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Radionuclide Dosimetric Data Sheets
Rubidium-81m
Summary data
General
Classification
Isotope: Rb-81m
Atomic number (Z): 37
Mass number (A): 81
Neutron number (N): 44
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 30.5 [m]
Decay constant: 3.7877e-04 [1/s]
Daughters: Rb-81 (97.6%), Kr-81 (2.38%), Kr-81m (0.0214%)
Radioactive daughters: Rb-81, Kr-81, Kr-81m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08169 [MeV]
Mean photon energy: 0.03028 [MeV]
Air kerma rate constant, Γ10: 1.449e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.487e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.309e-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-:
1.309e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.851e-15
[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/Rb-81m 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/Rb-81m 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/Rb-81m 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/Rb-81m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52842e-05 |
7.947e+00 |
X-ray |
|
1.93804e-05 |
1.645e-01 |
X-ray |
|
1.68753e-03 |
1.179e-02 |
X-ray |
|
1.32919e-02 |
1.252e-01 |
X-ray |
|
1.33539e-02 |
2.408e-01 |
X-ray |
|
1.49123e-02 |
1.795e-02 |
X-ray |
|
1.49217e-02 |
3.499e-02 |
X-ray |
|
8.62600e-02 |
5.305e-02 |
Gamma |
|
5.11000e-01 |
1.991e-02 |
Annihilation photon |
|
1.26043e-05 |
2.327e+00 |
Auger electron |
|
5.62796e-05 |
7.195e-02 |
Auger electron |
|
6.49276e-05 |
2.338e+00 |
Auger electron |
|
6.55160e-05 |
2.827e-02 |
Auger electron |
|
7.35581e-05 |
9.501e-01 |
Auger electron |
|
9.21512e-05 |
4.159e-02 |
Auger electron |
|
1.01456e-04 |
1.500e-01 |
Auger electron |
|
1.40723e-03 |
2.517e-02 |
Auger electron |
|
1.48918e-03 |
8.949e-01 |
Auger electron |
|
1.60987e-03 |
7.225e-02 |
Auger electron |
|
1.14024e-02 |
1.596e-01 |
Auger electron |
|
1.30522e-02 |
5.237e-02 |
Auger electron |
|
7.11010e-02 |
6.410e-01 |
Conversion electron |
|
8.42120e-02 |
5.435e-02 |
Conversion electron |
|
8.43929e-02 |
8.814e-02 |
Conversion electron |
|
8.44549e-02 |
1.139e-01 |
Conversion electron |
|
8.60227e-02 |
4.413e-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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