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Radionuclide Dosimetric Data Sheets
Rubidium-81
Summary data
General
Classification
Isotope: Rb-81
Atomic number (Z): 37
Mass number (A): 81
Neutron number (N): 44
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.576 [h]
Decay constant: 4.2076e-05 [1/s]
Daughters: Kr-81m (95.7%), Kr-81 (4.31%)
Radioactive daughters: Kr-81m, Kr-81
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.12223 [MeV]
Mean photon energy: 0.50813 [MeV]
Air kerma rate constant, Γ10: 2.309e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.364e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.958e-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-:
1.958e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.141e-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/Rb-81 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-81 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-81 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-81 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.93810e-05 |
4.940e+00 |
X-ray |
|
1.25517e-02 |
1.208e-01 |
X-ray |
|
1.26066e-02 |
2.330e-01 |
X-ray |
|
1.40649e-02 |
1.700e-02 |
X-ray |
|
1.40730e-02 |
3.315e-02 |
X-ray |
|
4.46150e-01 |
2.320e-01 |
Gamma |
|
4.56730e-01 |
3.016e-02 |
Gamma |
|
5.10430e-01 |
5.336e-02 |
Gamma |
|
5.11000e-01 |
5.448e-01 |
Annihilation photon |
|
5.37600e-01 |
2.227e-02 |
Gamma |
|
2.53071e-01 |
1.763e-02 |
Positron |
|
4.46695e-01 |
2.504e-01 |
Positron |
|
5.62901e-05 |
2.160e+00 |
Auger electron |
|
6.55323e-05 |
8.494e-01 |
Auger electron |
|
9.99379e-05 |
1.610e-01 |
Auger electron |
|
1.40735e-03 |
7.539e-01 |
Auger electron |
|
1.51224e-03 |
5.450e-02 |
Auger electron |
|
1.07980e-02 |
1.723e-01 |
Auger electron |
|
1.23371e-02 |
5.468e-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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