
X-ray |
|
2.09360e-05 |
1.464e+00 |
X-ray |
|
1.40549e-02 |
3.021e-02 |
X-ray |
|
1.41246e-02 |
5.801e-02 |
X-ray |
|
3.88531e-01 |
8.201e-01 |
Gamma |
|
1.36397e-05 |
4.080e-01 |
Auger electron |
|
7.49407e-05 |
4.071e-01 |
Auger electron |
|
9.39893e-05 |
1.727e-01 |
Auger electron |
|
1.00307e-04 |
3.686e-02 |
Auger electron |
|
1.09903e-04 |
1.973e-02 |
Auger electron |
|
1.57340e-03 |
1.704e-01 |
Auger electron |
|
1.71375e-03 |
1.515e-02 |
Auger electron |
|
1.20238e-02 |
3.453e-02 |
Auger electron |
|
1.37890e-02 |
1.170e-02 |
Auger electron |
|
3.72464e-01 |
1.501e-01 |
Conversion electron |
|
3.86331e-01 |
1.802e-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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