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Radionuclide Dosimetric Data Sheets
Strontium-91
Summary data
General
Classification
Isotope: Sr-91
Atomic number (Z): 38
Mass number (A): 91
Neutron number (N): 53
Radioactive decay
Decay modes: β-
Half-life: 9.63 [h]
Decay constant: 1.9994e-05 [1/s]
Daughters: Y-91m (58.2%), Y-91 (41.8%)
Radioactive daughters: Y-91m, Y-91
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.65493 [MeV]
Mean photon energy: 0.70716 [MeV]
Air kerma rate constant, Γ10: 2.553e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.553e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.049e-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-:
1.049e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.133e-13
[Gy·kg/Bq·s]
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-91 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-91 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-91 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.29808e-06 |
1.381e-02 |
X-ray |
|
2.74700e-01 |
1.035e-02 |
Gamma |
|
6.20100e-01 |
1.775e-02 |
Gamma |
|
6.52300e-01 |
2.982e-02 |
Gamma |
|
6.52900e-01 |
8.040e-02 |
Gamma |
|
7.49800e-01 |
2.368e-01 |
Gamma |
|
9.25800e-01 |
3.852e-02 |
Gamma |
|
1.02430e+00 |
3.350e-01 |
Gamma |
|
1.57089e-01 |
1.497e-02 |
Beta |
|
2.09726e-01 |
2.104e-02 |
Beta |
|
4.08620e-01 |
3.520e-01 |
Beta |
|
4.23203e-01 |
1.851e-02 |
Beta |
|
5.28039e-01 |
2.539e-01 |
Beta |
|
8.23312e-01 |
3.439e-02 |
Beta |
|
1.13181e+00 |
2.893e-01 |
Beta |
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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